Pincoder Diagnostics Inc. Version 2020.06.23.0506

ROM NAME
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04-ram-IC13 (Williams sys6a)



PURPOSE
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This ROM tests the READ and WRITE capabilites of the following chip:

    * Schematic name: IC13

    * Address range: $0000 to $007F

    * Data bus mask: $FF


    NOTE: If this test fails and you are running this test on a system 7 board that has been
    correctly jumpered to run a system 3-6a board then keep in mind that the results from
    these .bin files will still be valid however due to the design of the system 7 board this
    test is unable to determine WHICH ram chip is actually faulty. In this case either replace
    BOTH ram chips, or jumper the board as a system 7 and run the ram tests using the sys7
    .bin files in order to correctly determine WHICH ram chip is faulty. You do not need to do
    any of this if all of the ram tests pass.

Depending on your installed processor and CPU board jumpers, this check will test different
components.

    * For Boards with 6802 processor (J1 Removed and R4 Installed): Tests INTERNAL RAM on 6802
    CPU

    * For Boards with 6808 processor (J1 Installed and R4 Removed): Tests IC13 RAM

This is because 6802 CPUs have an internal 128 bytes of RAM, while 6808 CPUs do not.

Therefore if you have a 6802 CPU and this test fails (but otherwise the 6802 is good) then you
can keep using the CPU chip and install IC13 (if you happen to have one). In this case install
J1 and remove R4.



PROCEDURE
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While this test is running observe the LEDs on the MPU board. Test repeats once for each
flash.  You can gently wiggle the chip in its place while the test is running. If you get
different results then you should check the solder connections on the chip socket and/or
replace the socket.



EXPECTED RESULTS
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Positive: Top LED flashes. You can move on to the next test.

Negative: Bottom LED flashes. One or more memory locations inside the chip is bad.
See above to determine which chip to replace (6808 CPU or IC13 RAM).

Pincoder Diagnostics Inc. Version 2020.06.23.0506
