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Atari 8-Bit Computers: Frequently Asked Questions |
Section 3 of 11 - Prev - Next
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(2 on 5.25", 4 partitions on 3.5") with mixed Densities (S/E/D)
or standard 360kbytes (5.25") / 720kbytes (3.5"); can
theoretically read/write ST/PC 720k disks (software is missing!)
OS created by Stefan Dorndorf/Germany;
XF-Speedy--replaces the 8040 CPU with a 65C02 + ROM + Memory
------------------------------
Subject: 3.5) What other floppy disk drives can I use with my Atari?
Major contributors to this section: Glenn M. Saunders, Tomasz M. Tatar,
James Bradford, Konrad M. Kokoszkiewicz, Don Schoengarth, Andreas
Magenheimer
SS=Single-Sided SD=Single-Density, 90K/disk side
DS=Double-Sided ED=Enhanced-Density, 128K/disk side
DD=Double-Density, 180K/disk side
Printer port=has a standard DB25 parallel printer port,+ maybe a print buffer
Master=includes drive controller, can add additional,non-Atari-specific drives
Top transfer rate=19.2Kbps unless stated otherwise
Floppy disk drives designed for the 8-bit Atari computers:
Atari 810 SS SD
Atari 1050 SS SD/ED
Atari XF551 DS SD/ED/DD, 38.4Kbps burst mode
Access Unlimited ATAR88-1 SS SD master
Access Unlimited ATAR40-1 SS SD/DD master
Amdek AMDC I SS SD/DD uses flippy Amdisk III 3" disk/carts,printerport,master
Amdek AMDC II SS SD/DD dual drives, printer port, master
AS SN-360 DS SD/ED/DD
Astra 1620 SS SD/DD dual drives
Astra 2001 SS SD/DD dual drives
Astra Big-D DS SD/DD dual drives
Astra The One DS SD/DD, printer port
B&C 810 SS SD, optional Happy Warp Speed 52Kbps
Concorde C-221M SS SD/DD master
Concorde C-222M DS SD/DD master
CSS Floppy Board, for the Black Box, master, support PC 720K and 1.44MB 3.5"
drives, support PC 1.2MB and 360kB 5.25" drives,
also read/write 5.25" and 3.5" MS-DOS disks
see: http://www.nleaudio.com/css/products/floppy.htm
High-Density Disk Interface (HDI) a PCB master,connect up to 4 standard drives
Indus GT SS SD/ED/DD, Synchromesh mode usable with SpartaDOS X
and DOS XL only. 72Kbps under SpartaDOS X, 37Kbps under DOS XL. Z-80 cpu
RAM-Charger--expansion card contains 64K RAM + software, for CP/M support
KARIN MAXI DS SD/ED/DD/QD
L.E. Systems LEDS5-01 SS SD/DD master, 134.4Kbps, 800 only
CP/M expansion: 4MHz Z80, 64K RAM
L.E. Systems LEFDC-04 SS SD Four drives, copies a disk in 22 secs, 800 only
L.E. Systems LEFDC-08 SS SD Eight drives, copies a disk in 22 secs, 800 only
LDW Super 2000 SS SD/DD, 19.2Kbps or 67Kbps
image: http://romualdl.multimania.com/images/atari/super2000.jpg
LDW CA2001 SS SD/DD, 19.2Kbps or 38.4Kbps "California Access"
image: http://romualdl.multimania.com/images/atari/ca2001.jpg
LDW CA2002 DS SD/ED/DD,19.2Kbps,70Kbps w/SpartaDOS. "Calif. Access"
Micro MainFrame MF-1681 SS SD/DD, printer port, 4K to 54K printer buffer,
hard disk firmware included, master, Z-80 CPU w/ 16K to 64K RAM for CP/M,
TRSDOS, MaxiDOS A, and OASIS. see: http://www.qnet.com/~dons/mmf.html
Micro MainFrame MF-1682 dual drives version of MF-1681
Percom RFD40-S1 SS SD/DD, master
Percom RFD40-S2 SS SD/DD dual drives, master
Percom RFD44-S1 DS SD/DD, master
Percom RFD44-S2 DS SD/DD dual drives, master
(80-track RFDs hinted at http://www.atarimagazines.com/v1n2/newproducts.html)
Percom AT88 SS SD, master
Percom AT88-S1 PD SS SD/DD, printer port, master
Percom AT88-S2 PD SS SD/DD dual drives, printer port, master
Rana 1000 SS SD/ED/DD, stand alone disk formatting
RCP 810 SS SD
San Jose Computer Special Edition 810 SS SD, optional Happy Warp Speed 52Kbps
SWP ATR8000 4MHz Z80, 16K RAM, RS232, master, printer port
or 4MHz Z80, 64K RAM, RS232, master, printer port, CP/M 2.2
options: 128K or 256K CO-POWER-88 with MS-DOS; CP/M-86
TOMS 720 DS SD/ED/ID/DD/QD/ID printer port, MYDOS 4.50 on ROM, 70Kbps
- SS/SD - 40 tracks, 18 sects, 128 bytes = 90 KB
- SS/ED - 40 tracks, 26 sects, 128 bytes = 130 KB
- SS/ED - 40 tracks, 18 sects, 256 bytes = 180 KB
- SS/ID - IBM S-9 - 40 tracks, 9 sects, 512 bytes = 180 KB
- DS/DD - 40 tracks, 18 sects, 256 bytes = 360 KB
- DS/QD - 80 tracks, 18 sects, 256 bytes = 720 KB
- DS/ID - IBM D-9 - 40 tracks, 9 sects, 512 bytes = 360 KB
- known as Toms-Turbo Drive, Turbo format and speeder is compatible
with german Engl-Turbo-1050; (tools will work with both drives);
TOMS 710 DS SD/ED/ID/DD/QD/ID printer port, MYDOS 4.50 on ROM, 67Kbps
one more format: double sided, 80 tracks, IBM (720 KB)
also TOMS Navigator on ROM (like Norton Commander);
known as Toms-Turbo drive; Turbo format and speeder is compatible
with german Engl-Turbo-1050; (tools will also work with both drives);
Trak AT-1 SS SD/DD master.upgrade: printer port+4K/16K buffer
Trak AT-D1 SS SD master, printer port, 4K print buffer.upgrade:16K
Trak AT-D2 SS SD/DD master, printer port, 4K printbuffer.upgrade:16K
Trak AT-D4 DS SD/DD, printer port, print buffer
Trak Champ SS SD master
Trak Champ2 SS SD/DD master
Trak AT-S1 SS SD/DD slave
XFD601B DS SD/ED/DD 70kbps,Top Drive,Synchromesh,UltraSpeed,XF551 compat.
XFD602B dual DS SD/ED/DD 70kbps,Top Drive,Synchromesh,UltraSpeed,XF551 compat
While any standard "slave" drive will work with "master" drives listed above,
the following are slave drives marketed specifically to Atari users:
Access Unlimited ATAR88-A1 SS SD slave
Access Unlimited ATAR40-A1 SS SD/DD slave
Concorde C-221S SS SD/DD slave
Concorde C-222S DS SD/DD slave
Percom RFD40-A1 SS SD/DD slave
Percom AT88-A1 SS SD/DD slave
RCP 100 DS SD/DD, slave
RCP 200 DS SD/DD dual drives, slave
------------------------------
Subject: 3.6) What kinds of 5.25" floppy disks can I use with my Atari drives?
Russ Gilbert writes:
If you're talking standard computer store, you can't use those 5 1/4" disks. I
mean you can't use high density disks. They must be double density to use
with the 1050. Almost all double density 5 1/4" disks have a hub ring, high
density disks don't have the hub ring.
RHamiIton5 elaborates: (5/12/01)
The Atari 8 drives do not have write heads and circuity which can handle the
type of oxide coating used on the high density floppy media; they cannot write
reliably to them. The hub ring has just become a sort of marker to distinguish
the high density from the standard double density diskettes.
Way back in your apple days of '79-'82, most disks were hubless and only the
really premium brands offered hubs to prevent slippage and out of round
problems; you could even buy little kits for adding you own hub rings.
When the home computer swell really hit around '83 and price wars began, hub
rings became common on good disks and eventually became standard down to
include most generic bargain diskettes.
The introduction of high density 5.25's required a different coercivity (=
magnetizability) to get more bits in a smaller space and suitable electronics
to do it. These disks were produced hubless; was it a differentiating label or
just unnecessary because of stronger mylar construction? Anyone?
------------------------------
Subject: 3.7) What can I do to extend the life of my floppy disks?
Lee Hart writes (January 2004):
Personally, I have several hundred floppy disks for my Atari 800, Kaypro
4, Heathkit H89, and IMSAI 8080 computers that are 10-20 years old. What
I can say in general:
- Most disks stored in plastic boxes or ziplock baggies survived.
- Most disks stored in cardboard boxes or just their sleeves
did NOT survive.
- Some brands lasted better than others, but I haven't collated the
information so as to make any kind of definitive statements.
- If a disk cannot be read, CLEAN THE DISK DRIVE HEAD before attempting
to read another disk! Otherwise, crap from the bad disk will remain
on the head, and will scar and destroy any SUBSEQUENT disk you put
in the drive! (the voice of painful experience).
- For lack of a better plan, for each of my surviving disks I am:
a. reformatting another blank disk
b. copying the data from an old disk onto the blank disk
Then I have a more recently-produced backup disk in case the
original disk later fails.
------------------------------
Subject: 3.8) How can I use a hard drive with my 8-bit Atari?
Atari never produced hard drives for the 8-bit Atari, but a variety of options
have been produced over the years. No common DOS version was written with
drives the size of hard drives in mind, and very few 8-bit Atari users have
owned hard drives for the Atari. Yet, if you're serious about it, a hard
drive can make a tremendous addition to your system!
A couple of these options are hard drives designed specifically for the 8-bit
Atari computers; the rest are interfaces designed to let you attach an
industry standard SASI, SCSI, or IDE type hard drive. Customized software
(OS, DOS) is often involved as well.
Larry White contributed to some of these descriptions.
Additional Corvus info from an eBay auction by Ben Corr, 7/03.
==> Corvus hard drive (5MB, 10MB, or 20MB)
Attaches via joystick ports 3 & 4 on the Atari 800 only.
-- Corvus Integrator Board - alows access to the Corvus Disc without the
Corvus software, so that any DOS that uses standard SIO calls will work.
-- Corvus Multiplexer - used to network up to 8 Ataris to one Corvus Drive
- Corvus Mirror card - back up the drive's contents onto video tape
==> SupraDrive Atari Hard Disk, by Supra, later K-Products. 10MB or 20MB.
includes external Hard Disk Interface
Some limitations on drive type and size and total number of drives in sys.
Attaches via PBI, or ECI with adapter.
See: http://www.atarimagazines.com/v5n6/Supradrivefor8Bit.html
Maybe still available from Bob Klaas?
==> BTL Hard Disk System
BTL 2001 Connector for 600XL/800XL PBI
BTL 2002 Connector for 130XE/800XE/65XE ECI
BTL 2004 SASI Hard Disk Adapter
See: http://www.atarimagazines.com/v5n12/BTLHardDisk.html
==> Multi I/O (MIO) interface, by ICD. Includes:
- Parallel printer interface
- Serial interface, for modem or serial printer. will handle 19.2Kbps
- 256K or 1 MB RAM, for RAMdisk or printer spooler
- SASI/SCSI interface, supports up to 8 controllers.
Limited to drives with 256-byte sectors.
Attaches via PBI, or ECI with adapter.
==> CSS Black Box interface
RS-232 Serial Modem Port (19.2Kbps) w/ hardware flow control,
Parallel Printer Port,SASI/SCSI Hard Disk Port, Operating System Enhancements,
optional 64K printer buffer. Supports drives with 512-byte sectors.
PBI/ECI device. Available: http://www.nleaudio.com/css/products/black.htm
==> SmartIDE project by Bob Woolley
Uses 256 of the normal 512 byte sectors. Point-to-point wiring project.
Articles and software at http://www.wolfpup.net/atari/atari.html
==> IDE Hard Drive Interface 1.0
By Konrad M. Kokoszkiewicz (Draco) and Jacek Zuk
PBI device. Logical sector length: 256 or 512 bytes
Availability???
==> Fine Tooned Engineering (FTe) Multi I/O II (MIO II) interface
An IDE interface. Several exist, but it was never really released
==> msc-IDE Controller
created by Steve Birmanns and Matthias Belitz
* real device for the parallel-port (PBI/ECI) of the Atari XL/XE
* up to 240 partitions per harddisk supported
* emulates D1: until D9: of disk devices (access to 9 partitions at one time)
* full bootable from any partition (with standard XL-OS)
* write protectition capability
* supports master/slave configuration
* more than 30 KB/s file access with SPARTA-DOS 3.2 gx (reading)
* more than 10 KB/s file access with SPARTA-DOS 3.2 gx (writing)
* software partially supports CD-ROM and ZIP drives.
Sold out.
http://www.birmanns.de/atari/
==> Gary Morton's BadSector"A" Project
Wants to connect his IDE drive to the SIO bus.
http://www.alma.demon.co.uk/Atari/AtariProjects.html
==> MyIDE interface and software by Mr.Atari, Sijmen Schouten
Point-to-point wiring project. Different units for 800 and XL, including a
cartridge version for the XL.
http://home.wanadoo.nl/mr.atari/
==> SIO2IDE, by Marek Mikolajewski (MMSoft)
The SIO2IDE is a simple interface that allows you to attach any IDE Disk
Drive to your 8-bit Atari computer. Latest interface version has the
following main features:
* ATARI side:
- uses standard Atari SIO at a speed of 19200 baud
- works with Atari High Speed SIO (US and Happy) at a speed of 52000 baud
- emulates Atari disks D1: to D8:
- can be used with any Atari DOS and OS
- can be used without any problems with other SIO devices (disk drivers,
printers, modems, SIO2PC, second SIO2IDE etc)
- can be easy installed inside your Atari with 2.5' laptop HD
- is easy to configure via special fdisk.com utility software
(changing disks sequence and active directory)
* IDE device side:
- all IDE ATA/ATAPI devices can be used: Disk Drives (2.5' and 3.5'),
CD-ROMs, Compact Flash cards etc.
- supports PC file systems, FAT16 and FAT32
- supports CD file system, ISO9660
- supports ATR disk images (SD, DD up to 16MB)
- supports directory change (multiconfig)
- is easy to configure, many text configuration files (sio2ide.cfg) can
be stored in different directories
- disk configuration can be checked by special checkfs.exe PC utility
NOTE: checkfs.exe does NOT work with HDD connected via USB port
- standard disk utilities can be used (defrag.exe, scandisk.exe etc)
* USB port side:
- interface works as Mass Storage Class device (removable drive)
- no drivers are needed for Windows 2K, ME, XP
- driver for Win98 is included in this SIO2IDE package
http://www.atari.cuprum.com.pl/sio2ide.htm
==> Nathan Hartwell's IDE projects
http://www.magelair.com/
------------------------------
Subject: 4.1) What are the Atari 820, 822, and 825 Printers?
The following printers were produced by Atari and styled to match the 400/800
computers.
Atari 820 Printer:
- 40-column impact printer
- 5x7 dot matrix
- 40 characters per line, upper & lower case alpha
- horizontal and vertical alphanumeric characters
- 6507 microprocessor, 6532 RAM I/O chip, 2K ROM
- 40 characters per second
- uses Standard Roll Paper/adding machine paper
Atari 822 Thermal Printer: ( = Trendcom Model 100 )
- 37 characters per second
- 10 characters per inch
- 40 characters per line, upper/lower case and point graphics
- 5x7 dot matrix
Atari 825 80-Column Printer ( = Centronics 737 )
- 3 character sets:
monospaced 7x8 dot matrix at 10 characters per inch
monospaced condensed at 16.7 cpi
proportionately spaced Nx9 dot matrix at avg of 14 cpi (N=6..18)
- all characters can be elongated (printer double width)
- characters per line: 80 at 10 cpi; 132 at 16.7 cpi
- speed: 50 cps at 10 cpi; 83 cps at 16.7 cpi; 79 cps avg. proportional
- print buffer: 1200 dot columns
- paper: roll, fanfold, or cut sheets
- requires Atari 850 Interface Module or equivalent
------------------------------
Subject: 4.2) What are the Atari 1020, 1025, 1027, and 1029 Printers?
The following printers were produced by Atari and styled to match the XL
series computers.
Atari 1020 Color Printer:
( = Commodore 1520 / Oric MCP40 / Tandy/Radio Shack CGP-115 /..; made by ALPS)
- 4-color graphics: (black, red, blue, green). optional 8-pen rainbow package
- alphanumberics and X,Y plotting capability
- 10 cps (40-column mode)
- 20, 40 and 80-column modes
- horizontal and vertical alphanumerics, English and International chr sets
- water soluble ink pen technology
- 4-pen barrel print head
- microprocessor
- paper: standard roll paper (40 column width)
- AtariGraphics cassette software included
Atari 1025 80-Column Printer: ( = Okidata ML80 )
- 40 cps (80-column 10 cpi mode)
- 5 cpi expanded (40 col), 10 cpi (80 col), 16.7 cpi condensed (132-col)
- 5x7 character dot matrix
- buffer: 132 chrs at 16.7 cpi, 80 chrs at 10 cpi
- paper: roll,fanfold,single sheets. optional:roll paper holder, tractor feed
Atari 1027 Letter Quality Printer: ( = Mannesmann Tally Riteman LQ.)
- fully formed characters, prestige elite 12)
- 12 characters per inch (80 columns)
- 20 characters per second
- single sheets or roll paper
Atari 1029 Programmable Printer ( by Seikosha)
- 7-pin dot matrix, same as Commodore MPS-801
- Released for Europe & Canada (not USA)
- Rich_N_Feymus says:
I think its a SEIKOSHA GP500, but not 100% sure. However, the
Commodore MPS-801 ribbons should be much easier to find.
- The Tandy DMP 110 is another model reported to be the same as the 1029.
------------------------------
Subject: 4.3) What are the Atari XMM801 and XDM121 Printers?
The following printers were produced by Atari and styled to match the XE
series computers.
Atari XMM801 Printer: ( = SHINWA CP80 )
- 80 columns, dot matrix
- friction feed or pin feed
- pica 10 cpi, double width pica 5 cpi, elite 12 cpi,double width elite 6 cpi,
condensed 16.5 cpi, double width condensed 8.25 cpi
- Ribbon: Commodore 1526 and the Mannesman-Tally Spirit 80
Atari XDM121 Printer:
- 80 column, daisy wheel--letter quality
- underlining, subscripts, superscripts
- friction feed paper
- Ribbon: Silver Reed CF130, Olivetti ET201,ET221,Nu-Kote NK136
------------------------------
Subject: 4.4) What other printers can I use with my Atari?
Some third-party printers were marketed for use with the Atari 8-bit
computers:
Alphacom 42 + Atari interface cartridge
- requires 850 Interface or equivalent
- thermal
- 4 1/2" width paper
- supports complete ATASCII character set
Axiom AT-100 / Seikosha AT-100 / Seikosha GP-100A Graphic Printer
- built-in Atari interface, cable and connector, 2nd SIO port for daisy-chain
- dot matrix
- early model 30-cps, later version 50 cps
- Graph-AX graphics software package
Axiom GP-550AT (by Seikosha)
- built-in Atari interface, cable and connector, 2nd SIO port
- dot matrix
- 86 cps draft, 43 cps NLQ
- Graph-AX graphics software package
Axiom GP-700AT (by Seikosha)
- built-in Atari interface, cable and connector, 2nd SIO port
- 4 hammer print heads, 4-color ribbon cartridge
- 25 colors
- 50 cps
- Graph-AX graphics software package
Epson HomeWriter 10
- plug-in cartridge interface for the Atari
- 80 column dot-matrix printer
- draft quality printing at 100 cps and near letter quality at 16 cps
General Electric GE 3-8100 / TXP 1000
- GE Printer Interface Module for Atari
- dot-matrix
- 50 cps draft, 25 cps NLQ
Okidata Okimate 10 Personal Color Printer
- available Plug 'n Print Interface for Atari
- a thermal printer.
- single-sheet or tractor-feed paper.
- 26 colors
- 240 words per minutes
Beyond the above printer models, most any "industry-standard" line printer can
work well with the Atari. For many years, most printers marketed for home use
could be classified into one of two categories: parallel or serial interface.
Parallel line printers are much more commonly used than serial line printers,
with the Epson MX/FX/LX series defining the market.
The most common way to use an industry standard printer with the Atari has
been to attach it through the 15-pin 8-bit parallel port of the Atari 850
Interface Module or equivalent (such as the ICD P:R: Connection). One gotcha
here is that the 850's parallel port is DB15, where the PC world ended-up
standardizing on a DB25 configuration. So you need to find or build a cable
that provides the DB15 connector for the Atari end (and Centronics-type
parallel connector on the printer end) when attaching a standard parallel
printer to the Atari through an Atari 850 or equivalent.
Many 3rd-party disk drives for the Atari (along with the XEP80 Interface
Module) do include a DB25 parallel printer port, rendering the need for an
Atari-specific printer cable unnecessary.
The Atari 850 Interface Module and equivalents also provide standard DB9
serial RS232C ports, permitting use of standard serial line printers with the
Atari. But this is much less common than parallel, both in the Atari world
and in the industry at large.
Some folks have connected more modern inkjet and laser printers with parallel
connections to the 8-bit Atari with success. Graphics printouts from the
Atari may be less than ideal (look for a printer with an Epson MX/FX/LX
printer series emulation mode), but these types of printers should work fine
for plain text output if they can handle simple line print jobs. Anyone want
to contribute their experiences to be included here?
Bob Woolley wrote on Sun, 14 Apr 2002:
I use HP LaserJet 4Ps on my Ataris. They are one of the last front panel
selectable cheap printers - from which you can select your default fonts,
etc. The newer laser printers can only set fonts and operating modes thru
the interface, not impossible, but not as easy as selecting on the panel.
This does allow you to print just about any point size of the internal
fonts in the printer on your Atari.
Either way, you really have to do a little work to get properly formatted
output from a word processor. I have managed to use the proportional font
setting with AtariWriter and printer driver creation utilities to get good
results.
Mathy van Nisselroy provides an AtariWriter printer driver for the HP LaserJet
here: http://www-users.rwth-aachen.de/mathy.van_nisselroy/stuff.htm
Modern printers designed for home markets now tend to provide USB connectors.
------------------------------
Subject: 5.1) What are the Atari 830, 835, 1030, XM301, and SX212 Modems?
A MODulator/DEModulator translates digital information from your computer into
acoustic tones that can be sent and received, from modem to modem, via
standard telephone lines.
Atari produced several modems for use with the 8-bit Atari computers:
Atari 830 Acoustic Modem: ( = Novation 'CAT' )
- a stand-alone, acoustically coupled, frequency shift keying (FSK) modem
- up to 300 bits per second
- Bell 103/113 modem compatible
- requires Atari 850 Interface Module or equivalent
Atari 835 Direct Connect Modem:
- 300 bps
- Bell 103/113 modem compatible
Atari 1030 Direct Connect Modem:
- 300 bps
- Bell 103/113 modem compatible
- built-in ModemLink software.
- 2 SIO ports
Atari XM301 Modem:
- 300 bps
- Bell 103/113 modem compatible
- with XE Term disk software
- permanent SIO cable, must be at end of SIO chain
- draws its power from the computer via SIO
Atari SX212 Modem:
- SIO & DB25 RS232 serial ports, must be at end of SIO chain
- 1200 baud
- Bell 103/113/212A modem compatible
- rarely with SX-Express! disk software.
------------------------------
Subject: 5.2) What other modems can I use with my Atari?
Some third-party modems were marketed for use with the Atari 8-bit
computers:
==> Microconnection, by Microperipheral Corp.
300 bps, Bell 103 compatible, T-SMART software, pulse dialing (not touch tone)
Four versions:
buss-decoding version does not require 850 Interface or equivalent, includes
DB25 parallel printer interface, with or without autodial
Plain version requires 850 Interface or equivalent, with or without autodial
and autoanswer
==> MPP-1000C, by Microbits Peripheral Products
300 baud, joystick port 2, Smart Terminal cartridge
==> MPP-1000E, by Microbits Peripheral Products
300 baud, joystick port 2, Smart Term software
From: "Steven J Tucker" Sun, 13 Jan 2002 16:14:38 -0500
The 1000E..had this strange problem in that it could never hang up the phone
==> MPP-1200A, by Microbits Peripheral Products
Released? Vaporware?
1200 bps, joystick port 2
==> 300 AT, by Supra (same as MPP-1000E)
300 baud, joystick port 2, Smart Term software
==> 1200 AT, by Supra
1200 baud, Hayes compatible, connects to SIO via SupraVerter/R-Verter cable,
Smart Terminal software
==> Volksmodem, by Anchor Automation
300 baud, 'F' Cable permits connection to joystick port 2
==> Q-MODEM, by Quantum Microsystems
300 baud, two SIO connectors, QuanTerm disk or cartridge
Beyond the above modem models, most any "industry-standard" external serial
modem can work well with the Atari. These have been commonly sold for PCs for
many years. The Hayes Smartmodem more or less defined the market for these,
initially.
One common way to use an industry standard external serial modem with the
Atari is to connect it to the SIO port via an Advanced Interface Devices
(A.I.D., later Supra) R-Verter Serial Bus Modem Adapter cable, or
equivalent.
The other common way to use an industry standard external serial modem with
the Atari is to attach it through the 9-pin RS232C serial port of the Atari
850 Interface Module or equivalent (such as the ICD P:R: Connection). One
gotcha here is that the serial port on the 850 is DB9 female, where the PC
world ended up standardizing on a DB9 male connector for this purpose. But
gender converters are readily available.
For using modems at speeds of 2400 bps and up with the Atari, it will be
useful to have an understanding of data flow control. Here is a definition
of flow control from www.modems.com:
Often, one modem in a connection is capable of sending data much faster than
the other can receive. Flow control allows the receiving modem to tell the
other to pause while it catches up. Flow control exists as either software,
or XON/XOFF, flow control, or hardware (RTS/CTS) flow control. With software
flow control, when a modem needs to tell the other to pause, it sends a
certain character, usually Control-S. When it is ready to resume, it sends a
different character, such as Control-Q. Software flow control's only
advantage is that it can use a serial cable with only three wires. Since
software flow control regulates transmissions by sending certain characters,
line noise could generate the character commanding a pause, thus hanging the
transfer until the proper character (such as Control-Q) is sent. Also,
binary files must never be sent using software flow control, as binary files
can contain the control characters. Hardware, or RTS/CTS, flow control uses
wires in the modem cable or, in the case of internal modems, hardware in the
modem. This is faster and much more reliable than software flow control.
Some 2400 bps modems, and probably all modems with 9600 bps speed capabilities
and up, normally use V.42 standard error correction and V.42bis standard data
compression. But V.42 requires either software or hardware flow control, and
V.42bis requires hardware flow control (and V.42 error correction).
Hardware flow control is not available with the Atari 850's serial ports.
As a result, just before dialing out with your Atari telecom software, it's
usually desirable, if not necessary, to disable your modem's flow control.
The Hayes modem command to disable flow control looks like:
AT&K0
The top speed of the Atari 850's serial ports is 9600 bps.
Clay Halliwell offers a tip on utilizing 9600 bps through the 850 Interface:
On 11 Feb 1996, Marc G. Frank said:
> I'm having problems getting a modem attached to my Atari 850 to
> communicate at 9600 baud. When I set my communications program to 2400
> baud, everything works fine. However, when I set it to 9600 baud, the
> modem echoes my characters but doesn't act on them. That is, at 2400,
The problem with the 850 is that some of them (like mine) don't produce a
PERFECT 9600 baud signal. As a result modems can't train on it, and while
they will echo characters back, for some nitpicky reason they won't pick up
on the "AT" attention code.
The solution is to do all your dialing at 2400 baud, but set the S37
register to force the modem to try to connect at 9600. Then switch your
Atari to 9600 after connecting.
Through the use of an ICD MIO or a CSS Black Box, it is possible to utilize
modems at speeds up to 14.4 Kbps (V.32bis) at full speed with no loss of data.
The serial R: device handler for the Black Box supports hardware flow control
natively. Optional for the Black Box, but essential for the MIO, is the
HyperSpeed handler by Len Spencer.
Hyperspd.arc is available at http://members.aol.com/lenspencer/atari8.htm
------------------------------
Subject: 6.1) What is the Atari 850 Interface Module?
While the Atari's SIO and controller ports did not conform to established
industry standards, Atari produced the 850 Interface Module to address this
issue. The 850 connects to the SIO port on the Atari, and provides:
- four 9-pin serial EIA RS232C ports
- One 15-pin 8-bit parallel Centronics-type port
Many "industry standard" (of the time) printers, modems, and various other
devices can be used with the Atari computer in combination with an 850
Interface Module.
Early 850's are in an all metal (black) case, but most are in a plastic beige
case matching the 400/800 computers. Other features:
- programmable baud rate on any port, including:
75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, and 9600 bps;
baudot speeds of 60, 66, 75, 100 words per minute
- uses standard ASCII. Baudot support for radio-teletype (RTTY).
PINOUTS
850 R1: Serial port DB9P:
5 4 3 2 1 ____________________________
9 8 7 6 / DB25P
1. DTR - Data Terminal Ready (out) + 20
2. CRX - Signal (carrier) Detect (in) + 8
3. XMT - Transmitted Data (out) + 2
4. RCV - Received Data (in) + 3
5. GND - Signal Ground + 7
6. DSR - Data Set Ready (in) + 6
7. RTS - Request to Send (out) + 4
8. CTS - Clear to Send (in) + 5
No connection to shield + Frame - to the shield wire
850 R2: Serial port DB9P:
5 4 3 2 1
9 8 7 6
1. DTR
3. Send Data
4. Receive Data
5. Signal Ground
6. DSR
850 R3: Serial port DB9P:
5 4 3 2 1
9 8 7 6
1. DTR
3. Send Data
4. Receive
5. Signal Ground
7. RTS
8. -8 Volts
850 R4: Serial port DB9P:
5 4 3 2 1
9 8 7 6
1. Send Data +
3. Send Data -
7. Receive Data +
9. Receive Data - (20 mA)
850 P: Parallel port DB15P:
8 7 6 5 4 3 2 1 ____________________________
15 14 13 12 11 10 9 / 36 pin Centronics (male)
1. Data Strobe + 1
2. D0 + 2
3. D1 + 3
4. D2 + 4
5. D3 + 5
6. D4 + 6
7. D5 + 7
8. D6 + 8
9. Data Pull up (+5v) +
10. - +
11. Ground + 16
12. Fault + 32
13. Busy + 11
14. - +
15. D7 + 9
No connection to shield + Frame - to the shield wire
Because the 850 was relatively expensive, provided more capabilities than the
average user was looking for, and was at times unavailable from Atari despite
high demand, there were many 3rd-party interfaces designed to provide some
compatible subset of the 850's features. Perhaps the most prominent example
of such a product is the P:R: Connection from ICD.
------------------------------
Subject: 6.2) What is the Atari XEP80 Interface Module?
This text written by Thomas Raukamp.
Since the development of the Atari 8-bit line of computers in 1979, users
wanted better text displays than the default 40x24. There has been some
attempts to satisfy this need, like the Austin-Franklin board or the Ace
80/80xl cartridge. For more informations about these modifications read The
Atari 8-bit Hardware Upgrade FAQ from David A. Paterson.
The Atari XEP80 Interface Module is Atari's entry to the 80 column field. It
lets a XL, XE, 400 or 800 computer system display a full 80 columns across
your monitor screen. The XEP80 provides a 256-character wide by 25-line
display window. Up to 80 characters are displayed horizontally at once, and
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