This is a rare homebrew made from an EPROM Pac called the IOPac and was developed by the Montfort Brothers.  It adds 8K of on RAM to the Sorcerer and an I/O port.  Sorcerer user ExidyBoy provides this description:

"The IOPac is an INput/OUTput pac with 24 programmable input or output lines, individually or in groups of 4 or 8 bits. Similar to the EPROMPac, it can be used a double Pac with again provision for a switch between the two 8K regions. The I/O lines are memory mapped and the overhead is eight bytes of the EPROM, the rest of the 8K is yours to do with as you wish. The Pac has a standard 25 pin female plug on the outside edge. One can connect thus an extra printer, an EPROM programmer, a radio scanner etc. Price is Hfl. 155"

Thanks to Dutchacorn for the pictures and ExidyBoy for all the information about this extremely rare Pac.

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