Still a work in progress but I have it mostly working:
Archive for December 2010
Originally Published: 11-29-2009
If you have a Commodore PET 4032 with a 12″ display you may be able to convert it to an 8032 by adding a few TTL chips, 2114 SRAM chips and moving some jumpers. Here I’ve explained what I did to upgrade mine and have provided for download the updated ROM needed to use the graphics keyboard in 80 columns.
Originally published: 7-6-2009
Lacking 8″ media and having a desire to bring this old TRS-80 back to life I’ve non-destructively modified it to accept dual 5.25″ floppy drives. Now booting Pickles & Trout CP/M and ready for other hackery!
Originally published: 07-29-2009
Have an old Commodore PET and need a disk drive? IEEE-488 drives made for use with the PET are getting harder to come by. Using a circuit found on the web I’ve converted the more common Commodore 1541 to be used on the IEEE-488 GP-IB bus.