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--------------------------------- part 4 of 4 ------------------------------

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Section 9: Technical Details

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Q9.1) How do I get a faster interrupt timer than the centisecond ones?

For this you require the use of IOC Timer 1, a 2MHz timer unused by RISC OS and claimable by code for use. Details of how to program the timer are available in the IOC datasheets, or you could look for various PD utilities like TimerCtrl that handle the timer for you.

I am informed that the Acorn TimeCode system now lays claim to Timer 1 and that software using it is deprecated.

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Q9.2) How can I create Interlaced GIFs on Acorn machines?

Four utilities exist to let you create these.

spr2gif will take a sprite and convert it to a gif file. It will interlace and render transparent the gif as well. For the transparency it uses the colour of the first masked pixel it encounters in the sprite - suitable for automated gif image creating. (No need to twiddle with specifying transparency colours.)

WebGIF allows you to add transparency and interlacing to your GIFs as well.

Creator, from about v2.00, can create interlaced GIFs. However you have to specify the transparency colour directly.

And finally InterGIF not only can create interlaced, transparent GIFs but is capable of creating animated ones as well.

On top of these utilities an increasing number of commercial programs can create Interlaced GIFs, Photodesk being a prime example.


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Section 10: Risc PC PC Card Details

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When reading this section it must be remembered that all references to the Emulator software featured in this section are to the Risc PC PC Second Processor Card controlling software, and not to the older Software PC Emulator software released by Acorn.

Q10.1) What is the latest version of the Emulator software?

The latest, publicly released for all PC card owners, full version is 3.06 and it is available from the Aleph1 FTP & Web site. (http://www.aleph1.co.uk/) Features include memory up to 32Mb, fully redefinable 256 colour modes and the addition of directly accessed SCSI drives.

The very latest version of the software (v3.03) has been released commercially as PCPro. This features SA compatibility, speed enhancements, VESA video drivers, a debugged shared memory system for faster operation, improved support for Windows 95, DirectX drivers and a variety of other enhancements. Details of this software can be found on the Aleph1 web site.

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Q10.2) Why does the serial port not work after using the card?

With v1.87 of the controlling software if you choose 'Direct Serial', to enable the serial port under the emulator, and then quit the emulator it doesn't correctly release the serial port back to RISC OS. However a temporary patch is to uncomment the very last line of the !PC486.!Run file.

Run .!RunImage 
|uncomment the next line if you need to use the serial port after using !PC 
| RMreinit SerialDeviceDriver

Namely uncomment the RMreinit SerialDeviceDriver so that the above looks more like this. 

Run .!RunImage 
|uncomment the next line if you need to use the serial port after using !PC 
RMreinit SerialDeviceDriver

Then you should find control of the serial port returned to RISC OS after you have finished with the emulator. As of v1.91 this has been fixed and the serial port will be released properly. The latest version can be obtained from the Aleph1 FTP site.

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Q10.3) Why do Windows programs give me incorrect colours in a 256 colour mode?

This can happen if you forgot to put a 'p' after colour descriptor in your Windows mode definition string. For example to configure the emulator to give windows a 1024x768 screen mode at 256 colours with fully programmable colours your string should look like this:-

x1024y768c256p 

Note the p at the end of the line.

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Q10.4) How much memory can I configure for the PC Emulator?

Up to v1.86 of the software the upper limit was 16 MB of memory. As of v1.87 that has been raised up to 32 MB of memory. However, for some odd reason, after 16 MB of memory the memory can be only configured in 4 MB chunks. Consequently the possible values go 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,20,24,28 & 32 MB.

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Q10.5) Can I use Win95 with the card?

Yes, however the installation of it is slightly more complicated than (should be) normal for a PC. Choose a custom setup and inform the Win95 installer of what hardware you have present, under the Video driver section install the default VGA driver.

Then complete the install. Once it is installed you may then install the Arm video driver in a similar fashion as for the instructions for installing it under Windows 3.11. There are specific Windows 95 instructions for ARMDRV v1.99, this version also cures the occasional icon redraw problem with Windows95. You should then be away.

With PCPro specific Win95 installation files and instructions are provided for both the Windows video driver as well as the Sound Blaster emulation. Not to mention general instructions for installing Windows 95.

Win98 should work on 586 cards, but I've heard that it won't work on 486 cards.

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Q10.6) Can I resize my PC partition?

Yes, this is possible. However the procedure is extremely risky and should not be attempted if you cannot afford to lose the contents of your partition. Ensure that you either have a backup of the partition or are prepared to possibly have to reinstall everything.

First off run Defrag on your PC to collect all the files towards the start of the partition. This is best done from DOS, doing it from within Windows 95 most likely means that the shutdown procedure will scatter a few files about potentially causing problems for resizing.

Secondly use this BASIC program to change the size of the partition under RISC OS.

REM Resize parition file.
chan=OPENUP("Drive_C")
EXT#chan=
CLOSE#chan

Change the filename to suit the name of your PC partition and adjust the size in bytes to the new size of your partition. Increasing the size of the partition is safe, but when shrinking the partition care must be taken to not shrink the partition below the size of the actual files contained within it.

Finally once the partition size has been adjusted boot up your PC and run the program PRESIZER.EXE. This is a DOS partition resizer and should allow you to now adjust the partition table and FAT to the new size of your partition.

N.B. It must be stressed again that this is a very risky operation and could easily result in total data loss of your partition. Also the procedure has only been attempted for increasing the size of the partition, not shrinking it - I'd be interested in hearing from people who have attempted to shrink their partition to know if it works.


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Section 11: Hardware Compatibility

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Q11.1) What IDE drives work on Acorn machines?

Note (added on 2nd Dec 1998): This list really needs a complete overhaul, which I am hoping to carry out, now that I have taken over the FAQ from Philip. Please keep an eye out for announcements of any updates. In the meantime, please feel free to notify me of any additions/amendments to the information provided below.

Here is a list of IDE drives known to either work or not work with Acorn hardware. If the drive appears with no notes then it will work fine with the machine specified. This list is maintained by Toby Smith (tcs@cs.bham.ac.uk) and all corrections, additions and updates should be emailed to him. Many thanks to those who have contributed their info.

The IDE Drives & Interfaces What Works With What list (19th October 1996)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
Manufacturer Part Number  Size  Interface     Notes   
Quantum      Sirocco      2560  Std/RiscPC    New Filecore
Seagate                   2150  Std/RiscPC    
IBM          Aquarius     2148  Std/RiscPC
WstnDigtl    Caviar       2148  Std/RiscPC    [6]
Samsung	WA32163A     2062  Simtec IDE
IBM          DJAA-31700   1740  Std/RiscPC
Quantum      SR1700AT     1740  Std/RiscPC    
NEC          DSE1700A     1700  Std/RiscPC    M-CDU76E S-CFS210A
WestDig      WD31600      1638  ICS (FS 3.13) (Partition on old filecore)
Quantum      FB1280AT     1310  Std/RiscPC    M-ToshibaXM5302B CDROM S-CFS420A
Conner       CFS1275A     1275  Std/RiscPC    M-CFS425     S-CFS420A     S-CFS210A
Seagate      ST51270A     1223  Std/RiscPC    M-CFS425 M-SonyCDU6ECDR
Fujitsu      M160TAU      1089  Std/RiscPC    Wont master.
Quantum      Fireball     1080  ICS/RiscPC
Quantum      Fireball     1024  Std/RiscPC
Seagate      31220A       1024  ICS/RiscPC    Master only
Seagate      ST580A        850  Std/RiscPC
Conner       CFS850A       850  ICS (FS 3.12) M-M2684TAM [1]
Samsung      SHD-30560A    560  Std/RiscPC    M-CP3204F S-QMav540A
WstrnDigtl   Caviar 2540   540  Std/RiscPC     E-IDE
WstrnDigtl   WD2540H       540  Std/RiscPC
Conner       CFA540A       540      [4]
Quantum                    540  DT Soft       Format to 512M
Fujitsu      1603T         540  Std/A5000 RPC Format 1023cyls = 503Mb space
Quantum      Maverick 540A 540  Std/RiscPC    M-CP3204F M-SHD30560A
Conner       CFS540A       540  Std/RiscPC    Formats to 512M
Conner       CFS541A       540  Std/A5000     M-CP30104H EIDE (512M = 1039 cyls)
Fujitsu      M2684TAM      528  ICS           Real 504M S-H3171-A2 [3]
IBM          DSAA-3540     528  Std/RiscPC    Odd noises! [3]
Seagate      ST5660A       528  Std/RiscPC    Format to 512M (1039 Cycls)
Quantum      LPS540A       504  Std/RiscPC
Fujitsu      M2684TAM      504  ICS (FS 3.13) S-ST9145AG
Conner       CFS425A       425  Std/AnyAcorn  Doesn't link to CFS210A and CFS425A
WstrnDigtl   Caviar        420  Std/RiscPC    [6]
Conner       CFS420A       420  Std/Acorn Evolution # M-CP3044 M-CFS210A M-FB1280AT
Seagate                    420  ICS
Maxtor       7420AV        420  ICS
Conner       CP30424 (?)   420  ICS    
Seagate      ST3491A       408                [2]
Maxtor       7345A         340  Std/RiscPC    S-CFS210. Wont work alone
Fujitsu      M286T         340  Watford       M-S-NEC D3756
Seagate      ST3389A       335  Std/RPC Evolution/A5000
Quantum      Prodrive      270  HCCS/A440 RPC    
Seagate      ST9300AG      260  Watford       S-CFS420A  2.5 drive
Conner       CP30254       250  ICS           M-CP3044 S-CFS420A
WstrnDigtl                 250  ICS
Seagate      ST3290A       250  A310
Conner       CFN250A       240  HCCSUltimate/A3010    
Conner       CFS210A       210  Std/RiscPC    # S-CFS420A
Conner       CP3204F       210  Std/RiscPC    S-QMav540A
Conner       CP3204F       210  Evolution
WstrnDigtl   Caviar        200  Std/AnyAcorn  WILL NOT WORK (poss [6])
IBM          H3171-A2      171  ICS           M-M2984TAM Real 163MB
Conner       CP30174E      170  Std/A5000    
SyQuest      EX135i        135  Std/RiscPC700    
Maxtor       7120          130  ICS           Disable on-disc cache. (ICS util)
Seagate      ST3144A       120  A310
Quantum      LPS127A       120  ICS    
Castle                     120  Castle/A3000
Conner       CP30104H      116  Std/A5000     S-CP540A
SyQuest      SQ3105 AT     105  Std/A5000     M-CP3044 S-CFS420A
NEC          D3756         100  Watford       M-S-M286T
Rodime       RO3139AP      100  Watford       Works alone wont co-exist.
Maxtor       7080           85  ICS           Disable on-disc cache. (ICS util)
Conner       CP3085 (?)     85  ICS           Running off computer's PSU too!
Conner       CF3008E        80  Std/A5000 A4000    #
Maxtor                      80  ICS (FS 2.03)
Conner       CP30084E       80  Std/A5000     M-S-CP3044 Use links on base
                                              not drive face.
Seagate      ST51A/X        40  Std/RiscPC    S-CFS420A
Seagate      ST351A/X       40  Watford IDE    
Conner       CP3044         40  Std/A5000     # S-SQ3105 AT
PrairieTek                  20  ICS (FS 2.01)    
NEC          CDR-273      CDROM Std/RiscPC600
Aztech                    CDROM Std/RiscPC700
NEC          CDR-273 4x   CDROM Std/RiscPC
NEC          CDR-1300A 6x CDROM Std/RiscPC
NEC          CDR1400A 8x  CDROM Std/RiscPC
BTC          BCD 739 8X   CDROM Std/RiscPC    Wont in Risc OS, will on PC-Card...
Phillips     PCA53 5x     CDROM Std/RiscPC    Wont in Risc OS, will on PC-Card...
Creatv Labs  Hex-Speed    CDROM Std/RiscPC

Enlargements to notes:
[1] Formatted to 3 partitions 248M     248M & 316M (to get small LFAU)  
[2] Seagate ST3491A Wont S/M to CFS240A (High end A5000). Will slave to CFS420A (Risc PC)
[3] This drive recalibrates for thermal adjustments every 10mins, making a click.
[4] CFA drives will work with RISC OS 3.60 (new Risc PCs, A7000) but not with older versions of the Acorn IDE interface. They will work on ICS interfaces though. (Badly defined part of IDE spec aparently)
[5] The HCCS interface apparently doesn't like podule slot 0, but is happy in others.
[6] WD Caviars often have initialisation problems - there is a fix elsewhere in the FAQ for this.
                    
Understanding the list:
 - Interface = 'Std/****' indicates the IDE interface provided with the specified machine as part of the standard purchase package.

 - M-XXXXXX  -Fitted as Master to drive (slave drive part number given)
S-XXXXXX  -Fitted as Slave to drive (Master drive part number given)

 - A '#' in the notes section indicates a drive provided as standard in an Acorn machine (at some point in history)

 - Sizes quoted are the 'manufacturer' sizes (for purchasing reference) remember that manufacturer Megabytes are 1000k, whereas formatted megabytes are 1024K... to get the 'real' size; multiply the number given by 1000, then divide by 1024.

 - Drives over 1Gigabyte are quoted in terms of megabytes (hence a 1G drive will be listed as 1024M) This is so that the list sorts nicely - divide the number by 1024 to get the size in gigabytes...

 - Master / Slave information usually refers to other drives in the list!

Disclaimer: This list reports the reported experiences of others. Neither the maintainer, nor the contributors are definitely saying that these combinations will work - just that they have for them. So don't sue us!

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Q11.2) What are the master / slave link settings for my IDE Drive?

Most of the modern drives have this information nicely on a label on the top of the drive, but some of the earlier ones don't. There follows a list of drive settings for some of the packaged drives.

Extra submissions to Toby Smith (tcs@cs.bham.ac.uk)

DRIVE           AS SOLE               AS MASTER               AS SLAVE
           HSP  C/D  DSP  ACT     HSP  C/D  DSP  ACT     HSP  C/D  DSP  ACT
CP3044      -    y    -    y       -    y    y    y       -    -    -    y
CP3008E     -    y    -    -       -    y    -    -       -    -    -    -
CP30126     -    y    -    -       -    y    y    -       -    -    -    -
CP30174E    -    y    -    -       -    y    -    -       -    -    -    -
CFS210A     -    y    -    -       -    y    -    -       -    -    -    -
CFS420A     -    y    -    -       -    y    -    -       -    -    -    -

Link connectors are on the front of the drive, the narrower end that doesn't have the cables coming in, next to the activity light connector (which is missing on Risc PC Drives - it's on the motherboard)

It should also be noted that if you need an extra linker don't expect it to have been provided (notably on the CF3008E, the 80M drive in the A4000 & A5000.)

(Details translated from table by Dave Walker, as published in Acorn User Sept 95. Not all permutations have been tested, and we ain't promising!)

Extra submissions welcome!

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Q11.3) Why won't my Western Digital IDE drive won't work after a cold boot?

Due to an obscure interaction between Acorn's IDE implementation and the Western Digital drives a problem occurs in that the computer becomes unable to find the Boot record that details the shape, format and other data of the hard drive. This results in a somewhat alarming and frustrating series of error messages that seem to indicate that the drive isn't formatted at all.
(And by extension implying that you have lost all your information stored on the drive.)

Fortunately that isn't the case. In reality your information is safe and sound on the drive and you merely need to give ADFS a helping hand in finding the boot record, after which it can carry on as normal. This BASIC program supplies dummy values to ADFS that allow it to do that.

REM> Specify
drive%=4
DIM rec% 64
FOR I%=0 TO 60 STEP 4:rec%!I%=0:NEXT
rec%?00=   9 : REM Sector size, 2^9 = 512
rec%?01=   8 : REM Sectors per track
rec%?02=   1 : REM Heads
rec%!16=4096 : REM Disc size in bytes
rec%?41=   0 : REM LBA mode disabled
SYS "ADFS_SectorDiscOp",,15+(rec%<<6),drive%<<29
END

(Thanks to Eduard Pfarr for this program.) 

Running this program once, during boot up, will allow the drive to be used normally. This does mean, for the moment, that you cannot boot from a Western Digital IDE drive.

NB for RISC OS 3.10, or earlier versions of RISC OS, you will need to replace the ADFS_SectorDiscOp with an ADFS_DiscOp call instead.

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Q11.4) What works with what?

This list contains details of peripherals known to work on Acorn computers, and is intended as a rough guide for those wanting to upgrade.

The list covers all storage devices: hard discs, magneto-optical drives, tape, CD-rom, and related interfaces. It also covers modems, serial cards and printers.It does not cover IDE hard discs, as these are covered in a separate list in the FAQ.

This list is based on information from users, but it's fairly out of date now. If you have new information, corrections, suggestions or if you just want to tell me how good it is, please contact me.

If you have any equipment which you no longer require, please consider donating it to Archive magazine or Clares Micro Supplies, who will find a deserving home for it. Contact Paul Beverley at paul@archivemag.co.uk or DClare@Clares.demon.co.uk

Note that in all the following lists the interface refers to the computer and not the peripheral.

Hard discs
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Computer Size  Manuf.     Model      Interface Interface  Special
                                     type      manuf      Requirements
----------------------------------------------------------------------------

A310     46MB  Seagate    ST157N     SCSI-1    Cumana/Oak none
A310     46MB  Seagate    ST277N     SCSI-1    Oak        Use Acorn SCSIFiler 
                                                          with RO3.1
A310     47MB  Seagate    257        SCSI-8    Lingenuity none
A310     60MB  Seagate    ST-277N    SCSI      Oak        Ext Apple
A310/4Mb 80Mb  Quantum    P80S       SCSI      Oak        none
A310     87Mb  Fujitsu    M2612S     SCSI-U    Morley     none
                          0608  
A310     100Mb Quantum    LP105S     SCSI-U    Morley     none
A310     105M  Quantum    Prodrive   SCSI      Oak        none
A310     105MB Rodime     RO-3128T   SCSI-1    Morley     none
A310     105MB Syquest    SQ105S     SCSI-1    Morley     none
A310     110MB Rodime     RO-5125ST  SCSI      Oak        Ext Apple
A310     117MB Quantum    LP120S     SCSI      VTi/Alsys  RO3.1+PowerROM
A310     191Mb Maxtor     LXT-200S   SCSI      Lingenuity none
A310     210MB Conner     CP3200F    SCSI      Oak        Ext Apple
A310/4Mb 210Mb Quantum    PD210S     SCSI      Oak        none
A310     240MB Quantum    LPS240S    SCSI-1    Morley     none
A310     270MB Syquest    SQ3270S    SCSI-1    Morley     none
A310     330Mb Seagate    ST2383N    SCSI-U    Morley     none
A310     340Mb Conner     CFA340     SCSI-1    Cumana/Oak none
A310     496MB Fujitsu    M2624S     SCSI      VTi/Alsys  RO3.1+PowerROM
A310     516Mb Quantum    Maverick   SCSI-U    Morley     none
                          540S 0901
A310     540MB Quantum    Fireball   SCSI-1    Morley     none
A310     700Mb Quantum    LIGHTNING  SCSI      Lingenuity none
                          730S    
A410/1   170MB Quantum    LPS170     SCSI-C    Morley     none
               ProDrive           
A410/1   115MB IBM        7910A12    SCSI-C    Morley     none
A410/1   213M  Maxtor     7213S      SCSI-U    Morley     none
A410/1   1GB   HP         C2247      SCSI-U    Morley     none
A420/1   730MB Quantm     LT730S     SCSI      TSP/AAD    512Mb max.
A420/1   330MB Maxtor     7345S      SCSI      TSP/AAD    none
A4xx/1   40MB  Seagate    ST251/1    ST506     Acorn      ext Case+PSU
A4xx/1   40MB  Seagate    ST251/0    ST506     Acorn      ext Case+PSU
A4xx/1   40MB  NEC        D3156      ST506     Acorn      none
A4xx/1   68MB  Seagate    ST1100     ST506     Acorn      none
A400/1   523MB IBM        DSAS-3540  SCSI-16   Cumana     none
A440/1   240M  Quantum    LPS240S    SCSI-U    Morley     none
A440/1   1G    Micropolis 4110       SCSI-U    Morley     none
A440     66M   Rodime     RO3085S    SCSI      Lingenuity none
A540     116Mb Conner     CP30100    SCSI      Acorn 1.05 none
R140     330MB Maxtor     7345S      SCSI      Acorn MK3  (Used with RISCiX)
R140     730MB Quantm     LT730S     SCSI      Acorn MK3  (Used with RISCiX)
A3000    42MB  NEC        D3835      SCSI      Serial port(VTi)
A3000    51Mb  Quantum    LP52S      SCSI   }  Cumana     none
A3000    81Mb  Quantum    ELS85S     SCSI   }  Cumana     none
A3000    105M  Quantum    LP105S     SCSI      HCCS-8i    none
A3000    540M  IBM        DSAS-3540  SCSI      HCCS-8i    doesn't work!
A3000    730M  Quantum    LT730S     SCSI      HCCS-8i    none
A4000    1G    IBM        DPES31080  SCSI      HCCS       none
A5000    340MB Quantum    LPS340S    SCSI      Cumana     none
A5000    540M  Conner     CP30540    SCSI1     Cumana     none
A5000    1.06G Conner     CFP1060S   SCSI-2    Cumana     none
A4       520M  Fujitsu    M2684S     PSCSI     Atomwide   bid parallel
RPC600   110MB Rodime     RO-5125ST  SCSI      Oak        Ext Apple
RPC600   116MB Conner     CP30100    SCSI-1    Alsystems  none
RPC600   121Mb Maxtor     7120SCS    SCSI-2    Cumana     none
RPC600   163MB Quantum    ELS170S    pll SCSI  Atomwide   none
RPC600   163MB Quantum    ELS170S    SCSI      Oak        none
RPC600   163MB Quantum    ELS170S    SCSI-2    Castle tec none
RPC600   163MB Quantum    ELS170S    SCSI      Morley-U&C none
RPC600   210MB Conner     CP3200F    SCSI      Oak        Ext Apple
RPC600   317MB Imprimis   94241-7    SCSI-1    Alsystems  none
RPC600   496Mb Fujitsu    M2624F-512 SCSI-1    TSP/AAD    none
RPC600   496MB Fujitsu    M2624F-512 SCSI-1    Alsystems  none
RPC600   502MB Quantum  ProDrive525S SCSI2     Alsystems  none
RPC600   507MB Fujitsu    M2684S-512 SCSI-2    Alsystems  none
RPC600   523Mb IBM        DSAS-3540  SCSI-2    Cumana     filecore limit
RPC600   550MB Quantum    Fireball   SCSI-2    MCS        none
RPC600   650Mb Cumana     Proteus    SCSI-2    Cumana     New Filecore
RPC600   850MB Quantum    TRB850S    SCSI-2    Cumana     none
RPC600   1Gb   Quantum    Fireball   SCSI-2    Cumana     none
                          FB1080     
RPC600   1G    Micropolis 4110       SCSI-U    Morley     none
RPC600   1.7G  Quantum    Sirocco    SCSI-2    Cumana     New Filecore
RPC600   2.1Gb Fujitsu    2915       SCSI-2    Cumana     New Filecore
RPC600   2.5G  Quantum    Sirocco    SCSI-2    Cumana     New Filecore
RPC700   105M  Quantum    LP105S     SCSI-2    Alsystems  none
RPC700   140M  Fujitsu    M2624SA    SCSI-U    Morley     none
RPC700   340MB Maxtor     7345A      IDE       Acorn      none
RPC700   540M  Conner     CP30540    SCSI1     Cumana     none
RPC700   730M  Quantum    LT730S     SCSI-2    Alsystems  none
RPC700   2G    Quantum    Atlas      scsi-2    Alsystems  early drives noisy *
RPC700   520M  Seagate    ST3660A    IDE       Acorn      none 
RPC700   1G    Fujitsu    M1614TAU   IDE       Acorn      none 
RPC700   1.6G  Conner     CFS1621A   IDE       Acorn      none 
RPC700   1,6G  WD         AC31600H   IDE       Acorn      slow startup, fast drive
RPC700   1.7G  NEC        D3747      IDE       Acorn      none 
RPC700   2G    Fujitsu    M1624TAU   IDE       Acorn      none 
RPC700   2G    Seagate    ST32161A   IDE       Acorn      none 
RPC700   2.1GB WD         AC21000    IDE       Acorn      none
RPC700SA 520M  Seagate    ST3660A    IDE       Acorn      none
RPC700SA 1.6G  Conner     CFS1621A   IDE       Acorn      none 
RPC700SA 2G    Seagate    ST32132A   IDE       Acorn      none
* RiscPC cases amplify vibrations from drives. According to Quantum technical support, drives with high spin speeds need to be internally balanced like car wheels to avoid vibration. Their first models (including the Atlas range) were not balanced, but current models are. Apparently the vibrations do not affect performance or reliability.

Non-working combinations
------------------------
A410/1   1GB   HP         C2247      SCSI-8    Lingenuity did not work
A3000    540M  IBM        DSAS-3540  SCSI      HCCS-8i    doesn't work!
A310/OS3.1/MEMC1A/ARM3               SCSI      VTi        see below

This combination has been reported to be troublesome due to timing problems on the bus. This problem does not occur with a standard A310. If the problem is found to be present, it can be fixed by fitting a 2nF capacitor across the /BL pull-up resistor.

Removable hard discs
--------------------
Computer Size  Manuf.     Model     Interface Interface  Special
                                    type      manuf      Requirements
----------------------------------------------------------------------------

A310     105MB Syquest    -         SCSI   Oak           none
A440/1    88MB Syquest    SQ5110    SCSI-U Morley        none
A410/1   105MB Syquest    -         SCSI-U Morley        none
A3000    135MB SyQuest    EZ135     SCSI   Cumana        none
A3000    270MB Syquest    SQ3270    SCSI   HCCS-8i       MOFS (!MagOpt)
A5000    135MB SyQuest    EZ135     SCSI   Cumana        none
A5000    270MB Syquest    SQ327     SCSI-2 Alsystems     none
A4       105MB Syquest    -         PSCSI  Atomwide bid  none
                                           parallel
RPC600    88MB Syquest    SQ5110    SCSI-2 Cumana        none
RPC600   105MB Syquest    -         IDE    ICS           none
RPC600   105MB Syquest    -         SCSI-2 Castle        none
RPC600   105MB Syquest    -         SCSI   Oak           none
RPC600   105MB Syquest    SQ3105S   SCSI-2 Castle        none
RPC600   135MB Syquest    EZ135     IDE    ICS           minor bugs
RPC600   135MB Syquest    EZ135     SCSI-C Morley        none
RPC600   200MB Syquest    SQ5200C   SCSI-2 Cumana        none
RPC600     1GB Iomega     JAZ       SCSI-2 PowerTec      none
RPC600SA 105MB Syquest    SQ3105S   SCSI-2 Castle        none
RPC600SA   1GB Iomega     JAZ       SCSI-2 PowerTec      none
RPC700   135MB SyQuest    EZ135     SCSI   Cumana 16bit  none
RPC700   135MB SyQuest    EZ135     SCSI   Cumana 32bit  none 
RPC700   135MB SyQuest    EZ135     SCSI-2 Alsystems     none
RPC700   135MB SyQuest    EZ135     IDE    Acorn         none
RPC700   270MB SyQuest    SQ3270    SCSI   Cumana 16bit  none
RPC700   270MB SyQuest    SQ3270    SCSI   Cumana 32bit
         Care needed with flash rom software upgrades
RPC700   270MB SyQuest    SQ3270    SCSI   Alsystems     none
RPC700   270MB Syquest    SQ3270    SCSI-2 Alsystems     none
         Firmware 3_05 and above recommended

CD ROM
------
Computer Speed Manuf.     Model      Interface Interface Special
                                     type      manuf     Requirements
----------------------------------------------------------------------------

A310     3.4x  Toshib     XM5201     SCSI-1    Cuman/Oak CDX driver
A310     1x    Sony       CDU-541    SCSI-U    Morley    none
A310     2x    Matsushita CR-503     SCSI      VTi/Alsys RO3.1+PowerROM
A410/1   2x    Apple      CD300      SCSI-C    Morley    AppleSony module
A410/1   2x    Sanyo      CRD-250S   SCSI-2    Morley    none
A420/1   2x    Apple      CD300e     SCSI      TSP/AAD   CDFS 2.2+ driver
A3000    2x    Toshiba    XM-3401TA  SCSI      HCCS-8i   none
A3000    4.4x  Toshiba    XM-3601TA  SCSI      HCCS-8i   IOC CDFS SCSI2 driver
A5000    2x    Toshiba    XM-3401TA  SCSI      Cumana    EESOX CDFS_SCSI2 driver for photocd
A5000    2x    Aiwa       ACD300     SCSI-2    Alsystems none        
A5000    4.4x  Pioneer    DR-U124X   SCSI-2    Cumana    Eesox SCSI2dr
RPC600   2x    Nakamichi  MBR-7      SCSI-2    Cumana    Eesox SCSI2 7cd changer
RPC600   2x    Apple      CD300e     SCSI      Acorn MK3 CDFS 2.2+ driver
RPC600   2x    Cumana     Indigo     IDE       Cumana    none
RPC600   -     Plextor    PX-4XCS    SCSI-2    Cumana        
RPC600   4x    Cumana     Proteus    SCSI-2    Cumana    
RPC600   4x    Sanyo      CRD-254S   SCSI-2    Cumana    EESOX scsi2 driver
RPC600   4x    Sony       CDU76S     SCSI-2    Cumana    Eesox SCSI2 driver
RPC600   4x    Sony       CDU77E     IDE       Acorn     RiscOs3.7/SA
RPC600   4x    Toshiba    XM-3601TA  SCSI-1    TSP/AAD   EESOX SCSI2 driver
RPC600   4x    Cumana     Proteus    SCSI-2    Cumana    none
RPC600   4x    Panasonic  PD-1 LF1000SCSI-2    Power-tec none
RPC600   4x    NEC        Multispin  SCSI-2    Power-tec none
RPC600   4x    Matsushita CR-504     SCSI-2    Power-tec none
RPC600   4x    Hitachi    CDR-770    IDE       Acorn     Cumana/Powertec ATAPI
RPC700   4.4x  Toshiba    XM-3601TA  SCSI-2    Alsystems none
RPC600   6x    Mitsumi    FX600      IDE       Acorn     CDFS2.30 or RO 3.6
RPC600   6x    TEAC       CD-56E     IDE       Acorn     CDFS2.30 or RO 3.6
RPC600   7x    Toshiba    XM-3701TA  SCSI-2    Cumana    Eesox SCSI2

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