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by Bill Degnan - 11/29/2015 21:34 | |
Anti-static bag inserted between rear of H217D core card on one side, and between the M930 terminator and M7261 CPU card. Since this photo was taken, the bag was cut to fit. Click image for larger view.
I tried a number of core stack cards and combinations. The issues were strangely similar even though totally different cards were inserted. For example address 13 would stick high even after all available cards swapped out. So, I decided it must be an electrical problem that I might be able to solve by inserting shielding behind the core stack and behind the CPU card. That's what you see here, an anti-static bag folded over between the cards that would most be effected by shielding problems. Worked perfectly and since the shielding was installed there have been no stuck bits. NEXT: Load BASIC via papertape? Reply |