Atari MEGA STe Manual do Utilizador descarregar pdf (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 pins at

the end are labelled. You can either solder the cable directly to the host adapter itself or a 15x2 1/10” pin

header.

Figure 3. Mega STE/Stacy host adapter ACSI connector.

ADDING A PARITY GENE RATOR TO THE HOST ADAPTER

This is a text I found on usenet 20 years ago or so. I have applied this modification to two Stacy host adapters

with success.

-------------------------8<-----------------------

SCSI Parity Generator

This is the Parity generation logic that solves the problem for those Atari users

that use SCSI adaptors without parity. As you can see it consists of one single

74HC280 chip. The easiest place to get to the SCSI signals is the harddisk itself.

You can use the four pin connector's red pin for +5V and the black for GROUND.

This parity generator has been tested with the following adaptors:

- ICD Link 1 (the first type)

- Megafile 44 SCSI adaptor

- Mega STE SCSI adaptor

- Protar SCSI adaptor

Pinout of the 74HC280

74HC280

+---\_/---+

D6 |1 14| +5V

D7 |2 13| D5

NC |3 12| D4

1 2 3 4 5 6

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Atari MEGA STe Manual do Utilizador Página 4