Denial

You might try loading the program with ",1,1" after the filename. If it's a machine language program that loads into a location it wasn't supposed to go, it could cause your VIC to hose up.

I would suggest checking chips again. If the rectifier was in wrong, you probably blew some chips.

I use a white lithium grease. It's just better suited for the job.

sync ldx #0 cpx $9004 bne sync+2 ldx #15 @1 cpx $9004 bne @1 ldy #9 ; 2 cycles bit $24 ; 3 cycles @2 ldx $9004 ; 4 cycles txa ; 2 cycles bit$24 ; 3 cycles bit$24 ; 3 cycles ldx #21 ; 2 cycles @3 dex ;\ (21*5-1)=104 cycles bne @3 ;/ cmp $9004 ; 4 cycles bcs @4 ; 3/2 cycles @4 dey ; 2 cycles bne @2 ;...

I am curious about this NEOS mouse, what is it?

Well, I have finally gotten back to looking at this and trying to figure out what's wrong with the code.

It turned out to be the target of a branch that was off. After 25 years, coming back to ML isn't as easy as it used to be.

If I may be of assistance, I would like to suggest taking a look at my post on 6502.org forum, which is probably a more suitable location for a discussion like this. If you are not against updating the voltage regulator circuitry with a simple switcher circuit, you can make plenty of room for added ...

Thank you Mike.

I would humbly suggest using the Software Sprite Stack from Robert Hurst and put your effort into the game-play and graphics rather than rolling your own. http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?f=2&t=3252&hilit=sss This is a proven library used in many of Roberts game...

Has anyone looked at the code for the Omega Race cartridge? Does that game use software sprites? and How do they do it? :? The reason I ask, is I have been scanning through a dissassembly of the cartridge and see no reference to the raster register. Of course I just did a quick dissassemble by trans...

However, I do not consider those improvements as an end in themselves, they need to serve some purpose. Just putting some extra RAM at some place - just because it can be done - doesn't cut it for me. I must agree that there must be a method to the madness. Whether I will impliment it, is another s...

I/O2 and I/O3 are generated in UC6 from the CPU address bus. VIC puts addresses on its VA bus - where also the character ROM is connected to -, but these addresses never reach the CA bus. You are correct, but you are only telling half the story. There are three 74LS 245s separating the VA and VD bu...

Providing VIC with VRAM in the range $0400 to $0FFF might be a more practical solution, than doing so for $9800 to $9FFF. I have already done that in my VIC 20 65816 project, http://forum.6502.org/viewtopic.php?f=4&t=3521 , and moved the start of basic to $600 and the screen matrix to $400. Thi...

Has anyone tried adding a 2k memory that the VIC could access at $9800-$9fff? It would seem this could be done in a similar fashion as the color ram, adding another area to place the screen matrix. Just a thought.

I just bought a 9 volt transformer that could handle 4 amps and use that.