Denial

The best solution would be a threefold alteration switch. The three common contacts go to the CS of each chip pair responsible for one K, the three 'ON' contacts go to the corresponding /RAMx edge connectors, and the three 'OFF' contacts should be tied high to +5 V, preferably over a pull-up resist...

Thank you people for this very valuable thread! Especially thanks to eslapion! :D I have a "naked" VIC-1210 3K RAM Cartridge PCB. I ordered an SRAM chip 32K x 8 and a few 74HCT08. With the info here I'll try to make a working 35k RAM expansion. It's exciting to experiment with those digita...

I've assembled all available info's I could find and put it in a PDF as one single Manual.
I hope this covers most questions.
http://content.wuala.com/contents/lordb ... 3MANUAL.7z

Here is a link with even more books…
http://pergrem.com/tibooks/

I really must admit that I'd be happy when instead of the TI-99, the VIC-20 was my first computer. It’s a far more "open" and hackable computer.

The TI-99/4A was my first computer. Except for the Philips G7000. In 1981 I learned programming in BASIC on it. TI Extended BASIC is a very recommendable cartridge. It's a great improvement to the original BASIC. There is also a hack for the TV modulator to connect it to a composite monitor like the...

Of course, you are right! Thanks for pointing it out.
Eventually I could have noticed the difference in the number of pins

Seems that 16Kx4 SRAM is pretty rare? But with some luck I get my hands on one or two.

Half a year ago, Eslapion donated a defective NTSC VIC-20 to tokra, who in turn sent it to me. In the last days, I found the time to repair it, and while being at it, implemented the first part of the mod as well. Incidentally, it is also a 2-prong VIC-20. The other two combinations, PAL 2-prong an...

Thank you for the source and help! It resulted in a stand-alone display routine for own purposes. (like a game etc.) The source can be assembled with ACME http://www.esw-heim.tu-clausthal.de/~marco/smorbrod/acme/ http://codebase64.org/doku.php?id=base:crossdev Picture and loader has to be in the sam...

You could check:

http://sleepingelephant.com/ipw-web/bul ... php?t=6147

http://sleepingelephant.com/ipw-web/bul ... php?t=6159

it's rather strange to see this thread revived after nearly 4 years. :) Well I read a lot of the old threads using the forum search. Let me know if it’s better for the forum to make new threads. I’m interested in BASIC extensions and one of my ongoing projects for the C64 and now also for the VIC-2...

Hi Mike, first of all my deep respect for your programs and BASIC scripts! :) I’ve read this thread and I’d love to have commented sources of MINIGRAFIK! Especially the @CLR, @RETURN, @LOAD and @SAVE parts (@ON was described in this thread earlier). I’m asking for learning purposes and eventually us...

How about using some longer flyleads (where necessary) and putting all your 'dead-bug' fixtures in the empty space on the control board - you'd then have all the mods on one board (isolated from each other, of course) which you could fix in place somewhere convenient inside the case. My next hardwa...

I have the first North American version and the second, world-wide version. Which would you prefer? Tough question, but I think the fist one would fit best in (on) this case(ing). Do you agree? A lot of love went into this hardware project -- nice!! 8) Oh yes, definitely! Despite I didn’t have a VI...

Muzz73 wrote:I still need to send you the VIC 20 name badge to make it complete. I'll send it soon.

I’d be very delighted, it would be the icing on the cake for my “American NTSC VIC-20

Just tried it on the real VIC-20 (ntsc)!
For me it woks much better this way.