Lardo buys another zeddy

ZX80 / ZX81 hardware and software offered for sale or swapping
Moggy
Posts: 1911
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy » Wed Oct 09, 2019 4:30 pm

Looks very nice.
I'm guessing issue three, NEC ROM and CPU and back porch ULA. (That's if you open it up :twisted: )

Lardo Boffin
Posts: 1136
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin » Wed Oct 09, 2019 6:28 pm

Moggy wrote:
Wed Oct 09, 2019 4:30 pm
Looks very nice.
I'm guessing issue three, NEC ROM and CPU and back porch ULA. (That's if you open it up :twisted: )
I think I may just sell this one on untouched. Far too nice!

C7D1067D-37B1-4827-B5C8-338F56C8C41D.jpeg

Looking inside via the edge connector it is an issue one with the cream PCB on top, green below and everything is socketed. It doesn’t have a bugged ROM. For a change!

The output is dark but not ridiculously so.
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Spectrum +3

Lardo Boffin
Posts: 1136
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin » Wed Oct 23, 2019 4:14 pm

After a brief diversion buying a +3 with a soggy membrane back to form!

A working and would be immaculate zeddy (if it had been packed properly):

44BB170B-6D39-4789-BA8C-00DF3B5E8720.jpeg

The RAM pack does not work sadly.

Not sure what this interface is?

BD534746-0D0F-45B1-8981-C50BF1706451.jpeg
A6EE1659-7BEC-4249-A8E2-C25A2BF42634.jpeg

See the pins sticking out above the edge connector on the shot above? They were face down on the zeddy keyboard with nothing separating them. Argh!!!!
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Spectrum +3

Moggy
Posts: 1911
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy » Wed Oct 23, 2019 4:19 pm

That interface may be a 2716 EPROM/static memory board, it looks slightly similar to the two Hunter boards that I have.
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1024MAK
Posts: 2706
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Lardo buys another zeddy

Post by 1024MAK » Wed Oct 23, 2019 5:27 pm

The empty sockets are too small for most EPROM/ROM chips. It could however be some kind of RAM card, but using small SRAMs. I base this on them all being connected to the data bus.

The 74177 chips are counters, but may be being used as latches.

In any event, this looks like it was hand soldered and could be a home made / DIY or a magazine project.

Mark

Moggy
Posts: 1911
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy » Wed Oct 23, 2019 9:31 pm

I would say that's bang on the money,Mark.

Lardo Boffin
Posts: 1136
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin » Wed Nov 13, 2019 3:46 pm

Not bought one for a while. Was getting the shakes!!!

A nice working zeddy (green PCB, not opened yet) and 16K RAM which also still works!

Shame the manual was beyond mouldy and ended up in the bin. :cry:

B573924E-326C-4F1E-A7DE-9726037B8432.jpeg
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Spectrum +3

Lardo Boffin
Posts: 1136
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin » Wed Nov 13, 2019 4:56 pm

Its a very shiny green issue 3. 8-)

43D52BDB-F60A-46D5-BC97-B4CA21885B1A.jpeg
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Spectrum +3

User avatar
1024MAK
Posts: 2706
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Lardo buys another zeddy

Post by 1024MAK » Wed Nov 13, 2019 5:55 pm


Lardo Boffin
Posts: 1136
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin » Wed Nov 13, 2019 6:09 pm

1024MAK wrote:
Wed Nov 13, 2019 5:55 pm
Clicky :lol:

Mark
Oh yes. :D

Photos to follow next week of the other one I just bought a few mins ago. :roll: :roll:
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Spectrum +3

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