Does Not Compute - Sumlock Compucorp 320G

Forum Link here with Schematics. Many thanks Tony https://www.vintage-radio.net/forum/s... These Compucorp machines measure 9 inch high, 5 1/8 inch wide, and 2 ¼ inch thick, and weigh approximately 3.5 pounds. The machines can be operated off of four D-size batteries - NiCad rechargeable batteries were specified but the machines could be run off of D-size alkaline batteries if necessary. An external AC power supply was included that provided approximately 1.3 Amps current at 7 Volts DC to the calculator (the manual specified, however, that the AC supply was not to be used if non-rechargeable batteries were installed in the calculator). The machines utilized a 16-digit Burroughs Panaplex II, planar orange neon-type display. A foam-lined hard case was provided to store the calculator and power supply. The Monroe calculator company also sold many of the same models under their own label. The Monroe machines had exactly the same model numbers as their Compucorp counterparts. T The internal construction of the various Compucorp models is virtually identical, except for the later Model 326 (which is similar). Compucorp designed a general-purpose set of integrated circuits and printed circuit boards PCBs) for the machines, and used different Read-Only Memory (ROM) and amounts of Random-Access Memory (RAM) depending on the functions of the machine. The machines were designed much like a computer, with a processor section, memory section, I/O section, and power supply. In fact, on the rear label of the machines, they were called "Compucorp Micro Computer".There are five printed-circuit boards in a "sandwich" arrangement. From the bottom, they are: power supply, Memory, Processor, Keyboard/Display interface, and display PCB. The circuit boards are connected together by an arrangement of phenolic blocks with conductive fingers that wrap around from one side of each block to the other. This arrangement provides connectivity from the card-edge connector fingers on the top of each PCB to the fingers on the bottom of the PCB above it. The top phenolic block is specialized to provide support for the Panaplex II display module, and has brass tapped inserts at each end and in the middle. Three long screws are inserted through the stack of phenolic blocks and screwed into these inserts, using this arrangement to hold the stack of PCBs together.The top PCB (below the display module) is the keyboard & display interface board. This PCB for the model 360 is shown in the photo above. The PCB for the model 344 is virtually identical. The calculator's keyboard is connected to one side of the PCB by a long, wide ribbon cable. Two 40-pin Large-Scale Integration (LSI) ICs made by Texas Instruments are located next to the ribbon cable, and provide the keyboard scanning/multiplexing and display multiplexing functions. The IC closest to the ribbon cable is TI part number TMC1869NC (also marked TLC02), and is probably the keyboard scanner. The IC to the left is TI part number TMC1864NC (also marked TLC08), and is probably the display multiplexer, as the driver transistors are connected to it. A number of individual transistors are located between these ICs and the card-edge connector fingers to provide the high-voltage drive for the digit positions of the Panaplex II display module. Two 16-pin ICs are likely the segment driver devices for the display. the processor board use four, 40-pin LSI ICs as the main processor for the calculator. From left to right in the photo, the model 360 processor board uses four Texas Instruments ICs with part numbers TMC1872NC (also marked TLC07, date code 7230), TMC1866 (also marked TLC06, date code 7233), TMC1867NC (also marked TLC05, date code 7230), and TMC1870NC (also marked TLC04, date code 7231). The PCB itself is marked with part number 0140897A. The model 344 processor board uses four ICs made by American Microsystems Incorporated (AMI), with part numbers C1816 (also marked ACL07, date code 7323), C1817 (also marked ACL06, date code 7335), C1819 (also marked ACL05, date code 7335), and C1818 (also marked ACL04, date code 7335). T