-
Recent Posts
Recent Comments
Archives
- May 2023
- April 2023
- February 2023
- January 2023
- December 2022
- November 2022
- September 2022
- August 2022
- June 2022
- May 2022
- March 2022
- January 2022
- December 2021
- December 2020
- November 2020
- October 2020
- August 2020
- June 2020
- May 2020
- February 2020
- December 2019
- October 2019
- September 2019
- August 2019
- July 2019
- May 2019
- March 2019
- January 2019
- May 2018
- April 2018
- March 2018
- February 2018
- January 2018
- November 2017
- October 2017
- May 2017
- March 2017
- February 2017
- January 2017
- December 2016
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- September 2015
- August 2015
- June 2015
- April 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- April 2014
- March 2014
- February 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- September 2011
- August 2011
- July 2011
- June 2011
- May 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- January 2009
Categories
Meta
Tag Archives: Tandy
The myth of the vertical retrace interrupt
This is a draft from March 18th, 2019. We’re slowly cleaning out the backlog. The few remaining drafts are going to take more time to work into an article though, as actual code or configuration is required to work out … Continue reading
Posted in Oldskool/retro programming
Tagged EGA, IBM, interrupt, IRQ, IRQ2, IRQ2/9, IRQ9, PCjr, raster interrupt, Tandy, Tandy 1000, vertical retrace, vertical retrace interrupt, VGA, vsync
2 Comments
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
9 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
12 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
8 Comments
Scali's OpenBlog™ 