Denial

Due to some bugs in the assembler, I'm switching from Quetzcoatl to cc65 (ca65). Anyway I am not able to produce an executable that I can load in VICE. The problem is that the "a.out" executable file is missing the two byte address at the start of the file that makes it loadable with "...

I've made a 3-frame animation of what the white trimmer does on the image, for those who wants to see its effects without touching the real machine: http://i23.photobucket.com/albums/b380/nippur/vic_trimmer.gif Another interesting thing to note is that the factory position of this trimmer looks to b...

does anybody knows how to read the state of the "data" bit from the tape interface? I haven't found it explained in the reference guide nor in the other docs I have. I understand the VIA chip has to be programmed but don't know how. I need to play with tape signals and I want to write a so...

A long, long time ago I scrapped a VIC-20 with the same promblem only to find out years later that it was a NTSC machine.

I just fixed it, thank you, see my other post "interesting motherboad trimmers":

http://sleepingelephant.com/v-web/bulle ... php?t=1384

Is there any schema for this cable? I would like to build one. I suppose I have to shortcircuit the sense pin so to simulate the "pressed play on tape".

I wonder also where I can find the tape female connector... I don't think it's standard.

What mp3 codec did you use, and what MP3 specific settings did you use with your codec? I used the one that comes with Nero CD Burning program, it's called mp3pro but I kept turned off the "pro" option (which produces evens smaller files). I used also the "fast" compression opti...

I've tested the possibility to load from cassette a program that has been previousy recorded on tape from an mp3 source (one application of that would be loading programs from a portable mp3 player). I converted a test program into Wav format with WAV-PRG, then I opened it in a wave editor and saved...

I've found what the the two trimmers located near the VIC chip do! My VIC-20 didn't diplay colors so I dared to open it and change the trimmers in the hope to fix the problem (I had read a previous message about that, but the author didn't specify which trimmer was to be changed). Near the VIC chip ...

I wonder if there is a cable for the tape interface with an audio jack plug so to connect an mp3 or cd player to the Vic 20. That would be a very convenient way of loading programs, with no errors and possibility to choose the tracks/programs on the fly. Is that in theory possible? I started to conv...

I have a working Vic-20 which shows sharp images but no color at all (grayscales). Is it the VIC broken? Or could it be the RF modulator? All the rest is working perfectly. I've read in a previous post (this one: http://sleepingelephant.com/v-web/bulletin/bb/viewtopic.php?t=393 ) that there is a tri...

PS- Am I the only italian here? you're not ! that's me too :-) I am another italian who bought the Vic in 1984, (at age 12). I used to buy "Program" and "Playgames" magazines, but as you have said, there were just pirated programs with name changed. Their only addition was the m...

I am going to add sound effects only, no music for the moment. Nonetheless I don't want the game "freeze" when the effect is on, so I was thinking to link to IRQ. Basically I need 3 or 4 effects: 1 for piece move/rotate, 1 for piece drop, 1 for line complete and one for "game over&quo...

I've investigated more on the Vice shift-key bug. It appears to be more evident with the left cursor key. Indeed, if you quickly press on the pc keyboard the sequence left, up, left, up, ... the cursor on the emulated screen describes instead a right-up diagonal. I should mention that I use an itali...

thank you for the code snippet, it clears all the confusion in my mind :) As for the Vice bug I mentioned before, I was referring to the fact that sometimes left arrow on pc keyboard produces "cursor right" on the vic20 emulated screen. This weird behaviour is annoying me because occurs ve...

very good with the new speed and the graphic characters I've noticed that the cursor doesn't move in diagonals (at least in Vice), is that intentional ? I would suggest to change the white/cyan screen color, it looks too "standard" to me (perhaps use one of those extendend color from 8-15 ...