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by Mike
Sun Nov 12, 2017 12:07 pm
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 108
Views: 1928

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

Should be able to get onto building the VGA generator very soon. As soon as you've settled upon a given screen dimension (width x height), memory layout and pixel definition (direct to DAC or palette), just call out for a converter. When you aim to improve upon my VFLI images, I want my share at th...
by Mike
Sun Nov 12, 2017 10:47 am
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 108
Views: 1928

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

Brad, it's still not IO "BLock" 3 - just I/O 3. No use in inventing new names for old things - this only leads to confusion. The BL oc K signals refer to the VIC-20 schematics as they are produced by the '138 UC5 and which select all eight 8 KB ranges as seen by the CPU. BLK0 accesses (mai...
by Mike
Sat Nov 11, 2017 10:19 pm
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 108
Views: 1928

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

Please don't mix up BLKx and I/O x designators. The select signals BLK1, BLK2, BLK3 and BLK5 on the cartridge connector map to $2000..$3FFF, $4000..$5FFF, $6000..$7FFF and $A000..$BFFF respectively, and I/O 2 and I/O 3 map to $9800..$9BFF and $9C00..$9FFF. There's no such thing as "I/O Block-3&...
by Mike
Sat Nov 11, 2017 5:38 pm
Forum: Hardware and Tech
Topic: My first try at EPROMs
Replies: 39
Views: 446

Re: My first try at EPROMs

Floopy wrote:What would you use 2K eproms for?

2732 EPROMs hold 32 kbit ^= 4 KB. That's entirely sufficient to store a small homebrew on cartridge, like I did with TRON Light Cycles.
by Mike
Sat Nov 11, 2017 4:09 am
Forum: Collecting and History
Topic: One VIC-20 Release for Zoo 2017 ...
Replies: 5
Views: 215

Re: One VIC-20 Release for Zoo 2017 ...

tonyrocks wrote:I love new VIC demoscene stuff!!!

Just the so-called 'sceners' consider themselves as being too 8) to post here in Denial.
by Mike
Sat Nov 11, 2017 3:29 am
Forum: Hardware and Tech
Topic: Dead as a Dodo
Replies: 8
Views: 206

Re: Dead as a Dodo

Did you check the fuse of the power supply?
by Mike
Sat Nov 11, 2017 3:14 am
Forum: Hardware and Tech
Topic: My first try at EPROMs
Replies: 39
Views: 446

Re: My first try at EPROMs

eslapion wrote:Last time I checked, 2732 EPROMs were as rare as hen's teeth.

:lol:

I got confused with the C64 CG which has one /CS active high and another one active low.

http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=8448&start=9
by Mike
Sat Nov 11, 2017 2:38 am
Forum: Hardware and Tech
Topic: My first try at EPROMs
Replies: 39
Views: 446

Re: My first try at EPROMs

[...] The original VIC-20 character generator is a 2332 which uses 2 different independent chip select lines. Definitely the most complicated to replace and it usually requires an EPROM along with a logic gate. [...] Nothing complicated about that. /OE and /CS of a 2732 with an adapter socket do th...
by Mike
Fri Nov 10, 2017 12:55 pm
Forum: Programming
Topic: MINIGRAFIK lineart
Replies: 9
Views: 174

Re: Re: MG lineart - Castles

For exactly those scenarios: either a member of the audience possibly doesn't know about MINIGRAFIK at all or does not know what it is supposed to do and how to use it , or a client program is working and the programmer wants to automatise the 'start-up procedure' of MG for a release, I have provide...
by Mike
Wed Nov 08, 2017 11:14 am
Forum: Programming
Topic: Cart Image Confusion
Replies: 5
Views: 122

Re: Cart Image Confusion

BTW, there's nothing "secret" about the A0CBM signature, as it's usually called.
by Mike
Mon Nov 06, 2017 3:50 pm
Forum: Collecting and History
Topic: One VIC-20 Release for Zoo 2017 ...
Replies: 5
Views: 215

One VIC-20 Release for Zoo 2017 ...

... Zodiac Vitro by Triad:

screen.png

The demo features some nice rasterbars, a plasma, credits, greetings - and a tune that curiously reminds me of "The Last V8" on the C64 (just heavily de-tuned). :mrgreen:

Download (unexpanded, PAL only) below as found on pouët.net:
by Mike
Sun Nov 05, 2017 5:47 am
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 108
Views: 1928

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

You could inflate the display buffer though to contain the whole signal including the SYNC pulses and keep the complicated arithmetic out of the display loop. Heck, even a ZX81 managed to output video by just using the CPU and a parallel-to-serial-converter in the SCL ULA chip. ;)
by Mike
Sat Nov 04, 2017 3:11 pm
Forum: Programming
Topic: ?FORMULA TOO COMPLEX
Replies: 11
Views: 270

Re: ?FORMULA TOO COMPLEX

Thank you for the hint - here's a working link:

https://cid-05ef0a8eae2a4f4a.onedrive.live.com/self.aspx/.Public/denial/games/victoria.zip

I'll also repair the link in the OP and the announcement thread. :)
by Mike
Sat Nov 04, 2017 1:06 pm
Forum: Programming
Topic: ?FORMULA TOO COMPLEX
Replies: 11
Views: 270

Re: ?FORMULA TOO COMPLEX

That's fair enough. Just two things I'd like to point out: 1. Ideally, an implementation of "MID$()=" shouldn't need any more temporary stack space than necessary for the RHS expression. The exchange of the string content LHS can operate in-place. 2. GC, as bad as it's implemented in BASIC...
by Mike
Sat Nov 04, 2017 1:04 am
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 51
Views: 803

Re: 6561 Die Shot Reversing Explorations

What if we extended Kakemoms question to the other three colours? They all come from control registers. Has anyone tried changing those mid character? I'm guessing someone has. Has been done, yes, and works ... In the die shot, they look like they're read from the control registers on every pixel. ...

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