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Tag Archives: PCjr
Putting the things together, part 2: MIDI and other problems
Remember a few months ago, when I explained my approach to playing VGM files? Well, VGM files are remarkably similar to Standard MIDI files. In a way, MIDI files are also just time-stamped captures of data sent to a sound … Continue reading
Posted in Oldskool/retro programming
Tagged 8088, chiptune, demoscene, IBM, James Pearce, lo-tech, lo-tech.co.uk, MS-DOS, oldskool, PCjr, PSG, retroprogramming, Skate or Die, SN76489, sound, Tandy
6 Comments
More PC(jr) incompatibilities!
The race for PC-compatibility Since the mid-80s, there have been many clones of the original IBM PC. IBM themselves also made new-and-improved versions of the PC, aiming for backward-compatibility. DOS itself was more or less a clone of CP/M, and … Continue reading
Posted in Oldskool/retro programming
Tagged 8259A, CP/M, Creative Music System, DOS, Game Blaster, IBM, IBM Music Feature Card, IMFC, lo-tech, oldskool, PC-Compatibility, PC-Compatible, PCjr, PIC, reenigne, retro, SN76489, SN76496, Tandy, veovis
8 Comments
Putting the things together
So, over time I have discussed various isolated things related to 8088-based PCs. Specifically: Using the latched property of the 8253 programmable interval timer to be able to adjust the interval without any jitter/skew, so you can use it as … Continue reading
Posted in Oldskool/retro programming
Tagged 8088, chiptune, demoscene, IBM, James Pearce, lo-tech, lo-tech.co.uk, MS-DOS, oldskool, PCjr, PSG, retroprogramming, Skate or Die, SN76489, sound, Tandy
4 Comments
PC-compatibility, it’s all relative
Update 21-12-2015: I have updated some of the information after testing on an AT with old Intel 8259A chips, and added some extra information on EISA and newer systems. I would like to pick up where I left off last … Continue reading
Posted in Oldskool/retro programming, Software development
Tagged 286, 8088, 8259A, ASM, assembly, AT, demoscene, DOS, oldskool, PC, PC/XT, PCjr, retro, retroprogramming, timer interrupt, x86, XT
6 Comments
Just keeping it real… bugfixing like it’s 1991
As you may have noticed, the 1991 donut intro did not have any music. I did not cover it in the previous blog, but there was some music planned for this small intro. I chose to use EdLib, because AdLib … Continue reading
Just keeping it real… like it’s 1991
Last weekend, there was a special demoscene party, the 1991 party, with, obviously, 1991 as a theme. Well, that is just my bag, baby! The focus was mainly on C64 and Amiga, which were the most popular platforms for gaming … Continue reading
Posted in Oldskool/retro programming
Tagged 286, 8088, demo, EGA, intro, MS-DOS, oldskool, PCjr, raster interrupt, retro, scroller, VGA, x86
6 Comments
