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computers / comp.sys.ibm.ps2.hardware / Re: PC 730/750 "secret" 33 MHz base clock setting

PC 730/750 "secret" 33 MHz base clock setting

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Subject: PC 730/750 "secret" 33 MHz base clock setting
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Fri, 24 Nov 2023 09:03 UTC

IBM states:

J26/J27 = 2-3/2-3 => 50 MHz
J26/J27 = 2-3/1-2 => 60 MHz
J26/J27 = 1-2/1-2 => 66 MHz

By setting the fourth option

J26/J27 = 1-2/2-3

the system runs at a 33 MHz CPU base clock.
Darn, was hoping for 75...

Update PC750 page

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Update PC750 page
Date: Fri, 24 Nov 2023 06:17:23 -0600
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by: Louis Ohland - Fri, 24 Nov 2023 12:17 UTC

https://www.ardent-tool.com/PC750/#Jumpers

Bus/CPU Speed MHz Setting

Is there a reason why the board component outline follows the arcane IBM
location diagram, instead of the [sl]eazier to understand method used on
the Ardent Tool?

Example:
2 (J15) Modem Ring Detect connector

How about:
J15 Modem Ring Detect connector

Christian Holzapfel wrote:
> IBM states:
>
> J26/J27 = 2-3/2-3 => 50 MHz
> J26/J27 = 2-3/1-2 => 60 MHz
> J26/J27 = 1-2/1-2 => 66 MHz
>
> By setting the fourth option
>
> J26/J27 = 1-2/2-3
>
> the system runs at a 33 MHz CPU base clock.
> Darn, was hoping for 75...
>

Re: PC 730/750 "secret" 33 MHz base clock setting

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From: slavotinek@gmail.com (Tomas Slavotinek)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
Date: Wed, 29 Nov 2023 22:17:48 +0100
Organization: csiph.com Internet News Service
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by: Tomas Slavotinek - Wed, 29 Nov 2023 21:17 UTC

On 24.11.2023 10:03, Christian Holzapfel wrote:
> IBM states:
>
> J26/J27 = 2-3/2-3 => 50 MHz
> J26/J27 = 2-3/1-2 => 60 MHz
> J26/J27 = 1-2/1-2 => 66 MHz
>
> By setting the fourth option
>
> J26/J27 = 1-2/2-3
>
> the system runs at a 33 MHz CPU base clock.
> Darn, was hoping for 75...

Thanks! Table updated:
https://ardent-tool.com/PC750/#Jumpers

Re: Update PC750 page

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From: slavotinek@gmail.com (Tomas Slavotinek)
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Subject: Re: Update PC750 page
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by: Tomas Slavotinek - Wed, 29 Nov 2023 21:20 UTC

On 24.11.2023 13:17, Louis Ohland wrote:
> https://www.ardent-tool.com/PC750/#Jumpers
>
> Is there a reason why the board component outline follows the arcane IBM
> location diagram, instead of the [sl]eazier to understand method used on
> the Ardent Tool?

Well, it's simple. Nobody bothered to make a proper outline...

But I have a PC750 meow, so that's gonna change soon(tm).

Re: PC 730/750 "secret" 33 MHz base clock setting

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From: slavotinek@gmail.com (Tomas Slavotinek)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
Date: Mon, 18 Dec 2023 21:00:42 +0100
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by: Tomas Slavotinek - Mon, 18 Dec 2023 20:00 UTC

Christian, is the second bus/core ratio jumper (J30) populated on your
board?

https://www.ardent-tool.com/PC750/#Jumpers

Also, can you please czech what the FRU P/N and board P/N is on yours?

Re: PC 730/750 "secret" 33 MHz base clock setting

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Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Mon, 18 Dec 2023 20:37 UTC

Tomas Slavotinek schrieb am Montag, 18. Dezember 2023 um 21:00:44 UTC+1:
> Christian, is the second bus/core ratio jumper (J30) populated on your
> board?

No, not on any of my boards.
I have three, with one being stored far away right now. I will check once I have it in my hands again.

The ones I have here have a white label near header J14, and they say

8133493 (Earlier version with S3 86C864-P Vision864 video)
8133761 (Later version with the 86C868 chip)

Not sure if it's a P/N or FRU though...

Re: PC 730/750 "secret" 33 MHz base clock setting

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From: slavotinek@gmail.com (Tomas Slavotinek)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
Date: Mon, 18 Dec 2023 23:33:59 +0100
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by: Tomas Slavotinek - Mon, 18 Dec 2023 22:33 UTC

On 18.12.2023 21:37, Christian Holzapfel wrote:
> 8133493 (Earlier version with S3 86C864-P Vision864 video)
> 8133761 (Later version with the 86C868 chip)
>
> Not sure if it's a P/N or FRU though...

Hmm, I don't think that's a P/N. IBM used the following format during
this era: nnXnnnn where n is a number and X a letter (usually F, G, H,
or X). But there are some exceptions to this rule (like the thin-carrier
Synchrostream chip used on some T4 "Y" complexes).

For example my PCI/MCA PC750 planar has the following P/Ns on it.
-one side of the riser connector: FRU P/N 40H4759, P/N 06H9588
-near the front edge of the PCB: P/N 40H4755

But IBM loved to move the stickers around. Or silkscreen some of the
numbers directly onto the PCB...

Re: PC 730/750 "secret" 33 MHz base clock setting

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Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Tue, 19 Dec 2023 08:54 UTC

Re: PC 730/750 "secret" 33 MHz base clock setting

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Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Tue, 19 Dec 2023 08:59 UTC

Christian Holzapfel schrieb am Dienstag, 19. Dezember 2023 um 09:54:06 UTC+1:
> Tomas Slavotinek schrieb am Montag, 18. Dezember 2023 um 23:34:02 UTC+1:
> > Hmm, I don't think that's a P/N.
> Got it.
>
> "12H1954 IBM FRU 55" on the S3 864 board, near the CPU
> "40H4759 IBM FRU 55" on the S3 868 board, near the VRAM.

BTW on Facebook a fellow PS/2 user claimed he bought an 88G4270, possibly from a PC Server 310.

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Newsgroups: comp.sys.ibm.ps2.hardware
Date: Tue, 19 Dec 2023 01:15:18 -0800 (PST)
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Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Tue, 19 Dec 2023 09:15 UTC

Re: PC 730/750 "secret" 33 MHz base clock setting

<ulvkvm$26ku$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>

copy mid

https://www.rocksolidbbs.com/computers/article-flat.php?id=4365&group=comp.sys.ibm.ps2.hardware#4365

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From: slavotinek@gmail.com (Tomas Slavotinek)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: PC 730/750 "secret" 33 MHz base clock setting
Date: Wed, 20 Dec 2023 22:05:57 +0100
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by: Tomas Slavotinek - Wed, 20 Dec 2023 21:05 UTC

Subject	Author
PC 730/750 "secret" 33 MHz base clock setting	Christian Holzapfel
Update PC750 page	Louis Ohland
Re: Update PC750 page	Tomas Slavotinek
Re: PC 730/750 "secret" 33 MHz base clock setting	Tomas Slavotinek
Re: PC 730/750 "secret" 33 MHz base clock setting	Tomas Slavotinek
Re: PC 730/750 "secret" 33 MHz base clock setting	Christian Holzapfel
Re: PC 730/750 "secret" 33 MHz base clock setting	Tomas Slavotinek
Re: PC 730/750 "secret" 33 MHz base clock setting	Christian Holzapfel
Re: PC 730/750 "secret" 33 MHz base clock setting	Christian Holzapfel
Re: PC 730/750 "secret" 33 MHz base clock setting	Christian Holzapfel
Re: PC 730/750 "secret" 33 MHz base clock setting	Tomas Slavotinek