joevt's latest activity
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.Another note: "Flasher (TNT 0.6)" doesn't try to detect the ROM type before flashing. It says AMD for both AMD and Intel chips...
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.It appears that "Flasher (TNT 0.6)" cannot do Intel 28F020 chips because it's looking for a device ID of DB instead of BD from 8 of the...
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.In your screenshot, the first 4 bytes of the framebuffer is 07FFFFFF hex. That is 5 zero bits (black pixels) followed by 27 one bits...
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Jjoevt replied to the thread Battery bombed Centris 650’- corrupt video out.The first line begins at offset 0 of the frame buffer. The most significant bit (bit 7) of the fist byte is the top left pixel. 32 bits...
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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?