Multi-Pak Interface - Revision history

Tlindner: Removed line about how a modified MPI is incompatible with a CoCo 1/2.

2025-09-21T13:49:03Z

Removed line about how a modified MPI is incompatible with a CoCo 1/2.

← Older revision		Revision as of 09:49, 21 September 2025
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	To make a 20-3024 Multi-Pak Interface work with both a CoCo 1/2 and a CoCo 3 requires a piggybacked PAL/GAL with a switch to activate one or the other. I'm sure someone can figure out some circuitry to switch the 20-3124 type Multi-Pak Interface.		To make a 20-3024 Multi-Pak Interface work with both a CoCo 1/2 and a CoCo 3 requires a piggybacked PAL/GAL with a switch to activate one or the other. I'm sure someone can figure out some circuitry to switch the 20-3124 type Multi-Pak Interface.

	~~Neither setup is stable with the other CoCos. That is, once you upgrade to the CoCo 3 address set, your CoCo 1/2 will be unreliable with that Multi-Pak Interface.~~

	[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/05/26-3124-mpi-coco-3-upgrade-1/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #1 (add in a 74SL10 chip to limit the address range)]<br />		[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/05/26-3124-mpi-coco-3-upgrade-1/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #1 (add in a 74SL10 chip to limit the address range)]<br />

Carney: Carney moved page Multi-Pak to Multi-Pak Interface: full / proper name

2024-03-27T23:29:18Z

Carney moved page Multi-Pak to Multi-Pak Interface: full / proper name

← Older revision	Revision as of 19:29, 27 March 2024
(No difference)

Carney: switched 8 slot MPI link to Archive since CoCo3.com is gone :(

2024-03-14T15:45:05Z

switched 8 slot MPI link to Archive since CoCo3.com is gone :(

← Older revision		Revision as of 11:45, 14 March 2024
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	There are also [http://www.youtube.com/watch?v=zy8WdMEAF5Y custom made MULTIPAK]		There are also [http://www.youtube.com/watch?v=zy8WdMEAF5Y custom made MULTIPAK]
	and [http://www.coco3.com/community/2010/07/this-is-part-1-of-2-of-an-8-slot-mpi-multi-pak-interface-design-for-my-friends-at-coco3-com-andor-the-maltedmedia-list-members-from-your-friend-johngimechip-com/ 8 Slot MULTIPAK]		and [https://web.archive.org/web/20140814210838/http://www.coco3.com/community/2010/07/this-is-part-1-of-2-of-an-8-slot-mpi-multi-pak-interface-design-for-my-friends-at-coco3-com-andor-the-maltedmedia-list-members-from-your-friend-johngimechip-com/ 8 Slot MULTIPAK (archived)]

Barberd at 20:14, 18 April 2021

2021-04-18T20:14:31Z

← Older revision		Revision as of 16:14, 18 April 2021
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	'''To use the MULTI-PAK smoothly with Color Computer 3, use this:'''		'''To use the MULTI-PAK smoothly with Color Computer 3, use this:'''

	Upgrading 26-3024 MPIs ~~uses~~ a PAL/GAL chip programmed for the CoCo 3's addressing pattern.		Upgrading 26-3024 MPIs typically replaces the existing PAL chip with a PAL/GAL chip programmed for the CoCo 3's addressing pattern, or redirect a pin on the PAL to a 74SL10 to limit the addressing.

	Upgrading the 26-3124 involves trace cutting and wiring in a 74LS10 chip to change the addresses.		Upgrading the 26-3124 involves trace cutting and wiring in a 74LS10 chip to change the addresses.

			(From Cloud9's website): Here's a simple test that will determine if your Mulit-Pak has already been upgraded to work with a CoCo 3. From BASIC's OK prompt, type PRINT PEEK(&HFF90) and press ENTER. If 126 is returned then the Multi-Pak has been upgraded. If it returns 255 then it has NOT been upgraded.

	To make a 20-3024 Multi-Pak Interface work with both a CoCo 1/2 and a CoCo 3 requires a piggybacked PAL/GAL with a switch to activate one or the other. I'm sure someone can figure out some circuitry to switch the 20-3124 type Multi-Pak Interface.		To make a 20-3024 Multi-Pak Interface work with both a CoCo 1/2 and a CoCo 3 requires a piggybacked PAL/GAL with a switch to activate one or the other. I'm sure someone can figure out some circuitry to switch the 20-3124 type Multi-Pak Interface.

Barberd: /* Video */

2021-04-18T20:10:17Z

Video

← Older revision		Revision as of 16:10, 18 April 2021
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	=Video=		=Video=
	*[https://www.youtube.com/watch?v=Hs2nL3tir9Q YouTube Atarileaf] Package Video November 1, 2010
	*[http://www.youtube.com/watch?v=Hs2nL3tir9Q YouTube Atarileaf] with a joke about MULTI-PAK in the movie ''The Fifth Element''		*[http://www.youtube.com/watch?v=Hs2nL3tir9Q YouTube Atarileaf] with a joke about MULTI-PAK in the movie ''The Fifth Element''
	*[https://www.youtube.com/watch?v=zy8WdMEAF5Y Custom Multi-Pak YouTube Tom] Interface for the Tandy Radio Shack Color Computer

	=Mod=		=Mod=

Barberd at 20:08, 18 April 2021

2021-04-18T20:08:13Z

← Older revision		Revision as of 16:08, 18 April 2021
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	Besides the two that provides [http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/MPI%20PAL.html Cloud-9 hardware Upgrade PAL Multi-Pak], but you have to send the MULTI-PAK.		Besides the two that provides [http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/MPI%20PAL.html Cloud-9 hardware Upgrade PAL Multi-Pak], but you have to send the MULTI-PAK.

	The disk controller must be used in slot 4, and while you can use		The disk controller must be used in slot 4, and while you can use two disk controllers in the Multi-Pak Interface, problems exist as their addressing may conflict. This may be worked-around in some software.
	~~[http://www.coco3.com/community/2011/03/2-disk-controllers-in-the-mpi~~ two disk controllers in the Multi-Pak Interface], problems exist.

	=Links=		=Links=

Barberd at 20:04, 18 April 2021

2021-04-18T20:04:03Z

← Older revision		Revision as of 16:04, 18 April 2021
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	Neither setup is stable with the other CoCos. That is, once you upgrade to the CoCo 3 address set, your CoCo 1/2 will be unreliable with that Multi-Pak Interface.		Neither setup is stable with the other CoCos. That is, once you upgrade to the CoCo 3 address set, your CoCo 1/2 will be unreliable with that Multi-Pak Interface.

	[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/05/26-3124-mpi-coco-3-upgrade-1/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #1]<br />		[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/05/26-3124-mpi-coco-3-upgrade-1/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #1 (add in a 74SL10 chip to limit the address range)]<br />
	[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/06/26-3124-mpi-coco-3-upgrade-2/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #2]<br />		[https://web.archive.org/web/20140814204443/http://www.coco3.com/community/2010/06/26-3124-mpi-coco-3-upgrade-2/ 26-3124 Multi-Pak Interface CoCo 3 Upgrade #2 (program and add in a new GAL chip to replace the logic of the PAL)]<br />
	[https://web.archive.org/web/20091027042408/http://www.geocities.com/idezilla/CoCoZilla/patchmpi.html 26-3024 Multi-Pak Interface CoCo 3 upgrade By Robin W. Drake]		[https://web.archive.org/web/20091027042408/http://www.geocities.com/idezilla/CoCoZilla/patchmpi.html 26-3024 Multi-Pak Interface CoCo 3 upgrade By Robin W. Drake (add in an 74SL10 chip to limit the address range)]

	Besides the two that provides [http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/MPI%20PAL.html Cloud-9 hardware Upgrade PAL Multi-Pak], but you have to send the MULTI-PAK.		Besides the two that provides [http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/MPI%20PAL.html Cloud-9 hardware Upgrade PAL Multi-Pak], but you have to send the MULTI-PAK.
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	=Mod=		=Mod=
	A 74SL10 chip is used to provide 3 NAND gates that ~~will effectively remap~~ addressing ~~for~~ the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip and run wires to the appropriate points to provide the logic needed, with one pin of the PAL redirected from its normal path. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):		A 74SL10 chip is used to provide 3 NAND gates that when combined as described limit addressing to not include the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip and run wires to the appropriate points to provide the logic needed, with one pin of the PAL redirected from its normal path. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):

	[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]		[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]

Barberd: /* Mod */

2021-04-18T19:59:43Z

Mod

← Older revision		Revision as of 15:59, 18 April 2021
Line 49:		Line 49:

	=Mod=		=Mod=
	A 74SL10 chip is used to provide 3 NAND gates that will effectively remap addressing for the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip and run wires to the appropriate points to provide the logic needed. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):		A 74SL10 chip is used to provide 3 NAND gates that will effectively remap addressing for the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip and run wires to the appropriate points to provide the logic needed, with one pin of the PAL redirected from its normal path. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):

	[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]		[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]

Barberd: /* Mod */

2021-04-18T19:49:48Z

Mod

← Older revision		Revision as of 15:49, 18 April 2021
Line 49:		Line 49:

	=Mod=		=Mod=
	A 74SL10 chip is used to provide 3 NAND gates that will effectively remap addressing for the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip ~~(unless by design)~~ and run wires to the appropriate points to provide the logic needed. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):		A 74SL10 chip is used to provide 3 NAND gates that will effectively remap addressing for the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip and run wires to the appropriate points to provide the logic needed. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):

	[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]		[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]

Barberd: /* Mod */

2021-04-18T19:49:12Z

Mod

← Older revision		Revision as of 15:49, 18 April 2021
Line 49:		Line 49:

	=Mod=		=Mod=
	The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip (unless by design) and run wires to the appropriate points to provide the logic needed. The points differ for the 26-3024 and 26-3124; both ~~modification~~ outlined here (and in above links):		A 74SL10 chip is used to provide 3 NAND gates that will effectively remap addressing for the overlapping regions of memory. The 74LS10 can be mounted on top of another chip to provide provide power and ground, attaching pins 7 & 14 with pins 7 & 14 of the mounted chip. Bend out the other pins to not touch the underlying chip (unless by design) and run wires to the appropriate points to provide the logic needed. The points differ for the 26-3024 and 26-3124; both modifications outlined here (and in above links):

	[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]		[[File:MPI Mod for coco3.JPG\|MPI Mod for coco3]]