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DAre you asking specifically about an alternate 4mb flash chip? -The earlier boards used the 1mb flash chip (M27C801-100F1) -The last...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.Thanks for confirming that part number. I could only see part of a number in a blurry pic but that was enough to confirm a match with...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.I've sucessfully tested erasing and programming the flash memories in-circuit using my service firmware. I verified this on both flash...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.For what it's worth I've confirmed that the 4.0b firmware and language data in both flash chips are identical with each other and with...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.I've been working on a small standalone service firmware for diagnostics/repair. One interesting discovery is that the 2 flash chips...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.Wow, I actually finished what I set out to do in post #32. My new modded firmware (only 11 overwrites + 24 bytes of new code!) does...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.SUCCESS! I've successfully tested a firmware mod that adds a new feature to my OmniProII panel! Still very early lab prototyping but...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.While waiting for parts to build a ROM emulator I've been doing deep dives into the firmware. I've found non-standard things that cause...
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Ddan_n replied to the thread Master code lost.You can also do this on a flash firmware board by removing jumper JP10 and install an eprom chip in the socket (details here).
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Ddan_n replied to the thread HAI Omni engineer/developer thread.Here's a schematic of the EPROM jumpers described in post #16. The flash chip is completely disabled by removing the jumper, perfect if...
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Ddan_n replied to the thread HAI Omni engineer/developer thread.I've done some more OmniPro II reverse engineering after deciding to learn about the incredible power of the $5 RPi Pico2's programmable...
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