http://www.synack.net/~bbraun/plusrom/index.html

( Rob's Post on his site )

The Mac Plus (and associated machines) have 1MB of contiguous address space around the ROM, starting at $400000 through $4FFFFF. However, the Plus ROM is only 128K in size. This project is for an adapter to allow a full 1MB ROM plugged into the Mac Plus, and a modified ROM image to utilize the extra space as a ROM disk.

Click to expand...

Just got mine from Rob, and really makes the PLUS cool. Boots up instant. Works Great!

- just pop old rom's out

- pop new unit in

- solder the 2 wires from rom to A18 and A19 legs of the cpu

and your all set!

If anyone wants to buy a Mac Plus system, with this mod already installed...

talk to bbraun.  He is desperately trying to get rid of a whole fleet of his Mac Plus machines.

I'm sure his prices are quite fair!

My ROM has - Mac OS 6.0.8 installed and some Games as well! 













heck, this rom with an older OS might even work with the Mac 128k

This one here should also work with the 512k.