Super ZX80

Any discussions related to the creation of new hardware or software for the ZX80 or ZX81
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nollkolltroll
Posts: 247
Joined: Sat Sep 27, 2014 8:02 pm
Location: Stockholm, Sweden

Super ZX80

Post by nollkolltroll » Wed Feb 07, 2018 9:03 pm

I just did the first test on using an 8MHz crystal on my Minstrel ZX80 clone. Inspired by https://hackaday.io/project/28963/galle ... b09145c1a8
With 3 bytes changed in the ROM, it worked just as I wanted. Giving 32 characters, but compressed to the left with room for 12 more characters. Next up will be to mod the ROM even further so that BASIC uses all the extra screen real estate.
Of course, the ZX80 is now 23% faster :D
/Adam

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gammaray
Posts: 534
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: Super ZX80

Post by gammaray » Thu Feb 08, 2018 12:10 am

I am impressed again!
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

nollkolltroll
Posts: 247
Joined: Sat Sep 27, 2014 8:02 pm
Location: Stockholm, Sweden

Re: Super ZX80

Post by nollkolltroll » Thu Feb 08, 2018 7:15 pm

Did some updating of the ROM, found something to fix in SCROLL-routine. Seems to work properly now.
ZX80 44 characters.jpg
ZX80 44 characters.jpg (34 KiB) Viewed 606 times
/Adam

Shaun_B
Posts: 440
Joined: Wed Apr 22, 2009 10:22 am

Re: Super ZX80

Post by Shaun_B » Thu Feb 08, 2018 8:23 pm

Cool - I might buy another Minstrel clone to experiment. Super ZX80 sounds good to me :-)

Regards,

Shaun.

nollkolltroll
Posts: 247
Joined: Sat Sep 27, 2014 8:02 pm
Location: Stockholm, Sweden

Re: Super ZX80

Post by nollkolltroll » Fri Feb 09, 2018 8:38 am

Shaun, not trying to dissuade you from getting more stuff, but if you already have a Minstrel the only thing you need is a way to swap crystals (I use machined socket pins) and an (E)EPROM. Not a very risky mod to undertake, and VERY fast to return to original.
/Adam

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