Mike's PCjr Page

As mentioned in my edit of the original post, here's release 1.5 -- which should clear up PcJr. issues, and if not this version comes with the pakut1Jr.exe which tries to use the 160x200 graphics mode. The normal paku.exe is the preferred method of running it, but for Jr. or Tandy owners who do see ...

and verify everything by actually timing the execution of the code. TRUTH there. Switching around the order in which things are done and switching general register commands to use the accumulator where possible, even with the MOV and extra bytes often turns up faster on a real 8088 when the 'math' ...

This: mov dx,[bx+NUM] 8+9=17c 3b ; "NUM" being the offset in the loop lodsw 16c 1b and al,dh 3c 2b or al,dl 3c 2b stosw 11c 1b doesn't make any sense... or I'm not following how that would work at all... Cloning DI to BX seems kinda pointless and a disp+offset is 9 while as just the disp i...

I like the online copy:
http://www.phatcode.net/res/224/files/html/index.html

But phatcode's got a whole directory full of useful information, in downloadable html/PDF and online HTML format.

Certain PIO disk devices, software controlled refreshes and polling on non-DMA computers (Jr/1k) -- they can often crash if you don't call it soon enough/often enough or spread out enough. For my uses usually adding that much logic to my ISR doesn't help a whole lot either -- doesn't leave enough CP...

I don't follow you; can you explain this a bit more? Why would a non-power-of-two divisor make it not accurate? Because it doesn't divide evenly into the 18.2 whatever times a second the system clock expects it to fire. You have overflow/rounding differences with non power-of-two values. Even with ...

If you download the drivers from the link and look at how it works, it really only relies on two files for DOS; DRIVLOAD.COM which is a common way to load drivers into RAM after config.sys and EGIDE100.SYS -- which together barely break 60k, so the driver size thing shouldn't be an issue. You load t...

There are zero changes to the graphics subsystem between the last alpha executables and this version that would result in that... no clue. The paku.exe from this archive worked for you, correct? http://www.cutcodedown.com/retroGames/alphaEXE/PAKU1_34.RAR If so then there's something REALLY wrong as ...

New release, version 1.4 should resolve the joystick issue on the Jr. I've basically just split up where the joystick is called to be around the game logic instead of next to each-other, adding enough delay for the interface to 'stabilize' between reads. This also moves one of the reads to a spot wh...

I'm a little surprised to hear Jr. users use dos 3 given the lack of hard drives needing large partitions. Dos 2.11 is just as functional on a floppy only system for the majority of tasks and leaves you with anywhere from 11 to 20k more free. Or is Dos 2 not entirely compatible with the Jr's... oddi...