Re: Astra 1220S

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• In reply to: Cornelius, John: "Astra 1220S"
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"Cornelius, John" wrote:

>
> Adaptec AHA-2940/U2W HD68 is compatible but requires a converter with high
> byte termination from HD68 - HD25.
>
> Can some fill me in. What is high byte termination.
>

You scsi controller uses a wide=16 bit wide bus. The scanner uses an 8 bit wide bus.
Both ends of an scsi chain have to be terminated. The highbyte ends at the 16->8 bit
(wide->fast) converter so it has to be terminated there.

The problem is that the maximum cable length of a ultra scsi chain is 150 cm
(sum of internal + external length). If you exceed this length you will get problems
and may crash data on a scsi harddisk.

Take a look at available cables/adapters.
External devices normally use 50 pin (old=not mini) centronix adapters.
May be it would be better to get a 50->25 pin connector cable
and a 68(16bit)->50(8bit) converter with included termination.

Bye
Oliver

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