So, I've just received another ZX81 fro eBay. Opened it up and it's another one with the ROM fix chips on top.
I only have three ZX81s, two being with the ROM fix, so exactly HOW rare are these things?
Whopper
ZX81s with the ROM fix
ZX81s with the ROM fix
You woke me for THAT!!!
- 1024MAK
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Re: ZX81s with the ROM fix
Apparently in your house, not rare at all...
Different story here, I have at least ten ZX81s with normal ROM chips... plus I think one with the extra circuit to fix the ROM.
Of those without the fix, one is not working due to a faulty ULA. This may have the bugged ROM. I think most of the rest have the 'fixed' ROM.
Mark
Different story here, I have at least ten ZX81s with normal ROM chips... plus I think one with the extra circuit to fix the ROM.
Of those without the fix, one is not working due to a faulty ULA. This may have the bugged ROM. I think most of the rest have the 'fixed' ROM.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
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- Joined: Sat Nov 26, 2016 2:42 am
Re: ZX81s with the ROM fix
I have bought three kludge fix zeddies (i.e. with the extra circuit on top) off eBay so far. But then that is probably out of 15 to 20 zeddies.
I think I passed two of these on to members on here.
They tend to have the deeper sponge feet rather than the shallower harder rubber feet and in my case two of them came with ZX80 PSUs.
I think I passed two of these on to members on here.
They tend to have the deeper sponge feet rather than the shallower harder rubber feet and in my case two of them came with ZX80 PSUs.
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
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