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SOME NOTES ABOUT THE STACY/MEGA

STE INTERNAL SCSI HOST ADAPTER

joska@online.no 2014.

The Stacy and Mega STE has internal ACSI ports and optionally an ACSI->SCSI host adapter. This host adapter

can also be used with other ST computers. I have successfully used this with both the ordinary ST DMA/ACSI

port and the Mega ST internal ACSI port.

LIMITATIONS OF THE SCSI ADAPTER

This SCSI adapter is not the most advanced – it has several restrictions compared to more recent and advanced

adapters like the ICD Link 2.

1. Does not work with drives that requires parity.

2. Only supports one single drive.

3. The attached drive must not be terminated. Be very careful to remove any termination resistor packs,

and do not enable termination power.

4. Use a short SCSI cable, not more than around 20cm.

5. The attached drive must have SCSI ID 0 (zero).

6. Only supports up to 1Gb. You can use bigger drives, but only the first Gb can be accessed.

7. Does not support “newer” SCSI features like SCSI arbitration and initiator ID identification. I think – I

know very little about SCSI.

1 and 7 are the biggest problems when using modern SCSI drives. You can use a (relatively) modern SCSI-3 drive

with a cheap 50-pin adapter from eBay, but chances are that it won’t work because it requires parity.

Problem 1 can be solved by adding a parity generator to the host adapter.

Problem 7 – I really don’t know exactly what’s going on. The drive will be recognised and you can use it (atleast

with HD-Driver) without any problems except that you can’t boot from it.

Problem 2 can be worked around, with a little modification the host adapter can access two SCSI drives with

standard hd drivers. I have not tested this.

Problem 6 can also be worked around with a small modification but needs a special hd driver by Pera Putnik. I

have not tested this.

1 2 3 4 5 6

ACSI PINOUT 2

Resumo do Conteúdo

Página 1

SOME NOTES ABOUT THE STACY/MEGA STE INTERNAL SCSI HOST ADAPTER [email protected] 2014. The Stacy and Mega STE has internal ACSI ports and optionally an

Página 2 - ACSI PINOUT

ACSI PINOUT By looking up this table you can easily make cables to connect the host adapter to the internal (in case of Mega ST) or external ACSI con

Página 3

EXTERNAL ACSI CONNECTOR The external ACSI connector you find on the back of all variants of the ST and also the TT. Figure 1. External ACSI connecto

Página 4

STACY/MEGA STE INTERNAL ACSI CONNECTOR This is the layout of the ACSI connector on the host adapter itself. It has two rows with 15 pins each, the pi

Página 5

INPUT |4 11| D3 EVEN |5 10| D2 ODD |6 9| D1 GND |7 8| D0 +---------+ The logical schematic for added parity

Página 6

I did not modify the harddisk itself as suggested by Martin Graiter. Instead I soldered the parity generator directly to the SCSI connector on the bac

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Atari MEGA STe Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Barebones PC/estação de trabalho Atari MEGA STe. SOME NOTES ABOUT THE STACY/MEGA STE INTERNAL SCSI Manual do Utilizador

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