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jasonsbeer / Amiga-2000-EATX

An Amiga 2000 PCB in the EATX form factor.
GNU General Public License v3.0
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U103 and U105 - Timing concern and updated BOM. #29

Closed jasonsbeer closed 1 year ago

jasonsbeer commented 2 years ago

ISSUE: Some A2000 EATX boards present a black screen when using accelerators designed for the MC68000 socket. Examples: Spitfire, TF534, TF536.

SEVERITY: High

SCOPE: All revisions.

FIX:

1) In the event you have black screen issues with this style of accelerator, you should change U103 and U105 to the 74F245. This change fixed the system of user sparxUK, as discussed on Discord.

2) Change the schematics and silkscreen to indicate this change for all machines in the next revision.

3) Change the BOM to 74F245 logic at U103 and U105. This change will be implemented immediately.

OTHER COMMENTS: 74AHCT245 will likely work as well, but has not been specifically tested.

jasonsbeer commented 1 year ago

Changed to 74AHCT245 in Rev 3.0.