Search found 222 matches
- Wed Feb 14, 2024 4:16 pm
- Forum: Programming
- Topic: Playing better notes
- Replies: 1
- Views: 1491
Playing better notes
I read, somewhere, of a program that toggles between two values in a sound register to produce frequencies closer to real notes - do any of you know what I'm talking about and where I could get it from?
- Tue Feb 13, 2024 5:49 pm
- Forum: Hardware and Tech
- Topic: Powering a C64 (or VIC-20) with a USB Power Bank
- Replies: 8
- Views: 5171
Re: Powering a C64 (or VIC-20) with a USB Power Bank
Something's not firing on all cylinders - Denial has just emailed me to notify me that Mike made that post!
- Sat Feb 03, 2024 8:35 pm
- Forum: Hardware and Tech
- Topic: Victor 6560 Replacement - Added graphics ops, just for fun
- Replies: 5
- Views: 2012
Re: Victor 6560 Replacement - Added graphics ops, just for fun
...you might want to take a sharp look at my ellipse routine (snippet taken from one of my example programs for MINIGRAFIK): If you're following in my footsteps, you might need to know that the range of some of those variables is somewhat larger than you'd imagine: For a resolution of 172x184, e(-5...
- Wed Jan 24, 2024 10:10 pm
- Forum: Hardware and Tech
- Topic: Victor 6560 Replacement - Added graphics ops, just for fun
- Replies: 5
- Views: 2012
Re: Victor 6560 Replacement - Added graphics ops, just for fun
I'm assuming (MX,MY) is the center point and that A and B are the major and minor radii? What you have here looks very similar to the code I have in Victor, give or take the ellipsy bits. I'll stare at this for a while and see if I can get it going. Thanks! Rounded rectangles would be neat, but that...
- Tue Jan 23, 2024 6:30 pm
- Forum: Hardware and Tech
- Topic: Victor 6560 Replacement - Added graphics ops, just for fun
- Replies: 5
- Views: 2012
Victor 6560 Replacement - Added graphics ops, just for fun
I've not been working on Victor, the 6560/61 replacement FPGA, for a little while due to health issues. To break myself back into working on it I implemented some graphics primitives, just for fun. Drawing points, lines, boxes, rectangles, circles and filled circles: https://www.youtube.com/watch?v=...
- Sun Jan 07, 2024 8:29 pm
- Forum: Programming
- Topic: Pixel, pixel, on the wall - who's the squarest of them all?
- Replies: 3
- Views: 3708
- Sun Jan 07, 2024 10:40 am
- Forum: Hardware and Tech
- Topic: Vic 20 Rev D, low voltage across the board, black screen
- Replies: 16
- Views: 7975
Re: Vic 20 Rev D, low voltage across the board, black screen
It's worth noting that 74LS series chips aren't as plentiful as they used to be, and unscrupulous dealers will sell you re-marked 74HC chips (or is it HCT?), claiming them to be LS. They'll often work for the job in hand, but you need the real thing occasionally, especially in crystal oscillator clo...
- Sun Jan 07, 2024 10:15 am
- Forum: Programming
- Topic: Pixel, pixel, on the wall - who's the squarest of them all?
- Replies: 3
- Views: 3708
Pixel, pixel, on the wall - who's the squarest of them all?
Wotcha!
When you are writing games or other graphics routines for your VIC-20 you'll sometimes need to compensate for the pixels being rectangular rather than square. My question is:
What aspect ratio do you assume for pixels in your code?
When you are writing games or other graphics routines for your VIC-20 you'll sometimes need to compensate for the pixels being rectangular rather than square. My question is:
What aspect ratio do you assume for pixels in your code?
- Tue Jan 02, 2024 6:25 pm
- Forum: Hardware and Tech
- Topic: S-Video conversion possible as plug-and-play solution?
- Replies: 87
- Views: 85560
Re: S-Video conversion possible as plug-and-play solution?
OTOH, the original video circuitry could be considered broken by design: a proper S-Video mod cures that fault and warrants solder work on the mainboard anyhow. :) There's a whole bunch (6? 8?) of different circuits used in different VIC-20s for video, so a one-size-fits-all S-Video mod is never go...
- Thu Dec 21, 2023 10:34 pm
- Forum: Hardware and Tech
- Topic: Powering a C64 (or VIC-20) with a USB Power Bank
- Replies: 8
- Views: 5171
Re: Powering a C64 (or VIC-20) with a USB Power Bank
There's also a potential problem if you start plugging in cartridges - I'd guess that some might pull the 5V line down a bit, which might cause stability issues. I can't imagine this is going to work well with a VIC-20 that has the two-prong AC power connector and the built-in voltage regulator/room...
- Tue Nov 21, 2023 1:53 pm
- Forum: Hardware and Tech
- Topic: PCB manufacture
- Replies: 2
- Views: 3648
Re: PCB manufacture
There's also PCBWay.
I've done around a dozen PCBs with JLCPCB without any problems (other than my own design faults).
When checking prices, remember to factor in postage.
I've done around a dozen PCBs with JLCPCB without any problems (other than my own design faults).
When checking prices, remember to factor in postage.
- Mon Oct 09, 2023 12:45 pm
- Forum: Hardware and Tech
- Topic: ClearVideo - My take on the install
- Replies: 2
- Views: 3415
Re: ClearVideo - My take on the install
How are you isolating the VIC chip from the original video circuitry? How are you connecting the ClearVideo to the VIC chip?
- Mon Oct 09, 2023 12:40 pm
- Forum: Hardware and Tech
- Topic: Making a cheap Power supply.
- Replies: 5
- Views: 3538
- Wed Sep 20, 2023 5:39 pm
- Forum: Hardware and Tech
- Topic: VIC 5 Pin DIN
- Replies: 1
- Views: 2998
Re: VIC 5 Pin DIN
I don't, but I do have some advice: that connector sees lots of plugging and unplugging action, so be generous when you solder it to the board to give it as much mechanical help as possible!
- Wed Sep 20, 2023 5:33 pm
- Forum: Hardware and Tech
- Topic: I/O0 and illegal opcodes
- Replies: 9
- Views: 4038
Re: I/O0 and illegal opcodes
* Is there any expansion card, or cartridges that use for any purpose the address space $9130-93FF ?. I know that in the doc its says 'future expansion' but is there " anyone " using it ? Victor, my FPGA replacement for the 6560/1, uses many of the addresses in that range (the ones that d...