joevt's latest activity
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Jjoevt replied to the thread Q610 VRAM issue.You're not viewing that screenshot on the same computer that took the screen shot? Can you post a copy here (convert to png using...
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.I think so. Looks like line 29 of one of the 32-bit buses. Maybe post the screenshot here so we can count the pixels. If the problem...
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.Right. There's some code that chooses between different Erase and Program methods. My emulation return 01/2A as manufacturer / device...
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.PDf[31:0] at U8 in the Quadra 800 schematics...
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.I would have to look at a schematic to know the actual names of the signals/traces. Can you take a screenshot? If the problem is not...
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Jjoevt replied to the thread What's the best Video solution for a Vintage Apple IIe in 2025?.Color fringing seems excessive. A white horizontal line should ideally not have color fringing at either end (unless a line or bit...
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Jjoevt replied to the thread Q610 VRAM issue.Does this GPU have a black and white mode? That may help identify what bits or bytes or words are bad.
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.The B&W image indicates a 32-bit bus with D29 or D28 being stuck low.
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.What is 28F020 command 30h? I don't see it in the Intel or AMD data sheets. Do flashable ROM SIMMs have extra logic to catch this command?
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.What color depth is being used in the photo? Change it to B&W so we can see which VRAM data lines are broken.
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.Did Apple reverse the order of the data bits for 8 of the 16 Am28F020 chips? i.e. D0-D7 -> D7 D0?
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found."Flasher (TNT 0.6)" expects AMD 28F020 (vendor/ID = 01,2A) or Intel 28F020 (vendor/ID = 89,BD). Since these chips are 2 Mb there are 16...
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.Working on porting B&W G3 Firmware update to ANS/TNT Open Firmware. I'll try making DingusPPC emulate flashable ROM to test that and to...
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.Should perform a test in DPPC to see if anything (exception handlers?) in ROM is accessed after Open Firmware is set-up. Can do a copy...
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Jjoevt replied to the thread 6100 Schematic?.The closest thing would be the 8100 schematics. https://www.macdat.net/repair/apple_schematics.html The 6100 and 6100 Enhanced...