Denial

It means that we have 900 lurkers who have posted less than 13 times (check the membership list by post amount decending and see for yourself) :roll: But I guess 900 lurkers is still better than no one visiting :wink: Shem you're in the top 38 of 1000 posters though 8) I must admit, It's been over ...

As far as I know, the VIA chip can be programmed to trig interrupts on either raising or falling edges on the CA/CB pins. I think the normal tape transfer uses only one of them, but maybe it would be possible to toggle from raising to falling after detecting a rasing edge, and the other way round. T...

About saving instructions: I think it's OK to exclude unneeded loading instruction, if you just make a comment about it. Put the instruction there with a semicolon before and make a short note. This will make it easy to change it later if needed. ;LDX #0 - X is already zero here STX $9120 or BCS awa...

I usually don't use the Kernal routines, but initially store apropriate value in $9121 to be able to read certain columns of the keyboard from $9120 (or is it the other way round? I always forget...) This is useful if you only need to check a limited number of keys, not the whole keyboard. This way ...

There were indeed some talented and experienced S.E. owners! Thanks for all the information! :D For using the whole 3k Expansion you can try : POKE643,255:SYS58232 So I must do this procedure before loading a program which expects a plain 3k expansion? It does not surprise me that the only thing add...

Hi! Just got myself a Super Expander, and I wonder if there are any major differences comparing it to a plain 3k expansion. I mean, will all programs made for 3k expansion work with the super expander? And the other way round: will all programs that I make which work with my super expander work also...

Hi! I use both an old two-prong vic and a newer cost reduced unit, with the same RF-adapter to a TV set. Sometimes, when the screen is set to black color, it starts rolling, and there's no whay to make it stable by adjusting the TV. The V-sync signal just seems to be missing! Having the problem with...

I found out that scrolling by only one line is too slow for most applications anyway. But what about 3 lines, or 5? =) However, it's encouraging to realize that there are still things to discover. These tricks are really very simple, you don't even have to have a stable raster routine to make it wo...

It must have been discovered quite recently (during the last couple of years or so) and/or kept secret by the discoverers, because I've seen a lot of programs obviously not using anyting but standard vertical scrolling. Even software made later than 2000. Do you know the name of a demo using this? A...

During the last months I've been exploring the VIC-I chip a bit, and more or less by accident I've found no less than two different ways to scroll the screen vertically by one line, instead of two lines. After searching the Internet for information on known raster tricks on the VIC-20, not finding a...

The paradox about the C64 story is that its success was heavily depending on the fact that is wasn't updated during its lifetime. Its function remained exactly the same, which made it possible (and neccessary) to release software available for all commodore owners, not just those who had the latest ...

Does all functions, like sound, floppy drive, tape (!!) etc work? I'm afraid I haven't tried tape, nor a real 1541, but 64HDD works (x1541 interface). Also sound and everything on the computer itself works. I have one original power supply with DIN contact, that kind with a power switch and a "...

The kind of adapter used for later VICs, and the C64 has 4 pins, two 9v~ pins, and two +5v/GND pins. I just made an adapter from 7-pole DIN to those japanese phono contacts commonly used to plug in auxiliary sound sources to stereo hi-fi systems (female.) Found out which pins on the DIN contact to u...

The VIC-20 wasn't my first computer (a C64 was). But ever since I heard about the machine I've been curious about it. I even bought one from a class mate in highscool for approx $10 (100 SEK, in 1994-95), but he didn't gave me a power supply or an RF-modulator, so I couldn't use it until just recent...

The decimal mode of the 6502 seems so rarely used that people have almost forgotten that it even exists. (As far as I know, no part of the VIC's operating system uses it.) But there's a quick and memory efficient way to convert large binary numbers to BCD using it. Just roll out bit by bit from the ...