Denial

I suppose these days a microcontroller could make an excellent 80-column display device. I understand you want a uC to read the memory and to generate the according videosignal(s)? A good idea, but possible? An idea that does work as it worked for me: I once made an interface that enabled me to con...

[quote="sjgrayI always wondered why Commodore never made a colour PET based on the 6545... seems like only a few extra parts.[/quote] They did, the C128. Just have a look how the registers are organized and you'll see what I meean. The problem with the 6845 is the way it addresses its memory, w...

Umm... are you two talking behind eachother now? Ian wants to swap his P500 for a few of Ruud's Acorn Atoms. I just PMed Ian. Indeed this is all my fault. Somehow I was convinced that he wanted a P500. Rereading the original post I see he wants to get rid of it. Sorry for any inconveniense. And I'm...

Ruud where abouts are you in the Netherlands? ... What is your swap or exchange proposal? I live in Heerlen, about 150 miles SE from Den Haag. What I want for it? I actually don't know. The collector in me screams for keeping it but I have to be real: certainly years will pass before I have some ti...

i dont own a P500, but for the love of my Commodore Collection i would want one, but im not sure what you want for it? VIC-20? I'm terribly sorry but only after rereading my text here online I found out that someone may think that I want to get rid of my P500. So for you and anyone else: I'll keep ...

carlsson wrote:Interesting hack, but for debugging breakpoints and a ML monitor running on another screen page (or emulated) probably makes a bigger difference than sitting idle, watching your buggy program run at 1/16th of its speed.

Using it already from 1986 on:
http://www.baltissen.org/newhtm/debugger.htm :)

I... I always fancied an Acorn Atom but never caught one in the wild... I own a P500, unfortunately not working, but I got it for free. I also own three Atoms and I have no idea if they are working; never found time for them and always something came between. But more important, I also own two disk...

rwv01 wrote:Hi.
I need a new power supply for my c64.
The old one is an older brick type with the minimal cooling fins
on the sides.

Why do you need a new one? I use the same one for year WO any problem.

I vaguely remember someone doing this on a C64. All I can find after a 10-minute Google search is this comp.sys.cbm post, claiming you can pull DMA low to halt the processor. It can work but if you pull the line low at the wrong moment, like handling an interrupt, your C64 will certainly crash! No ...

There are also a lot of implementation details that I am curious of, but too long to discuss here :) The sources of my compiler are written in Pascal on a PC. The compiler is now able to compile itself. First the compiler converts the Pascal program into an ASM file. My 6502 assembler converts this...

What is the best technique with the 6502 CPU to deal with subroutine parameters in a compiled language like C, Pascal or Basic? I'm "busy" with a Pascal compiler for the 6502. Pascal for MS-DOS or CP/M passes parameters to subroutines by pushing them on the Stack. Using the 6502's own sta...

Mayhem wrote:I've got a bunch of program files in P00 format... now Vice will read them fine but I'd like to convert them into PRG if possible. Any easy way?

IIRC the P00 is nothing more then a PRG but with 26 extra bytes at the start with some info.

Or do away with all the old chips and use a single 20$ FPGA (and still equip it with more RAM). And who is going to write the VHDL for this FPGA? And what about the needed (EEP)ROM (or whatever) to fill the FPGA with data? Modern FPGA's run on 3.3V and pins that are hardly to solder with a normal s...

eslapion wrote:Do you think that would be a good idea?

It depends. I have several old drives laying around with bad mechanisms. That means I already have some free PCBs and cases.

The advantage of your own PCB is that you can equip it with more RAM.

Hallo allemaal, I want to present 1541IDE8 V0.4. This is phase 4 in a project where at the end I should be able to handle IDE hard drives (HD) up to 128 GB using a 1541 as base. A problem is that the original File System (FS) of the 1541 only can handle 170 KB disks. Using the BAM technology of a 82...