CPM Kaypros - Revision history

FrankRahman: /* Hardware */

2026-10-30T01:03:42Z

Hardware

← Older revision		Revision as of 01:03, 30 October 2026
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	==Hardware==		==Hardware==
	[[Hardware]]		[[Hardware]]

			"As of the first of October [1983], Kaypro has been soldering in all the small ICs."<br>
			(Micro Cornucopia, Oct 1983)

	==Modified Kaypro/Kaypros used as part of a system==		==Modified Kaypro/Kaypros used as part of a system==

FrankRahman: /* Theory of Operations */

2026-10-27T20:12:28Z

Theory of Operations

← Older revision		Revision as of 20:12, 27 October 2026
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	==Theory of Operations==		==Theory of Operations==
	The [[Theory of Operations]] from Micro Cornucopia		The [[Theory of Operations]] from Micro Cornucopia

			==Hardware==
			[[Hardware]]

	==Modified Kaypro/Kaypros used as part of a system==		==Modified Kaypro/Kaypros used as part of a system==

FrankRahman: /* References to Problems with Possible Fixes */

2026-10-27T10:17:50Z

References to Problems with Possible Fixes

← Older revision		Revision as of 10:17, 27 October 2026
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	==References to Problems with Possible Fixes==		==References to Problems with Possible Fixes==
			'''Drive Issues'''<br>
			"(Editor's note: Kaypro got a huge batch of flaky SMC data separators, and for several months, many systems were dying before they could get off the dealers' shelves. I assume that Ralph's system got one of the flaky chips. His next problem will probably be with the Tandon drives, but replacement with good quality half-wide Japanese drives is easy and quite inexpensive.)"<br>
			(Micro Cornucopia, Apr-May 1985)

	<blockquote>		<blockquote>
	'''Garbage Characters'''<br>		'''Garbage Characters'''<br>
	Michael Stocker called recently to say that he had finally rid his screen of occasional garbage characters (even when using the Pro-884 Max in fast video mode). He simply replaced the 6116 static RAM chips in the video section with faster (150ns) parts.		Michael Stocker called recently to say that he had finally rid his screen of occasional garbage characters (even when using the Pro-884 Max in fast video mode). He simply replaced the 6116 static RAM chips in the video section with faster (150ns) parts.

	He said he had gotten his new 6116s from Microprocessors Unlimited for $1.00 each (the video section holds two). The chips are located at U15 and U23 on the 84 Kaypro 1, 2, and 4.		He said he had gotten his new 6116s from Microprocessors Unlimited for $1.00 each (the video section holds two). The chips are located at U15 and U23 on the 84 Kaypro 1, 2, and 4.<br>
	(Micro Cornucopia, Feb-Mar 1986)		(Micro Cornucopia, Feb-Mar 1986)
	</blockquote>		</blockquote>

FrankRahman: /* References to Problems with Possible Fixes */

2026-10-26T23:35:02Z

References to Problems with Possible Fixes

← Older revision		Revision as of 23:35, 26 October 2026
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	He said he had gotten his new 6116s from Microprocessors Unlimited for $1.00 each (the video section holds two). The chips are located at U15 and U23 on the 84 Kaypro 1, 2, and 4.		He said he had gotten his new 6116s from Microprocessors Unlimited for $1.00 each (the video section holds two). The chips are located at U15 and U23 on the 84 Kaypro 1, 2, and 4.
	(Micro Cornucopia, Feb-Mar 1986) ~~[https://bitsavers.org/magazines/Micro_Cornucopia/Micro_Cornucopia_28_Feb86.pdf Link]~~		(Micro Cornucopia, Feb-Mar 1986)
	</blockquote>		</blockquote>

FrankRahman: /* References to Problems with Possible Fixes */

2026-10-26T23:34:19Z

References to Problems with Possible Fixes

← Older revision		Revision as of 23:34, 26 October 2026
Line 51:		Line 51:

	==References to Problems with Possible Fixes==		==References to Problems with Possible Fixes==
			<blockquote>
			'''Garbage Characters'''<br>
			Michael Stocker called recently to say that he had finally rid his screen of occasional garbage characters (even when using the Pro-884 Max in fast video mode). He simply replaced the 6116 static RAM chips in the video section with faster (150ns) parts.

			He said he had gotten his new 6116s from Microprocessors Unlimited for $1.00 each (the video section holds two). The chips are located at U15 and U23 on the 84 Kaypro 1, 2, and 4.
			(Micro Cornucopia, Feb-Mar 1986) [https://bitsavers.org/magazines/Micro_Cornucopia/Micro_Cornucopia_28_Feb86.pdf Link]
			</blockquote>

	<blockquote>		<blockquote>
	'''Kaypro Clock'''<br>		'''Kaypro Clock'''<br>

FrankRahman: /* CPM Models */

2026-10-26T21:17:16Z

CPM Models

← Older revision		Revision as of 21:17, 26 October 2026
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	[[Business Paks\|*Kaypro Business Paks]]		[[Business Paks\|*Kaypro Business Paks]]

			==Theory of Operations==
			The [[Theory of Operations]] from Micro Cornucopia

	==Modified Kaypro/Kaypros used as part of a system==		==Modified Kaypro/Kaypros used as part of a system==

FrankRahman: /* References to Problems with Possible Fixes */

2026-10-25T15:37:38Z

References to Problems with Possible Fixes

← Older revision		Revision as of 15:37, 25 October 2026
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	<blockquote>		<blockquote>
			'''Drive error - bad sectors'''<br>
	I use an old Kaypro 11-83 as a Z80 and Z8601 development system. I installed double-sided drives and the Pro 8 monitor ROM in 1984; the monitor version was 2.2.		I use an old Kaypro 11-83 as a Z80 and Z8601 development system. I installed double-sided drives and the Pro 8 monitor ROM in 1984; the monitor version was 2.2.

FrankRahman: /* Resetting the Real Time Clock */

2026-10-25T15:36:16Z

Resetting the Real Time Clock

@@ Line 47: / Line 47: @@
 [[CPM 2.2 ul compatibility]]
-==Resetting the Real Time Clock==
+==References to Problems with Possible Fixes==
 <blockquote>
 '''Kaypro Clock'''<br>
@@ Line 61: / Line 61: @@
 I suggest that after any internal hardware work on a Kaypro with a clock, the Kaypro clock program should be run. That may solve other people's clock problems. My other suggestion is to buy QP/M. After getting QP/M the clock keeps good time - before, it lost a few minutes a week.<br>
 (Micro Cornucopia, May-June 1989)
 </blockquote>
 ==End of CP/M machines==

FrankRahman: /* End of CP/M machines */

2026-10-25T15:22:20Z

End of CP/M machines

← Older revision		Revision as of 15:22, 25 October 2026
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	[[CPM 2.2 ul compatibility]]		[[CPM 2.2 ul compatibility]]

			==Resetting the Real Time Clock==
			<blockquote>
			'''Kaypro Clock'''<br>
			I recently had to have my Kaypro 4-84 operated on. Turns out the power supply was sending occasional power spikes. With that replaced, all is fine again. I recommend Xerox Service (at least the Rochester, New York, branch still knows CP/M machines - they were discharging an Osborne when the Kaypro and I arrived).

			The only problem was after servicing the machine when I used QP/M and got the message "Bad Clock?" It
			seemed to keep time okay after I reset it. I played with it for a day, but the message came up with each QP/M cold boot.

			I don't know what made me think of it but I tried a program supplied with the machine - the graphic clock display in MBASIC. I have always thought it was pretty, but slow and not very useful. Haven't used it in over a year.

			When I ran the Kaypro clock program, it asked if I wanted to set the clock. I said no because the clock was displaying the correct time with other programs. Then it said, "Clock not initialized ... , Enter new value:" and I said YES. It paused a moment and then asked for the time to set the clock. When I next cold booted with QP/M, all was fine.

			I suggest that after any internal hardware work on a Kaypro with a clock, the Kaypro clock program should be run. That may solve other people's clock problems. My other suggestion is to buy QP/M. After getting QP/M the clock keeps good time - before, it lost a few minutes a week.<br>
			(Micro Cornucopia, May-June 1989)
			</blockquote>

	==End of CP/M machines==		==End of CP/M machines==

FrankRahman at 22:10, 25 September 2026

2026-09-25T22:10:09Z

← Older revision		Revision as of 22:10, 25 September 2026
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	[[Kaypro Computer History Phil Clayton\|Kaypro Computer History by Phil Clayton]]		[[Kaypro Computer History Phil Clayton\|Kaypro Computer History by Phil Clayton]]

	===CPM Models===		==CPM Models==

	[[Kaypro Origin Stories]]		[[Kaypro Origin Stories]]
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	[[Business Paks\|*Kaypro Business Paks]]		[[Business Paks\|*Kaypro Business Paks]]

	===Modified Kaypro/Kaypros used as part of a system===		==Modified Kaypro/Kaypros used as part of a system==

	[[Omni Logic Analyzer]]		[[Omni Logic Analyzer]]
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	[[DK Synergy]]		[[DK Synergy]]

	===CPM Compatibility Problems===		==CPM Compatibility Problems==

	[[CPM 2.2 ul compatibility]]		[[CPM 2.2 ul compatibility]]

			==End of CP/M machines==

			<blockquote>
			Kaypro announced its decision to discontine manufacturing and marketing the CP/M line in November 1987 in order to "focus its sales and marketing efforts on a smaller group of mainstream technology computers."

			The announcment also stated, "The company will continue to provide technical support and will maintain available spare parts to support out-of-warranty needs of [CP/M] end users."

			Although there frankly are not a whole lot of Kaypro dealers who still service CP/M Kaypros, the ones who do are quite commited to the CP/M user.<br>
			(Profiles, July 1988)
			</blockquote>