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Within my LC475 there is 70ns onboard RAM and a 60ns RAM SIMM and a programmable ROM module. Due to speed reasons I like to disable the onboard RAM. Prefered solution is changing the code in ROM so the onboard RAM is no longer used. I am quite sure that I found the place in ROM that initialize...

In the Overclock LC475/P475/Q605 without soldering or spicy-o-clock thread I learned that LC475 can be pushed to the limit of the MC88920 by software, but to exceed this limit MC88920 need to be replaced by MC88916. There were some questions about availability and sources that can be discussed here.

As you may know, a LC475 lives with me. My current target is to operate that LC at 40Mhz, so I read some pages about ROM hacking and MEMC chip. From the schematic I know LC475/P475/Q605 are using programmable Gazelle clock generator chip. Based on schematic and that document I learned that...

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...

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...