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Even if these are the tables, it doesn't make sense to me:

This might provide the key to what is needed: https://github.com/cy384/68k-mac-rom-maps/blob/master/rom-maps/Quadra605ROM.lst.txt Line 2554: CPUIDPRODUCTLOOKUP 0xA79C0 Line 2559: DJMEMCTABLE 0xA8680

I found this helpful as well, but about DJMEMC as well: https://github.com/cy384/wombat-hacks/tree/main

Are you able to tell more details about the SIMM you used? - Number of chips - Exact type of chips

Thank you for the link. I read thru it and the linked documents. This is telling, how to implement - a customizable ROM in 475/605 and many more (I have already ordered an universal ROM and a programmer) - switch of RAM check and ROM checksum - implementing ROM disk - large RAM for Q650 Great...

E.g. https://www.ebay.de/itm/155176081322 is using KM44V16104 chips, which are 5V tolerant at data and address lines but need 3,6V max supply voltage. So they may work in a 5V system but are clearly out of specifications. Answer of the seller was: "We tested these 3.3V chips on 5V applications...

So it would be great to know, how to hack the ROM for this. From my point of view there are two options: Option1: Find all appropriate tables in ROM and add data for gestalt ID 91/96 (Maybe just copy gestalt ID 90/95) So with changing the resistors and tables in the ROM, system is expected to...

SIMM are either 5V or 3,3V. You need to know the exact typ of the chips to determine and read datasheet. In this offer the type is not readable, so you have to ask the seller. Some seller tell that 3,3V SIMM will work in 5V computer (as the 475) as well. Usually this is out of specification...

There is a place for ROM Slot in every 475/605. If no socket soldered in (the devices of kamshaft and falecore have the socket already) it can be ordered with the ROM SIMM from the seller mentioned above.

Are you able to post a foto with CPU and clockchip replaced? (Maybe prior adding the heat-sink as well) Did you swap in a 68040RC25 and overclock it to 41Mhz?

Based on the website https://ko-fi.com/s/0aa02cfb63 the offered ROM fit into SE/30, IIx, IIcx, IIsi, IIci, and IIfx, Q700/900/950 Q610/650/800 LC475/575/Q605 LC630 & IIvi/IIvx/Pf600 Set Top Television Box 2MB ROM Q840AV LC III is not in the list but LC 475 (the device kamshaft owns) There are...

The ROM: Advantages: You can change the ROM: - Get rid of the time consuming memory check an each startup - Change Startup sound and Icons - Change wait states and refresh cycles for RAM In addition to that you can get an emergency start Volume, similar to recovery CD that is able to start and...

Pretty much the same configuration I have (except that I already have BlueSCSI) You are a lucky one as the ROM socket is already there. So you can add a custom ROM: 4MB https://ko-fi.com/s/0aa02cfb63 8MB https://ko-fi.com/s/2bee7a6f82 The 4 MB might be "In-system" programmable in future if...

What I found right now: When starting up the system, BYPASS(14) pin is going down to -5V within a second an return to 0V within a few seconds. Afterwards there are only signals of about 50mV which I assume to be cross talk (see attachment). No difference when playing a sound. There are Bypass...

Thank you very much for the warm welcome and the kind reply. Replacing them one by one is not a big issue. Just increasing the spare parts box a little. Just interesting if someone know, what "Bypass" is doing.

BypassTP(14) is not connected to anything else than a testing point. Nor is Bypass(14). So it might be that C149 is decoupling the testing point and C150 smoothes the voltage at the testing point. If this is the only function, C149 and C150 can be 47µF or 100µF of missing at all in normal...

Dear all, I am currently starting to recap my LC475 main board, right in time as neiter battery nor caps are leaking yet. It is already decided that I will use ceramic capacitors. As I am able to order them in 20x lots I am thinking about to replace all of them by 100µF 50V. As long as they...