Sinclair ZX80 / ZX81 / Z88 Forums

The original ULA can be fed with a 6.5Mhz, that's how the original "clock doubling" worked as for replacement ula's YMMV. And yes i believe it would be a much simpler idea... i don't think you even need to change the rom just have a sync loop before the main player that prompts the user to "press th...

I think its possible to build an external device that can plug into the edge connector of 2 zeddies and keep them in sync. prior to the data been sent to the DAC there is a LD A,(HL) // same for playBuf_A or playBuf_B ... now with mininal changes to the player code.. I.e remove some of the NOPS ( re...

@Moggy, Your gonna have a heck of a time trying to get 2 independent zeddies to be anywhere near close at 22K however you could record output on pc in stereo and time shift the channel to match to get a more accurate idea of what it would sound like... @NOLLKOLLTROLL / Adam any chance of the source ...

Moggy / Adam.... Anyway to sycn up 2 zeddies ? one for each channel ? perhaps an external master ticker providing a constant 22.109 Khz clock.. so zeddies do what they are doing ( i haven't looked at the code to see how constrained it is ) but wait just before output data to the DAC for the EXTernal...

won me a themaltake G1 keyboad off ebay with Cherry mx Blues, nice and clickey

Cheaper than buyinga bunch of keyswitches.

One step closer,

Regards Andy

thanks for the ebay link, i'll probably go with these as its going to be a lot cheaper, and if printed on some nice paper should look pretty good.

Andy

I would like a PCB. Where / How did you get the key caps printed they look awesome.

Regards Andy

great stuff, excellent work.

Andy

Yeah late to the party but... This project seemed good enough to dig the old zeddy out and whip up a ladder DAC... anyhow Moggy showed me how to convert music files into the format needed for the player and i'm sitting here listening to ghostbusters on repeat :D i have enough zeddies that i can dedi...

Hi