Search found 42 matches
- Thu Sep 24, 2020 5:03 pm
- Forum: Development
- Topic: What am I missing? - Calling RND from assembly.
- Replies: 15
- Views: 7100
Re: What am I missing? - Calling RND from assembly.
Don’t forget that the FRAMES counter only advances by one each video frame. For a 50Hz video system (Europe), that’s every 20ms. Also FRAMES only advances if the machine is generating video. Mark Excellent point! Depending on your use case, there may be any of a thousand methods to generate a pseud...
- Tue Sep 22, 2020 7:47 pm
- Forum: Development
- Topic: What am I missing? - Calling RND from assembly.
- Replies: 15
- Views: 7100
Re: What am I missing? - Calling RND from assembly.
In Basic you need to call RAND without an argument before calling RND. This uses the FRAMES counter as the random seed to generate a pseudo-random number. So, if you want to write your own assembly code, I would just use the FRAMES value, AND the result with 3, and test for 0. BEGIN: LD A,($4034) AN...
- Fri Sep 04, 2020 5:34 pm
- Forum: Development
- Topic: Splash Scree
- Replies: 10
- Views: 8572
Re: Splash Scree
Cool. An easy way to look at the source is to add these 3 lines: 50 FOR X=1 TO 9999 60 PRINT A$(X) 70 NEXT X Then you type GOTO 50 to show a screenfull of source code, and CONT to display the next etc. mrtinb, I am unfamiliar with MTASM and am curious about the graphics characters at the end of eac...
- Tue Sep 01, 2020 4:57 pm
- Forum: Emulators
- Topic: [Vb81] Test release.
- Replies: 32
- Views: 30349
Re: [Vb81] Test release.
It still seems faster than my ZX81.
- Mon Aug 10, 2020 10:40 pm
- Forum: Hardware
- Topic: This weekends projects
- Replies: 53
- Views: 23859
Re: This weekends projects
Here is another peripheral called the Parrot that is based on the same speech chip. There are some nice design references contained in this thread.
- Thu Aug 06, 2020 8:05 pm
- Forum: Welcome Area
- Topic: Howdy from Boston
- Replies: 3
- Views: 5260
- Tue Aug 04, 2020 3:37 pm
- Forum: WANTED
- Topic: Edge connectors / protoboards wanted. (UK.)
- Replies: 15
- Views: 13736
Re: Edge connectors / protoboards wanted. (UK.)
I did check on that site but listing is closed atm I have found someone on eBay whos got a few might be same person its same price :) It's because PokeMon closes his items when on vacation. Most of them will open again when he's back in a few days. And now it seems to be gone forever. Do you know o...
- Tue Aug 04, 2020 3:30 pm
- Forum: Emulators
- Topic: EightyOne emulator may have bug with WAV generating
- Replies: 14
- Views: 9988
Re: EightyOne emulator may have bug with WAV generating
I have also had problems with EightyOne wav files. Many on this site, including me, find the Java ZX81 Tape Converter to be one of the best tools available.
- Fri Jul 31, 2020 4:01 pm
- Forum: Development
- Topic: Pretty fast Mandelbrot set generator...
- Replies: 8
- Views: 7829
Re: Pretty fast Mandelbrot set generator...
Excellent!
Thanks, Bean.
Thanks, Bean.
- Thu Jul 30, 2020 4:50 pm
- Forum: Development
- Topic: Pretty fast Mandelbrot set generator...
- Replies: 8
- Views: 7829
Re: Pretty fast Mandelbrot set generator...
It would be nice if the zoom focused on the center of the screen. It seems like I need to move the screen down 2 clicks after every time I zoom.