Search found 29 matches

by sjgray
Sat May 14, 2022 4:13 pm
Forum: Hardware
Topic: New Vic-20 project
Replies: 27
Views: 12263

Re: New Vic-20 project

Looks great Rich! I'm glad to see my Kicad schematics turn into a real working board! Well done!
Sorry about the transcription error. As usual I have too many project ideas and not enough time to complete them.

Steve
by sjgray
Sun Apr 12, 2020 6:49 pm
Forum: Hardware
Topic: V9958 Video for 6502 SBC
Replies: 36
Views: 5404

Re: V9958 Video for 6502 SBC

Yes, that's one solution to Steve's problem, but it's a tradeoff because it abandons the original size/performance goal. Giving up is a viable option, but it isn't the only option! As long as we're willing to use our gray matter (sorry, Steve!) I expect the problem is one that can be gainfully ...
by sjgray
Sun Apr 12, 2020 3:39 pm
Forum: Hardware
Topic: V9958 Video for 6502 SBC
Replies: 36
Views: 5404

Re: V9958 Video for 6502 SBC

Some people use vintage computers now an then! ;-)
Many vintage chips like v9958 can be found on ebay. There is one seller who makes bundles with cpu, ram, sound, and video chips for a reasonable price.

Some of the v9958 functions auto increment the vram address in order to speed up block transfers ...
by sjgray
Sun Apr 12, 2020 3:14 pm
Forum: Hardware
Topic: V9958 Video for 6502 SBC
Replies: 36
Views: 5404

Re: V9958 Video for 6502 SBC

hi all,
Since completing my SBC based on the 65C02. I've now starting work to design an Video adapter using the V9958 (as used in the MSX2 computer). I've done some web searches and it appear no one that I can find using V9958 with 6502.

My plan is to have V9958 using simple 1 or 2 SRAM chip ...
by sjgray
Wed May 01, 2019 8:22 pm
Forum: General Discussions
Topic: 20 Year Anniversary
Replies: 13
Views: 1419

Re: 20 Year Anniversary

I tip my hat to you Mike. It's a great accomplishment and I'm grateful for such an amazing resource for people. Thanks for hosting my pages and for being a good friend!

Steve
by sjgray
Mon Dec 03, 2018 1:17 pm
Forum: Hardware
Topic: TTL 6502 Here I come
Replies: 558
Views: 185031

Re: TTL 6502 Here I come

Very impressive! Great work!

Steve
by sjgray
Mon Nov 06, 2017 12:13 pm
Forum: Hardware
Topic: MOS 6509 look-alikes?
Replies: 64
Views: 45398

Re: MOS 6509 look-alikes?

Very nice! This is long overdue.

Steve
by sjgray
Wed Jun 14, 2017 1:18 am
Forum: General Discussions
Topic: PET memory mapping question
Replies: 5
Views: 1070

Re: PET memory mapping question

I'm not a PET guy (always wanted one, but couldn't afford it at the time), but we had a few at the college. They were used for data acquisition with various equipment so we didn't do any real programming of them for our classes.

I am going totally from memory, but I'm pretty sure there was some ...
by sjgray
Tue Jun 13, 2017 8:07 pm
Forum: General Discussions
Topic: PET memory mapping question
Replies: 5
Views: 1070

Re: PET memory mapping question

Hey, that's from my Editor ROM page! ;-)

So, 4000 series have 1K ram installed. 8000 series has 2K ram. Ignore the colour info obviously.
The last 4000/8000 PET motherboard revision is called the "Universal Dynamic PET" motherboard. It is configurable for either 40 or 80 columns depending on ...
by sjgray
Mon May 22, 2017 10:38 pm
Forum: Nostalgia
Topic: What was the "killer app" for the Commodore PET?
Replies: 27
Views: 12306

Re: What was the "killer app" for the Commodore PET?

So, the 8032 can be turned into a 4032 several ways.
1) You can run some software called "80240.PRG" or "80240ANYHZ.PRG". This re-programs the CRTC controller to do 40 columns and also installs a patch so that printing works properly. You can download 80240.PRG on my web page here:
http://www.6502 ...
by sjgray
Wed May 17, 2017 6:32 pm
Forum: Programming
Topic: CBM-Transfer (aka CBMXfer) Version 1.00 released!
Replies: 2
Views: 1556

Re: CBM-Transfer (aka CBMXfer) Version 1.00 released!

This week I have released CBM-Transfer 1.02. Of interest here is the addition of a code tracer, which will "run" the 6502 code, following all jsr, jmp, and branches in order to mark the code instructions. When completed it will list all the non-code (data) areas for you. It's available on GitHub ...
by sjgray
Thu May 04, 2017 1:27 am
Forum: Hardware
Topic: Emulating ROM with a one-chip ARM
Replies: 21
Views: 9320

Re: Emulating ROM with a one-chip ARM

I do occasional EPROMS for my ColourPET project. I have a MCUMall GQ-4X programmer (USB), and a real eraser. I test my code using the VICE emulator and only write EPROMS when the code is stable. I have about 10 eproms I rotate as needed and keep 5 or so BLANK so I can write any time, and then bulk ...
by sjgray
Mon Apr 03, 2017 6:13 pm
Forum: Programming
Topic: Looking for a disassembler and suitable assembler
Replies: 24
Views: 3739

Re: Looking for a disassembler and suitable assembler

I installed opencbm, and it does run now.

The options window did not come up before; it only displayed errors about missing components (I didn't record the exact error before installing opencbm).

So I would personally reword the site to list opencbm as a requirement, as the option to not require ...
by sjgray
Mon Apr 03, 2017 5:41 pm
Forum: Programming
Topic: Looking for a disassembler and suitable assembler
Replies: 24
Views: 3739

Re: Looking for a disassembler and suitable assembler

It should run without opencbm as long as you do not enable "check EXE's" in the options. Did you run the setup with administrator privileges? Are you getting error messages?
Although I extensively tested, I made a lot of changes for CBM-Transfer 1.00 and it's possible there are bugs..

We should ...
by sjgray
Mon Apr 03, 2017 5:12 pm
Forum: Programming
Topic: Looking for a disassembler and suitable assembler
Replies: 24
Views: 3739

Re: Looking for a disassembler and suitable assembler

I spent a lot of time trying to get the VB6 dependencies running on Win 7 64-bit, to no avail. Since it's such an old & afaik unsupported dependency, could you provide some instructions of how to bolt that into modern machines?

Did you try the "complete package with installer"? I have been able ...