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Maintenance / Re: Enterprise 64 dead
« Last post by neurox on 2024.May.01. 14:24:05 »Small, fruitless update:
Just tested with a couple of other brand new CPUs from a trusted supplier, as well as with the myriad of EPROMs I made while testing with Zozo a while back.
Same result - black and white bars. If I remove one memory chip, I get black and red bars. Another, and I get black and green bars. No sound.
CPUs tested:
- Zilog Z84C0006PEG (original)
- Zilog Z84C0006PEG (brand new)
- Zilog Z84C0010PEC (brand new)
ROMs tested:
- EXOS 2.1
- "TEST1"
- "TEST2"
- "REGTEST"
- "VRAM"
- "VRAM TEST"
(I seem to recall one of them being the beep-test)
Memory chips are KM4164B-12-227C.
Just tested with a couple of other brand new CPUs from a trusted supplier, as well as with the myriad of EPROMs I made while testing with Zozo a while back.
Same result - black and white bars. If I remove one memory chip, I get black and red bars. Another, and I get black and green bars. No sound.
CPUs tested:
- Zilog Z84C0006PEG (original)
- Zilog Z84C0006PEG (brand new)
- Zilog Z84C0010PEC (brand new)
ROMs tested:
- EXOS 2.1
- "TEST1"
- "TEST2"
- "REGTEST"
- "VRAM"
- "VRAM TEST"
(I seem to recall one of them being the beep-test)
Memory chips are KM4164B-12-227C.