71B MultiMod: MEMORY LOST when changing batteries?

[rprosperi]

(04-21-2021 06:28 PM)Dave Frederickson Wrote:  

(04-21-2021 05:15 PM)rprosperi Wrote:  You cannot merge multiple physical modules into a single IRAM. In fact a 64, 96 or 128KB RAM module, while able to merge into the single 'system RAM' space, are constrained to be 32KB IRAMs.

For example, if you install a 64KB RAM module into port-1, it must be 'freed' in 32K ports

Both the CMT and HHP 32k modules have a signal pin that corresponds to the Last-Chip-In-Module bit in the FRAM71 configuration nibble. It's possible to open the modules and reconfigure how the LCIM pins are connected to create RAM ports greater that 32k. There is a bug with the 1BBBB firmware and 64k ports, so be aware.

FRAM71? Did you just mean 71B config table? Maybe I'm not following you about FRAM71?

I was referring to vanilla CMT & HHP modules as sold, but yes, this can be done, if you're intrepid and have a steady hand. One of my HHP 96K modules has been so converted to 64K/32K RAM module, which is handy for mastering 64K EPROM images, though Emu71/DOS and Emu71/Win are likely just as easy to use.