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Williams, 1982You're currently viewing posts by Pinsider beaver.
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Coming late to this party. I discovered the pincoder ROMs yesterday and looking forward to using them. Thanks to the artwork by barakandl I figured it was easy to make a board with prewired perf boards. Still need to burn the 27512 PROM.
215E54F7-9746-4248-B427-DDB3492CA329 (resized).jpeg7C15D61E-AA9B-4F81-A8B8-2D2704E2C616 (resized).jpegNot sure I understand but the 27512 will allow 32 “slots”. Which one the cpu sees is selected by the DIP Switches. Pincoder’s latest combined ROM image fits exactly in the 27512.
My blog on my implementation in case it helps someone to build their own.
http://www.edcheung.com/album/album05/pinball/cpub.htm#pincoder
9FCCB059-2325-4DE3-9C6B-3A04E7B2B8D3 (resized).jpegI am having some difficulty with the blanking test (Test 02). With the standard ROMs I get a period of ~8msec on the output of IC7. But with the pincoder ROMs I get a 50 usec period. This faster rate prevents the blanking timer circuit from detecting the pulses. Anyone have this?
Quoted from pincoder:Interesting. I just tested my system 6 board and get 8.36ms on the 02-blanking test, and almost exactly that with the GREEN ROM.. What game/board are you troubleshooting?
For what it's worth, the blanking test does nothing but loop until it's time to toggle the input pin (pin 5) of IC7. then it uses an EORA to invert the correct bit in the PIA1_A register.
If your clock speed checks out then it is peculiar that the bit in the PIA register would show signs of toggle so much faster than the CPU even asks.. I can't say I've ever seen that before. Please let me know what you find
This is on a System 3. I do not know what the identity is of the other ROMs.
Note that test 1 (LEDs flash) looks like it is toggling flashing around 2hz rate.
Quoted from SYS6:System 3 & 4 boards use the 6875 for the clock generation. Might be worth looking at it to see what it is producing.
Frequency is just under 1 MHz. Both my System 3 and 4 boards look the same.
0C200399-BFEC-4C5C-9381-C10E3CD5EC73 (resized).jpegI won’t have the time this week as I will be going out of town. I also have 2019.04.07.1941 which may be a release version. I will probably cut and paste the above revision into an unused slot on my ROM.
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Westjordan, UT