Sinclair ZX80 / ZX81 / Z88 Forums

And I have created a simple ZX81 test program to do the outs: https://github.com/chernandezba/zesarux/blob/master/src/extras/media/zx81/tests/zesarux-zxi-ports.p Ciao Cesar, long time have passed but we are doing retrocomputing for a reason, aren't we? :) I was trying to use the feature (and took m...

roganjosh wrote: ↑Fri Jan 08, 2021 11:11 am http://files.righto.com/calculator/sinc ... lator.html

Red this post by chance but very very interesting link!
Nice story, nice engineering work and nice emulator (with on/off switch as a cherry)!
Thank you for sharing!

This is for sure one of the best looking clone around!

@zxhenk, a side question: how did you manage to get the custom labels on the MX keycaps?
I'm interested for custom keyboards I've made (e.g. Gherkin and BM43A)

Recently I started using sjasmplus with the Visual Studio Code + Z80 Assembly Meter extension and I'm really enjoying it, just select the code with the mouse and you have the count of bytes and T-states displayed in the status bar. Very practical! It is still manual calculation (and when you start ...

I now use 4.12 fixed point math so you can zoom in further. I've seen that you're doing a lot of operations just to manage the 4 bit displacement. Wouldn't it be faster to go 8.16 in case more exponent were needed? (seems to me you would need the same operations to manage the exponent and even havi...

dr beep wrote: ↑Thu May 30, 2019 8:44 pm Got my base...

Ciao Johan, might you share the sjasm adapted version of the kit?
(since Visual Code "source debugger" possibility it might be interesting to many)

For the people that develop their own flicker-free routine (e.g. for ZX80, but also custom ones for ZX81) or anyway programs that need very accurate fine grain timing, there is always the need to calculate the cpu cycles of the program pieces, and usually this activity is done by hand (as I did also...

Very impressive indeed!