Sinclair ZX80 / ZX81 / Z88 Forums

Now that you have a green one have you considered doing a red one as well? Green for issue one zeddys and red for issue three?

Lardo Boffin wrote: ↑Sun Apr 02, 2017 8:42 am Now that you have a green one have you considered doing a red one as well? Green for issue one zeddys and red for issue three?

I bet you'll end up collecting the bloody lot!!

Moggy wrote: ↑Sun Apr 02, 2017 5:22 pm

Lardo Boffin wrote: ↑Sun Apr 02, 2017 8:42 am Now that you have a green one have you considered doing a red one as well? Green for issue one zeddys and red for issue three?

I bet you'll end up collecting the bloody lot!!

Who? Me?

I'm thinking or wiring a mini spst toggle switch to J7 and mounting it to the side of the case so I can easily reverse the screen

blittled wrote: ↑Tue Apr 04, 2017 3:21 am I'm thinking or wiring a mini spst toggle switch to J7 and mounting it to the side of the case so I can easily reverse the screen

What would really be cool would be to have a flip flop and address decode to put that under software control.

Andy's ZX ULA is able to do that and offers much more like clock doubling. Unfortunately is not available now. Anyway not fun to solder 10 or more wires instead of now only 3 (GND,5V,Video In) and board wouldn't be so tiny.

Here you can see what is necessary to have some additional flipflops for some switching activities (ram bank switching)

http://forum.tlienhard.com/phpBB3/viewt ... 561#p27216

green: 8 addressbus lines
yellow: 8 databus lines (OK: sufficient would be 1 for your single flipflop)
blue: control bus

Regards
Siggi

Wonderful improvement! Now, how about a frame buffer to hold the screen until display can be executed?

By Pokémon:

I made a study about that earlier already and have a solution in my mind but in the moment no chance to realize. Anyway would be larger in size and more expensive. I have another solution in my mind which may come in summer. Maybe.

Pure sorcery!

What size Phillip Screw driver is used on the pots. Is it a 0#, 00#, 1#,etc? I need to make an adjustment and all my small screwdrivers won't work well.

blittled wrote: ↑Sat Apr 15, 2017 2:59 am What size Phillip Screw driver is used on the pots. Is it a 0#, 00#, 1#,etc? I need to make an adjustment and all my small screwdrivers won't work well.

Try this...
http://sinclairzxworld.com/viewtopic.ph ... =30#p21770