Mainboard 81-110: Difference between revisions
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| #4207 || 2997 || "R" NLS 3 || 81-149 || 81-146 || no mods | | #4207 || 2997 || "R" NLS 3 || 81-149 || 81-146 || no mods | ||
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| #4222 || 3057 || "R" NLS 3 || 81-149 || 81-146 || no mods | |||
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| #4223 || 3051 || "R" NLS 3 || 81-149C || 81-146 || Drive Fix Mod | | #4223 || 3051 || "R" NLS 3 || 81-149C || 81-146 || Drive Fix Mod | ||
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Revision as of 03:04, 24 September 2025
81-110 General Info
The 81-110 Mainboard was the original Kaypro board and debuted with the first Kaypro II machines. It's design was based on the Ferguson Big Board. (Thomas Brase)
It was exclusively used in the Kaypro II and for the most part was replaced by the 81-240 sometime in 1983.
81-110A
The 81-110A is notable for 4 unpopulated chips locations from the Ferguson Big Board design (CTC, Monitor ROM, and 2 74LS chips).
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81-110A Machines
| Serial Num | Board Num | QC Sticker | Monitor ROM | Char ROM | Notes |
|---|---|---|---|---|---|
| #2775 | 1457 | 30 Jn 82 29 NLS |
81-149 | 81-146 | Drive Fix Mod |
| #3590 | 2220 | 6 Au 1982 4 Aug 1982 NLS QA 115 |
? | ? | Drive Fix Mode Monitor pin 21 -> U59 pin 2 U60 pin 1 ->pin 8 Speed up mod w/switch RTC board QC dated 4 & 6 Aug 1982 |
| #4207 | 2997 | "R" NLS 3 | 81-149 | 81-146 | no mods |
| #4222 | 3057 | "R" NLS 3 | 81-149 | 81-146 | no mods |
| #4223 | 3051 | "R" NLS 3 | 81-149C | 81-146 | Drive Fix Mod |
81-110B
The B board in extremely rare. It apparently had some technical problems that required the rapid update to the B1 board. It's design allowed for the total chips used to be reduced from 83 (A board) to 72 (B board).
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81-110B1
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