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jasonsbeer avatar jasonsbeer commented on June 3, 2024

Confirmed. Pin 96 (_EINT1) is unnecessarily terminated. Pin 95 (_GBG) is not terminated, but is in the Rev 6.x Amiga B2000 design.

Issues/Observations:

  1. I am not aware of reports of Zorro 2 bus issues, so it seems devices are working as expected.
  2. Termination of _EINT1 is not of concern.
  3. The _GBG signal is a way for Buster to signal all devices on the Zorro 2 bus that one of the Zorro 2 devices owns the bus. Lacking termination on _GBG could result in signal reflections during assertion. My personal speculation is this signal is not commonly used.

Recommendation: Include fix in next PCB revision. A bodge to fix this may be applied to Rev 3.0 and earlier boards, but is not recommended unless problems are encountered when DMA Zorro 2 devices are present.

from amiga-2000-eatx.

jasonsbeer avatar jasonsbeer commented on June 3, 2024

Fixed in Revision 3.1

from amiga-2000-eatx.

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