Mainboard 81-110: Difference between revisions

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==81-110 General Info==
==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. ([https://retrocmp.de/kaypro/kay-p2_hrdw.htm#mb-kII Thomas Brase])  
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. ([https://retrocmp.de/kaypro/kay-p2_hrdw.htm#mb-kII Thomas Brase])  


It was exclusively used in the Kaypro II and for the most part was replaced by the [[Mainboard 81-240|81-240]] sometime in 1983.
It was exclusively used in the Kaypro II and for the most part was replaced by the [[Mainboard 81-240|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


==81-110A==
==81-110A==
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! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !! Notes
! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !! Notes
|-
|-
| #2775 || 1457 || 30 Jn 82<br>29 NLS || 81-149 || 81-146 || Drive Fix Mod
| #2767 || 1353 || 6-30-82<br>31 NLS || 81-149 || 81-146 || Q1
|-
| #2775 || 1457 || 30 Jn 82<br>29 NLS || 81-149 || 81-146 || Drive Fix Mod<br>Q1
|-
| #3249 || 1588 || 16 Jl 1982<br>29 NLS || 81-149(A) || 81-146 || Q1
|-
| #3590 || 2220 || 6 Au 1982 <br>4 Aug 1982 <br>NLS QA 115 || ? || ? || Drive Fix Mode<br>Monitor pin 21 -> U59 pin 2<br>U60 pin 1 ->pin 8<br>Speed up mod w/switch<br>RTC board<br>Q1
|-
| #4207 || 2997 || "R" NLS 3 || 81-149 || 81-146 || no mods<br>Q1
|-
|-
| #3590 || 2220 || 6 Au 1982 <br>4 Aug 1982 <br>NLS QA 115 || ? || ? || Drive Fix Mode<br>Monitor pin 21 -> U59 pin 2<br>U60 pin 1 ->pin 8<br>Speed up mod w/switch<br>RTC board
| #4307 || 2035 || "R" NLS 3 || 81-149 || 81-146 || Q1
|-
|-
| #4207 || 2997 || "R" NLS 3 || 81-149 || 81-146 || no mods
| #4222 || 3057 || "R" NLS 3 || 81-149 || 81-146 || no mods<br>(Q1?)
|-
|-
| #4222 || 3057 || "R" NLS 3 || 81-149 || 81-146 || no mods
| #4223 || 3051 || "R" NLS 3 || 81-149(C) || 81-146 || Drive Fix Mod<br>(Q1?)
|-
|-
| #4223 || 3051 || "R" NLS 3 || 81-149C || 81-146 || Drive Fix Mod
| #4623 || 3621 || "R" NLS 3 || 81-149 || 81-146 || Q1


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! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !!Notes
! 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<br>Drive Fix Mod<br>U86 Pin 4 -> Pin 3 (board) adapter<br>This board was swapped for #93481 since it is a rare board
| #7872 || 5372 || NLS 16 FT || MC K8 ProMonitor || MC Clean ProCHAR || CPU adapter board<br>Drive Fix Mod<br>U86 Pin 4 -> Pin 3 (board) adapter<br>This board was swapped for #93481 since it is a rare board<br>No Q1
|-
|-
| #8098 || 5319 || "R" NLS 3 || 81-149 || 81-146 || Aurex drive card<br>3 chip video card<br>Keyboard has been swapped so might be a "FrankenKaypro"
| #8098 || 5319 || "R" NLS 3 || 81-149 || 81-146 || Aurex drive card<br>3 chip video card<br>Keyboard has been swapped so might be a "FrankenKaypro"<br>No Q1
|-
|-
| #27396 || 3772 || "R" NLS 3<br>115-W || 81-149C || 81-146 || Drive Fix Mod<br>Q1
| #27396 || 3772 || "R" NLS 3<br>115-W || 81-149(C) || 81-146 || Drive Fix Mod<br>Q1
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|-
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|-
|-
| #12654 || 11355 || NLS 16 FT || 81-149 || 81-146 || Drive Fix Mod
| #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<br>'''K2''' 81-003 Model
|-
|-
| #15453 || 15852 || "R" NLS 3 || MC ProMonitor || 81-146 || Drive Fix Mod<br>Speed mod<br>5V RCA out<br>U52 Bypass
| #15453 || 15852 || "R" NLS 3 || MC ProMonitor || 81-146 || Drive Fix Mod<br>Speed mod<br>5V RCA out<br>U52 Bypass
Line 96: Line 116:
| #21460 || 10729 || "R" NLS 3 || 81-149 || 81-146 || No mods
| #21460 || 10729 || "R" NLS 3 || 81-149 || 81-146 || No mods
|-
|-
| #23201 || 14858 || 162-W || 81-149C || 81-146 || Drive Fix Mod
| #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<br>Shield
|-
| #43168 || 37841 || "R" NLS 3 || 81-149(C) || 81-146 || Drive Fix Mod<br>Shield<br>'''KII''' 81-003
|-
| #43486 || 35399 || 115-W || 81-149(C) || 81-146 || Drive Fix Mod<br>Shield
|-
|-
| #24500 || 7373 || "R" NLS 3 || 81-149C || 81-146 || Drive Fix Mod
| #45618 || 44964 || Round ? || 81-149(C) || ? || Drive Fix Mod<br>Shield<br>'''KII''' 81-003
|-
|-
| #27336 || 27618 || 115-W || 81-149C || 81-146 || Drive Fix Mod<br>Shield
| #57145 || 50971 || blank || 81-149C || 81-146 || Drive Fix Mod<br>Shield


|-
| Loose board || 16392 || "R" NLS 3 || None || 81-14? || Drive Fix Mod<br>Speed up<br>U66 Pin 3->4 (board)<br>U66 Pin 4->5
|-
| Loose board || 53659 || NLS FT 31 || ? || (MC?) Greek ProChar || Significant Repairs
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! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !! Notes
! Serial Num !! Board Num !! QC Sticker !!Monitor ROM !! Char ROM !! Notes
|-
|-
| #20250 || 21132 || 162-W || 81-149C || 81-146 || Drive Fix Mod
| #20250 || 21132 || 162-W || 81-149(C) || 81-146 || Drive Fix Mod
|-
|-
| #27007 || 28342 || Circle? || 81-149 || 81-146 || Drive Fix Mod<br>Shield
| #27007 || 28342 || Circle? || 81-149 || 81-146 || Drive Fix Mod<br>Shield
 
|-
| #42891 || 40019 || 116-W || MC K8 ProMonitor || 81-146 || Drive Fix Mod<br>3 chip video card<br>Monitor pin 21 -> U59 pin 2
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Latest revision as of 03:22, 27 November 2025

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

81-110A

The 81-110A is notable for 4 unpopulated chips locations from the Ferguson Big Board design (CTC, Monitor ROM, and 2 74LS chips).

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).

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

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

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
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