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Re: Lardo buys another zeddy
Posted: Wed Oct 09, 2019 4:30 pm
by Moggy
Looks very nice.
I'm guessing issue three, NEC ROM and CPU and back porch ULA. (That's if you open it up
)
Re: Lardo buys another zeddy
Posted: Wed Oct 09, 2019 6:28 pm
by Lardo Boffin
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
)
I think I may just sell this one on untouched. Far too nice!
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.
Re: Lardo buys another zeddy
Posted: Wed Oct 23, 2019 4:14 pm
by Lardo Boffin
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):
The RAM pack does not work sadly.
Not sure what this interface is?
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!!!!
Re: Lardo buys another zeddy
Posted: Wed Oct 23, 2019 4:19 pm
by Moggy
That interface may be a 2716 EPROM/static memory board, it looks slightly similar to the two Hunter boards that I have.
Re: Lardo buys another zeddy
Posted: Wed Oct 23, 2019 5:27 pm
by 1024MAK
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
Re: Lardo buys another zeddy
Posted: Wed Oct 23, 2019 9:31 pm
by Moggy
I would say that's bang on the money,Mark.
Re: Lardo buys another zeddy
Posted: Wed Nov 13, 2019 3:46 pm
by Lardo Boffin
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.
Re: Lardo buys another zeddy
Posted: Wed Nov 13, 2019 4:56 pm
by Lardo Boffin
Its a very shiny green issue 3.
Re: Lardo buys another zeddy
Posted: Wed Nov 13, 2019 5:55 pm
by 1024MAK
Re: Lardo buys another zeddy
Posted: Wed Nov 13, 2019 6:09 pm
by Lardo Boffin
Oh yes.
Photos to follow next week of the other one I just bought a few mins ago.
