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Multi-Pak Interface: Difference between revisions
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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]] | ||
Revision as of 19:59, 18 April 2021
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Home / Hardware - Multi-Pak Interface
The MULTI-PAK is a peripheral that plugs into the expansion slot (cartridge port) of the Color Computer and expands it to handle up to 4 cartridges interchangeable and can be used one at a time without having to put out one another. This exchange of the 4 slot can be done without shutting down the computer, although sometimes a reset is required. You can even do some things with several at once.
The following models exist:
- 26-3024 Grey
- 26-3024 White
- 26-3124 White
- 26-3124A White
There are also custom made MULTIPAK and 8 Slot MULTIPAK
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 the 26-3124 involves trace cutting and wiring in a 74LS10 chip to change the addresses.
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.
26-3124 Multi-Pak Interface CoCo 3 Upgrade #1
26-3124 Multi-Pak Interface CoCo 3 Upgrade #2
26-3024 Multi-Pak Interface CoCo 3 upgrade By Robin W. Drake
Besides the two that provides 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 two disk controllers in the Multi-Pak Interface, problems exist.
Links
- Multi-Pak Interface Owners Manual (Tandy)
- Multi-Pak 26-3124 for the Color Computer 2 Owners Manual
- 8-slot-mpi-multi-pak-interface-design
Video
- YouTube Atarileaf Package Video November 1, 2010
- YouTube Atarileaf with a joke about MULTI-PAK in the movie The Fifth Element
- Custom Multi-Pak YouTube Tom Interface for the Tandy Radio Shack Color Computer
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):
Detail for 26-3024:
Detail for 26-3124:
