I have a bunch of computers that I use for various projects including playing games and am running out of space or constantly swapping computers in and out of storage. Many IBM compatible games run in Tandy 16 color mode but do not support the IBM PCjr and are displayed in CGA 4 color mode. This modification allows the IBM PCjr to run many of those programs in Tandy 1000 16 color graphics mode which I hope will save me from adding yet another computer to the mix.
Tandy 1000 Graphics Mode Mod for IBM PCjr
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Posted in Upgrade |
Still a work in progress but I have it mostly working:
Apple IIe booting PRODOS from HP9133XV Floppy
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Tags: AMIGO, Apple II, GPIB, HPIB, IEEE488
Posted in Old with Old |
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.
Commodore PET 4032 Fat 40 Upgrade
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Tags: 4032, 80 Column, 8032, Fat 40, PET, TPUG
Posted in Upgrade |
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!
Dual 5.25 inch floppy drives mounted in TRS-80 Model II 8 inch floppy drive bay.
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Tags: 8 Inch Drive, CP/M, Model II, Tandy, TRS-80, TRSDOS
Posted in Old with Old |
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.
Commodore PET 4032 with IEEE-488 1541 Drive
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Tags: 1541, CBM, Commodore, IEEE-488, PET
Posted in Old with Old |
