The other two models had to have a fairly simple mod done) (Only the 26-3124A was ready to be used with a CoCo 3 due to the change in the CoCo 3's addressing. Slotpak III (Chris Hawks/Howard Medical).CX-P1 Color Computer Expansion Interface (General Automation) cocoman3.Tandy made three basic models of the MPI, while other manufactures made their own versions as well. It offered four slots for cartridge devices either hardware or software selectable. The Multipak Interface (MPI) was a device used for bus expansion on the Color Computers. Due to this, several devices listed below, i.e.: X-Pad, cannot be used on a CoCo 2 or 3 without a Multipak Interface, which does produce the 12 volts DC required. The CoCo 2 & 3 do not produce 12 volts DC. The CoCo 1 cartridge port is slightly different, in that it offers -12 volts DC on pin 1 and +12 volts DC on pin 2 (from the Color Computer Technical Reference Manual (Tandy).pdf file available here): The attached image shows the pin out of the CoCo 2 & 3. There are two variations of the cartridge port on the Color Computer lines.
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