Mac 512ke ram expansion

[tf 85e3]

Has there been a project that has made a 4 mb ram upgrade like the mac rescue for the 512k

 

[68kPlus]

Not that I'm aware of. Worth investigating though!

 

[Nixontheknight]

if there is, I think it would only work with ED/512ke/Plus roms

 

[tf 85e3]

if there is, I think it would only work with ED/512ke/Plus roms

Yea ive got a ke too

 

[Golden Potato]

I’ve been working on a mod to upgrade my 512K (which has 512Ke ROMs, disk drive, and an 1980s aftermarket SCSI adapter) to 4MB. I tried breadboarding it, but of course that didn’t work, and it’s a total nightmare to troubleshoot. I’m now planning on going straight to laying out a PCB to prototype it instead. In fact, I’d really like someone else with decent knowledge of Mac memory addressing to review my schematic before I go through all the trouble.

I’ll start my own thread and link to it back here.

 

[Golden Potato]

Here’s a link to the build thread I started:
'Early Macintosh home brew 4MB memory upgrade board development'
https://68kmla.org/bb/index.php?thr...w-4mb-memory-upgrade-board-development.47308/