Mainboard 81-110: Difference between revisions
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===81-110 Machines=== | |||
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! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !! Notes | |||
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| Label Missing || 1145 || 26JL82 || No Label || D182 || Drive Fix Mod<br>Q1 | |||
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| #S/N || bnum || QC || mon || char || notes | |||
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==81-110A== | ==81-110A== | ||
Revision as of 22:40, 3 March 2026
81-110 General Info
The 81-110 Mainboard was the original Kaypro board and debuted with the first Kaypro II machines, including the Kaycomp 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.
The 81-110B, B1 and B2 represent a cost reduced version of the 81-110A board since they use fewer chips. It is likely that the 81-110B board had an issue since it was replaced very quickly making that board relatively rare.
Also note that the floppy controller chip was changed when they switched from the 81-110A to the 81-110B board.
Legand/Info:
- 81-149(C) = 81-149 C written in
- MC = MicroCornucopia
- Q1 = Q1 and C6 are present
- ROMs are as labeled
81-110
This image was shared with a friend is an 81-110(no letter) board. Note the C21, R37, and R38 are silk screen for components that are not installed. The U88 was intended to be a 16 pin chip but was replaced by the FDC9216 which only has 8 pins so the footprint extends beyond the chip. There are sockets on the board for the chips not present on the 81-110A boards but these could have been added after production. Both ROMS appear to be Intel D2816 EEPROMs. On other boards they would usually be EPROMs which are not electronically erasable.
The board's number is 1145 which is earlier than 1353 which was the earliest 81-110A board seen. The QC Sticker is dated 26JL82 which is after the three earliest 81-110A boards so the machine may have been shipped later.
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81-110 Machines
| Serial Num | Board Num | QC Sticker | Monitor ROM | Char ROM | Notes |
|---|---|---|---|---|---|
| Label Missing | 1145 | 26JL82 | No Label | D182 | Drive Fix Mod Q1 |
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 |
|---|---|---|---|---|---|
| #2767 | 1353 | 6-30-82 31 NLS |
81-149 | 81-146 | Q1 |
| #2775 | 1457 | 30 Jn 82 29 NLS |
81-149 | 81-146 | Drive Fix Mod Q1 |
| #3249 | 1588 | 16 Jl 1982 29 NLS |
81-149(A) | 81-146 | Q1 |
| #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 Q1 |
| #4207 | 2997 | "R" NLS 3 | 81-149 | 81-146 | no mods Q1 |
| #4307 | 2035 | "R" NLS 3 | 81-149 | 81-146 | Q1 |
| #4222 | 3057 | "R" NLS 3 | 81-149 | 81-146 | no mods (Q1?) |
| #4223 | 3051 | "R" NLS 3 | 81-149(C) | 81-146 | Drive Fix Mod (Q1?) |
| #4623 | 3621 | "R" NLS 3 | 81-149 | 81-146 | Q1 |
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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81-110B Machines
| Serial Num | Board Num | QC Sticker | Monitor ROM | Char ROM | Notes |
|---|---|---|---|---|---|
| #7872 | 5372 | NLS 16 FT | MC K8 ProMonitor | MC Clean ProCHAR | CPU adapter board Drive Fix Mod U86 Pin 4 -> Pin 3 (board) adapter This board was swapped for #93481 since it is a rare board No Q1 |
| #8098 | 5319 | "R" NLS 3 | 81-149 | 81-146 | Aurex drive card 3 chip video card Keyboard has been swapped so might be a "FrankenKaypro" No Q1 |
| #27396 | 3772 | "R" NLS 3 115-W |
81-149(C) | 81-146 | Drive Fix Mod Q1 |
MC= MicroCornucopia
81-110B1
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81-110B1 Machines
| Serial Num | Board Num | QC Sticker | Monitor ROM | Char ROM | Notes |
|---|---|---|---|---|---|
| #7954 | 6992 | NLS 16 FT | MC ProMonitor | MC Clean ProCHAR | Drive Fix Mod |
| #8409 | 6855 | NLS 16 FT | 81-149 | 81-146 | No mods |
| #10126 | 9267 | "R" NLS 3 | 81-149 | 81-146 | No mods |
| #12275 | 15561 | "R" NLS 3 | 81-149 | 81-146 | No mods |
| #12654 | 11355 | NLS 16 FT | 81-149 | 81-146 | Drive Fix Mod |
| #13480 | 26987 | "R" NLS 84 | 81-149(C) | 81-146A | Drive Fix Mod K2 81-003 Model |
| #15453 | 15852 | "R" NLS 3 | MC ProMonitor | 81-146 | Drive Fix Mod Speed mod 5V RCA out U52 Bypass |
| #16288 | 16001 | "R" NLS 31 | 81-149 | 81-146 | No mods |
| #21460 | 10729 | "R" NLS 3 | 81-149 | 81-146 | No mods |
| #23201 | 14858 | 162-W | 81-149(C) | 81-146 | Drive Fix Mod |
| #24500 | 7373 | "R" NLS 3 | 81-149(C) | 81-146 | Drive Fix Mod |
| #27336 | 27618 | 115-W | 81-149(C) | 81-146 | Drive Fix Mod Shield |
| #43168 | 37841 | "R" NLS 3 | 81-149(C) | 81-146 | Drive Fix Mod Shield KII 81-003 |
| #43486 | 35399 | 115-W | 81-149(C) | 81-146 | Drive Fix Mod Shield |
| #45618 | 44964 | Round ? | 81-149(C) | ? | Drive Fix Mod Shield KII 81-003 |
| #57145 | 50971 | blank | 81-149C | 81-146 | Drive Fix Mod Shield |
| Loose board | 16392 | "R" NLS 3 | None | 81-14? | Drive Fix Mod Speed up U66 Pin 3->4 (board) U66 Pin 4->5 |
| Loose board | 53659 | NLS FT 31 | ? | (MC?) Greek ProChar | Significant Repairs |
81-110B2
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81-110B2 Machines
| Serial Num | Board Num | QC Sticker | Monitor ROM | Char ROM | Notes |
|---|---|---|---|---|---|
| #20250 | 21132 | 162-W | 81-149(C) | 81-146 | Drive Fix Mod |
| #27007 | 28342 | Circle? | 81-149 | 81-146 | Drive Fix Mod Shield |
| #42891 | 40019 | 116-W | MC K8 ProMonitor | 81-146 | Drive Fix Mod 3 chip video card Monitor pin 21 -> U59 pin 2 |