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Meditations on 4-4 era SCSI controllers

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Meditations on 4-4 era SCSI controllers
Date: Sat, 7 Jan 2023 18:51:57 -0600
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by: Louis Ohland - Sun, 8 Jan 2023 00:51 UTC

While penetrating restricted airspace, I mulled over the positioning of
the SE 4-4 with the WD33C93B controller. Name ONE other IBM made SCSI
controller that does not use the C60/C68 external port.

Remember the Patriot? Price reduced SCSI controller with an HPDB50
external port.

Maybe... the 4-4 is a reduced price SE controller for external CDs or tapes.

Maybe... the 4-6 is a short version of an early version of a Fast/Wide
controller. Remember the short SCSI/A?

What RS/6000 _MCA_ F/W SCSI controller used a full length adapter?

Re: Meditations on 4-4 era SCSI controllers

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Subject: Re: Meditations on 4-4 era SCSI controllers
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by: Christian Holzapfel - Sun, 8 Jan 2023 04:03 UTC

Re: Meditations on 4-4 era SCSI controllers

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From: ohland@charter.net (Louis Ohland)
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Subject: Re: Meditations on 4-4 era SCSI controllers
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by: Louis Ohland - Sun, 8 Jan 2023 13:57 UTC

Let me be more klar. SE.

How many IBM MCA SCSI controllers used a short PCB?

IBM SCSI/A (short)
IBM Fast SCSI/A (Patriot, NOT made by IBM)
IBM F/W SCSI (Corvette)

One raisin, possumbly, for the differential SCSI to use a Type 3 card
(full length, but not Passplay) is the need for the jumper header for
the high availability function.

There is one other adapter that uses the HPDB50 external connector, the
FC (2420) SCSI-2 Differential High-Performance External I/O Controller
(Type 4-2).

One issue I have findting out more on RS/6000 adapters is that the
announcement letters are usually for a system. So you have to wade
through a lot of announcements to findt the earliest availability of a
specific adapter.

You can search for the FC, but...

Christian Holzapfel wrote:
> Louis Ohland schrieb am Sonntag, 8. Januar 2023 um 01:51:45 UTC+1:
>> What RS/6000 _MCA_ F/W SCSI controller used a full length adapter?
>
> The 4-C?
>

You might have mail.

computers / comp.sys.ibm.ps2.hardware / Re: Meditations on 4-4 era SCSI controllers

computers / comp.sys.ibm.ps2.hardware / Re: Meditations on 4-4 era SCSI controllers

Subject	Author
Meditations on 4-4 era SCSI controllers	Louis Ohland
Re: Meditations on 4-4 era SCSI controllers	Christian Holzapfel
Re: Meditations on 4-4 era SCSI controllers	Louis Ohland