RetroBBS - comp.sys.ibm.ps2.hardware - BCR27 SRAM Interface Control

BCR27 SRAM Interface Control

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: BCR27 SRAM Interface Control
Date: Fri, 24 Nov 2023 07:04:42 -0600
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by: Louis Ohland - Fri, 24 Nov 2023 13:04 UTC

Expansion Bus Clock Source [BCR27, pins 5-3]

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Expansion Bus Clock Source [BCR27, pins 5-3]
Date: Fri, 24 Nov 2023 07:10:58 -0600
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by: Louis Ohland - Fri, 24 Nov 2023 13:10 UTC

CLK_FAC [BCR27, pins 2-0]

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: CLK_FAC [BCR27, pins 2-0]
Date: Fri, 24 Nov 2023 07:15:02 -0600
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by: Louis Ohland - Fri, 24 Nov 2023 13:15 UTC

CLK_FAC Clock Factor. These bits are used to select whether the clock
selected by EBCS is used directly or if it is divided down to give a
slower clock for running the Expansion Bus access cycles. The possible
factors are given in Table 39.

CLK_FAC Clock Factor
000 1
001 1/2 (divide by 2)
010 Reserved
011 1/4 (divide by 4)
1XX Reserved

> Nothing earth-shattering

Dry hole Re: BCR27 SRAM Interface Control

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Dry hole Re: BCR27 SRAM Interface Control
Date: Fri, 24 Nov 2023 07:22:09 -0600
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by: Louis Ohland - Fri, 24 Nov 2023 13:22 UTC

"I have five dollars for each of you." -- Bernhard Goetz

computers / comp.sys.ibm.ps2.hardware / BCR27 SRAM Interface Control

Subject	Author
BCR27 SRAM Interface Control	Louis Ohland
Expansion Bus Clock Source [BCR27, pins 5-3]	Louis Ohland
CLK_FAC [BCR27, pins 2-0]	Louis Ohland
Dry hole Re: BCR27 SRAM Interface Control	Louis Ohland