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05/27/10: 26-3124 MPI CoCo 3 Upgrade #1 by gimechip, | Tags: | Category: General | Comments are closed

26-3124 MPI CoCo 3 Upgrade #1

CoCo 3 Upgrade for the 26-3124 Multi-Pak Interface #1.
This is a schematic illustration of the CoCo 3 upgrade for the 26-3124 (small white) Multipak Interface (MPI). As you can see, the upgrade procedure is relatively simple. After this modification is applied, the M.P.I. data buffer is limited to the address range of $FF40-$FF7F as well as CTS* and SLENB*. All that is needed is a 74LS10 Triple 3-Input NAND, a spot of solder and some Kynar wire-wrap wire. This upgrade performs in an identical fashion to the Tandy MPI upgrade. Note that if you have a 26-3124A (note the “A”), then no upgrade is needed. Don’t forget a .1uF ceramic disc capacitor across the Vcc and GND of the 74LS10. Hopefully this will be of use to some. -John of GIMEchip.com

http://www.GIMEchip.com/

CoCo 3 Upgrade for the 26-3124 Multi-Pak Interface #1

Comments are closed.