Mainboard 81-110 - Revision history

FrankRahman: /* 81-110 */

2026-08-04T18:05:16Z

81-110

← Older revision		Revision as of 18:05, 4 August 2026
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	the 1771 to a 1791 for double density (5").		the 1771 to a 1791 for double density (5").
	The board has space for the CTC timer		The board has space for the CTC timer
	and for all four EPROMs but there is a		and for '''all four EPROMs''' but there is a
	socket for monitor ROM only."		socket for monitor ROM only."

FrankRahman: /* 81-110 */

2026-08-04T17:52:27Z

81-110

← Older revision		Revision as of 17:52, 4 August 2026
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	Source: Stargeezerlabs		Source: Stargeezerlabs
	\|}		\|}

			There is a possibility that there could have been an even earlier board according to a letter to the editor in the December 1982 Microcornucopia "They used 4164
			RAMs, the keyboard outputs serial data
			to port B of the SIO, and they changed
			the 1771 to a 1791 for double density (5").
			The board has space for the CTC timer
			and for all four EPROMs but there is a
			socket for monitor ROM only."

	===81-110 Machines===		===81-110 Machines===
	{\| class="wikitable"		{\| class="wikitable"

FrankRahman: /* 81-110 */

2026-07-02T14:28:11Z

81-110

← Older revision		Revision as of 14:28, 2 July 2026
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	==81-110==		==81-110==
	~~This is an~~ 81-110~~(no letter~~) ~~board. Note the C21, R37, and R38 are silk screened~~ 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.		See [[Lucy (81-110 Motherboard)\|Lucy]] for details.

	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 this board may have required additional rework delaying it's use. The chassis that it is in does not have a serial number but the power switch implies it is not among the first machines delivered.
	{\|		{\|
	\|-		\|-

FrankRahman: /* 81-110 Machines */

2026-07-02T13:41:31Z

81-110 Machines

← Older revision		Revision as of 13:41, 2 July 2026
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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
	\|-		\|-
	\| Label Missing \|\| 1145 \|\| 26JL82 \|\| No Label \|\| D182 \|\| Drive Fix Mod<br>Q1		\| "[[Lucy (81-110 Motherboard)\|Lucy]]"<br>Label Missing (Version 2 small power switch and black handle covers would place it near #3200-3800) \|\| 1145 \|\| 26JL82 \|\| No Label \|\| D182 \|\| Drive Fix Mod<br>Q1

	<!--		<!--

FrankRahman: /* 81-110A */

2026-03-04T21:00:09Z

81-110A

← Older revision		Revision as of 21:00, 4 March 2026
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	==81-110A==		==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).		The 81-110A is notable for 4 unpopulated chips locations from the Ferguson Big Board design (CTC, Monitor ROM, and 2 74LS chips). It was proceeded by at lest one 81-110 in serial number.
	{\|		{\|
	\|-		\|-

FrankRahman: /* 81-110 */

2026-03-04T20:57:46Z

81-110

← Older revision		Revision as of 20:57, 4 March 2026
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	==81-110==		==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.		This is an 81-110(no letter) board. Note the C21, R37, and R38 are silk screened 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~~.		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 this board may have required additional rework delaying it's use. The chassis that it is in does not have a serial number but the power switch implies it is not among the first machines delivered.
	{\|		{\|
	\|-		\|-

FrankRahman: /* 81-110 General Info */

2026-03-04T20:49:48Z

81-110 General Info

← Older revision		Revision as of 20:49, 4 March 2026
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	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.

			Most of the oldest machines used the 81-110A board but an 81-110(no letter) board has appeared and appears to be the oldest known board.

	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.		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.

FrankRahman: /* 81-110 */

2026-03-03T22:41:38Z

81-110

← Older revision		Revision as of 22:41, 3 March 2026
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	\|		\|
	[[File:81-110 bottom small.jpg\|600px]]<br>		[[File:81-110 bottom small.jpg\|600px]]<br>
	Source: ~~Stargeezer~~		Source: Stargeezerlabs
	\|}		\|}
	===81-110 Machines===		===81-110 Machines===
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	-->		-->
	\|}		\|}


	==81-110A==		==81-110A==

FrankRahman at 22:40, 3 March 2026

2026-03-03T22:40:32Z

@@ Line 24: / Line 24: @@
 |-
+|
-[[File:81-110 bottom small.jpg|600px]]
+[[File:81-110 bottom small.jpg|600px]]<br>
 |}
 ==81-110A==

FrankRahman: /* 81-110? */

2026-03-03T22:33:11Z

81-110?

← Older revision		Revision as of 22:33, 3 March 2026
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	* ROMs are as labeled		* ROMs are as labeled

	==81-110?==		==81-110==
	This image was shared with a friend ~~and may be of~~ an 81-110(no letter) board. Note the C21, R37, R38 ~~and an IC chip~~ silk screen for components that are not installed. 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.		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.		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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	\|		\|
	[[File:81-110 unk MB small.jpg\|600px]]		[[File:81-110 unk MB small.jpg\|600px]]
			\|-
			\|
			[[File:81-110 bottom small.jpg\|600px]]
	\|}		\|}