Denial

Can someone help Perseus get this working?
It's written for a 80 column PET, but has some vague instructions to convert it for a Vic20...

http://www.mdawson.net/files/minefield80.prg
http://www.mdawson.net/files/minefield8 ... ar_Apr.pdf

It's all fixed now. The joystick routine has errors in it, which I fixed and now it works as both joystick and keyboard which the original would not do. http://www.mdawson.net/vic20chrome/vic20.php?load=http://www.mdawson.net/files/gobble/gobble.prg Just problems with Zeros and Ohs, and you need to ...

http://www.mdawson.net/files/gobble/

I noticed the first error is because you put zeros instead of oh's in an OR.
The second was an incomplete line.

Email it to me and I'll upload it to my website.

matsondawson@gmail.com

Yeh, nothing under IE9, even then IE9 doesn't support sound. Your best bet is latest Chrome, then Firefox (remember to turn off firebug if you have it installed). As for speed, I am slowly working on a faster version, I think I should be able to get at least a 5x speed up. What sort of laptop do you...

Lots of changes... * Added ***FULLSCREEN*** which is only supported on latest firefox and chrome. Thanks to whomever the vic20easterbunny is for that. * Removed hover menu system, now you have to click (I hate hovers) * Made a completely new debug screen which shows you VIC and VIA states (it's slow...

Here's the JS Vic20 link for those to lazy to download and vice it. http://www.mdawson.net/vic20chrome/vic20.php?load=http://www.mdawson.net/files/pacfollin.prg&machineType=ntsc Took me ages to figure out why it didnt' work in NTSC turned out to be the branch not taken interrupt ignoring feature...

So the plan I was going to use was an attempt at hardware assisted line drawing. By wiring (T1 ->) T2 -> shift register and other combinations you can use it as a bit shifter for the line (assuming you turn off interrupts). I think I was down to 17ish cycles a pixel ignoring setup. The thing is you ...

That's some really clean source.
Obviously a very good coder.

Looked to be a lot of hand assembly involved.
Lots more jobs in those days I guess.

Are you sure it's an 8 bit LSFR? That would have a maximum sequence of 255 values. In the VICE source it has a 1024 x 8 bit lookup (8192 bits), which suggests a 13bit LFSR. Not to say that vice is correct at all.

I guess this all depends on whether the channels still generate a wave internally when they are off.

Actually you may be able to get a little more precision doing DAC by... 1/ Assuming the four channels outputs when off sum to a relative value of 1.8 (4*0.45) once they reach the volume section, that would give us 0->27 in steps of 1.8 2/ Setting two channels 180 degrees out of phase then switching ...

They are simply added. However, with high values of the volume register and two or more voices activated, clipping might occur . I wish I could up-vote that link! It explains why you can play analogue levels by changing the volume register. Namely because "The voltage for the 0 state when stop...

Whoops, for some reason I was thinking each channel had its own volume. what operation does the vic use for mixing channels?