ZX81CCP

ZX80 / ZX81 hardware and software offered for sale or swapping
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Lardo Boffin
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Re: ZX81CCP

Post by Lardo Boffin »

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? :lol:
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Moggy
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Re: ZX81CCP

Post by Moggy »

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? :lol:
I bet you'll end up collecting the bloody lot!! :lol:
Lardo Boffin
Posts: 2160
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Re: ZX81CCP

Post by Lardo Boffin »

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? :lol:
I bet you'll end up collecting the bloody lot!! :lol:
Who? Me? :)
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
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blittled
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Location: Northwestern Pennsylvania, USA

Re: ZX81CCP

Post by blittled »

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 :)
2X Timex Sinclair 1000, ZX81, ZX80Core, 5X 16K Ram Pack, ZXBlast, ZX P file to Ear Input Signal Converter, Elf II
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msansom
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Re: ZX81CCP

Post by msansom »

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.
I'd like to say thank you on behalf of the group and ourselves and I hope we've passed the audition.
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PokeMon
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Re: ZX81CCP

Post by PokeMon »

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.
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siggi
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Re: ZX81CCP

Post by siggi »

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
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
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gammaray
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Re: ZX81CCP

Post by gammaray »

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! :twisted:
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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blittled
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Location: Northwestern Pennsylvania, USA

Re: ZX81CCP

Post by blittled »

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.
2X Timex Sinclair 1000, ZX81, ZX80Core, 5X 16K Ram Pack, ZXBlast, ZX P file to Ear Input Signal Converter, Elf II
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gammaray
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Re: ZX81CCP

Post by gammaray »

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
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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