Hi, here are Cromemco rework level listings (E, F, F1) for ZPU boards. Hope this helps you.-----Original Message----- From: Kryoclasm (Shawn)
Sent: Thursday, June 04, 2015 2:37 PM To: n8vem...@googlegroups.com Subject: [N8VEM-S100:7179] Cromemco ZPU Hello,I just acquired a Cromemco ZPU cpu board and was wondering if anyone has had any experience with it.
Any thoughts or firsthand info would be nice. Thanks. http://www.s100computers.com/Hardware%20Folder/Cromemco/Z80/ZPU.htm Shawn --You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
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MODIFICATION LEVEL SUMMARY
Product Code P/N Product Type ZPU
Page 1 of 1 Date Issued 08/01/83 Revision F
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Mod Level 1 Reference # Date Released 07/20/81
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Change: 1) To the top right of IC4, cut trace between "M1" & "0".
2) Run a wire on the component side from the same "M1" to
IC40-4.
Reason: 1-2) One "wait" state inserted on all interrupt
acknowledge
cycles to increase reliability with the 4FDC, 16FDC &
TU-ART.
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Mod Level 2 Reference # Date Released 08/30/82
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Change: 1) Change R18 from 1K (001-0018) to 2.2K ohms (001-0021).
Reason: 1) Prevents failure of PRESET circuit from excess heat.
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MODIFICATION LEVEL SUMMARY
Product Code P/N Product Type ZPU
Page 1 of 1 Date Issued 08/01/83 Revision E
====================================================================
===
Mod Level 1 Reference # Date Released 07/20/81
--------------------------------------------------------------------
---
Change: 1) To the right of IC4, cut trace between "M1" & "0".
2) Run a wire on the component side from the same "M1" to
IC40-4.
Reason: 1-2) One "wait" state inserted on all interrupt
acknowledge
cycles to increase reliability with the 4FDC, 16FDC &
TU-ART.
--------------------------------------------------------------------
---
Mod Level 2 Reference # Date Released 08/30/82
--------------------------------------------------------------------
---
Change: 1) Change R18 from 1K (001-0018) to 2.2K ohms (001-0021).
Reason: 1) Prevents failure of PRESET circuit from excess heat.
Attachment:
IMSAI FP trouble with Cromemco ZPU.pdf
Description: Adobe PDF document
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MODIFICATION LEVEL SUMMARY
Product Code P/N Product Type ZPU
Page 1 of 1 Date Issued 08/01/83 Revision F1
====================================================================
===
Mod Level 1 Reference # Date Released 08/30/82
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---
Change: 1) Change R18 from 1K (001-0018) to 2.2K ohms (001-021).
Reason: 1) Prevents failure of PRESET circuit from excess heat.