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Apple Network Server MacOS based ROMs found
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I used kansas_deinterleave to deinterleave all the ROMs. I think most people just want ANS 2.0.
This four chip arrangement is not flashable by Apple's flash utility which expects different chips.
Also, your ROM DIMMs won't have the write enable pin wired so we can't make our own flash utility?
This four chip arrangement is not flashable by Apple's flash utility which expects different chips.
Also, your ROM DIMMs won't have the write enable pin wired so we can't make our own flash utility?
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ANS 2.0 means the first one above, "ANS Deinterleaved.zip"?
That is correct. Actually, I made a provision to enable the WP pin to all of the chips from the WP pin(s) on the DIMM. It's been 20 years since I laid the thing out. IIRC, connecting them requires installing a couple of 0 ohm resisters and maybe a wire jumper. But certainly, it would require your own programming utility, which follows the programming requirements for the HY29F800 from Hyundai or Hynix (same procedure for both). There's some theoretical discussion about programming in the large PEx thread I linked above.
My thought was to build an external programmer similar to Doug's mechanism for the Mac II family.
This is probably the first posting in that speculation: https://68kmla.org/bb/threads/pex-rom-project.23568/post-417941
And here is a later post laying out some of the solid options. Never got any further as far as building/testing hardware: https://68kmla.org/bb/threads/pex-rom-project.23568/post-418272
Yes. That's the only one with 1 MiB files.
Any reason to not connect them?
Code for flashing various chips exists in New World Mac firmware updaters (Open Firmware code), and in open source utilities such as flashrom. I have a fork of flashrom for Mac OS X.
I'll read those later. I was thinking, could the ROM DIMM have a switch to disable itself so that I can boot my Power Mac 8600 into its built-in version of Open Firmware, load firmware updating code from disk or serial port, then use the switch to enable the DIMM (bypass the built-in ROM), then run the firmware updating code? That way, I could use the Power Mac 8600 as a programmer for itself or other Macs. It would be useful for ANS since ANS doesn't have built-in ROM.
Apple flashing schematics were linked at
https://68kmla.org/bb/threads/mac-os-on-ans-modding-a-rom-dimm.51120/post-578579
Apple's flashing utility (for classic Mac OS) could be updated to add support for other chips. However, I don't think you can boot Mac OS, then disable the built-in ROM while Mac OS is running unless you disable interrupts and exceptions. So in this case, the ROM DIMM must already have a ROM that works with the Mac.