Sinclair ZX80 / ZX81 / Z88 Forums

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...

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...

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...

It still seems faster than my ZX81.

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.

Welcome!

There are several libraries available. One of me favorites is here.

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...

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.

Excellent!
Thanks, Bean.

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.