Mike's PCjr Page

Spoken like a professional programmer :) As a hobbyist programmer on the other hand, the 9900 assembly language was pretty easy to master and fit the bill for a machine that had a maximum RAM of 48K Which was only made possible by disabling half the data bus and letting the video controller handle ...

Wow ... I can't let that post go! Why on earth should I have to remember what register is good at doing what? Spoken like a C programmer :D Because JHVH forbid the next programmer to come along and deal with the code has ANY clue what registers you are using for what actions... It's a bit like the ...

Ok, the following contains two .exe's. http://www.cutcodedown.com/retroGames/alphaEXE/PAKU1_32.RAR The first, paku.exe uses the text-mode 160x100 trick and uses that $3DA port to set the blink off (in theory). This would be the preferred version IF it works. It also now writes one byte at a time to ...

Well, I would just prefer it because it's faster, and faster means more possibilities in later games as I am working on other ones using this method. I found some documentation on it -- a PDF that appears to be the "IBM Pc Jr. Technical Reference" -- pages 63-64 outline how to access $3da ...

It will indeed help -- do you have more information on what exactly is set at $3DA since I have ZERO documentation that even mentions that port? Though it's funny - I just finished porting it to the 160x200 native tandy/jr mode (though I'm drawing it as 160x100 still), though it's a hair slower due ...

Having cut my assembly teeth on the TMS9900, 8088 programming seems unnecessarily obtuse in comparison :mrgreen: All this talk about segments, the multiplicity of oddly named registers (on the 9900, you have R0 to R15 (16 bits each) ) etc... Sheesh! I always found generic numbered registers confusi...

Well, I tried it tonight and there seems to be a problem with the joystick function because joystick down works only erratically on the Jr. Are you sure you're stick is calibrated right? The number displayed with the stick centered should be roughly half that when the stick is at the bottom. If lef...

Turbo Assembler 2 has a MASM mode that's much closer to MASM1 than MASM5 is... and MASM3 is similar too -- you can find both on winworldpc: http://wdl3.winworldpc.com/Abandonware%20Applications/PC/ Of course if bitsavers wasn't 404 I'd point you at the manual for TASM2, which has a section on workin...

1.3 Is now released to the public. http://www.cutcodedown.com/retroGames/paku_1_3.rar To sum up the changes: 1) Added Joystick Support 2) Tracking of five most recent high scores 3) Saving of high scores to disk 4) New font renderer uses less memory and sped up menu. 5) Fixed bug with MCGA detecting...

Here's the link to 1.3 beta. http://www.cutcodedown.com/retroGames/betaReleases/BETA1_3.rar Those of you who were having the flashing/striping issue, please test that to see if the problem is resolved. Preliminary joystick code is included, you can attempt to activate it with the /joy command line s...