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Multiplexer chip
Posted: Wed Jun 23, 2021 11:56 am
by mselkin
Hi everyone,
If replacing the multiplexer chip, with of these recreated ones, do I still need to perform the mandatory mod of the two resistors and wire to pin 1 of the adjacent chip?
Thanks,
Mark
Re: Multiplexer chip
Posted: Wed Jun 23, 2021 12:40 pm
by Chr$
That's a replacement for the ZX8401 isn't it (and other part names), for the late 48k issue 6 Spectrums and the early Spectrum 128k versions?
Pretty sure it won't work in a QL, despite some incorrect info online.
Re: Multiplexer chip
Posted: Wed Jun 23, 2021 1:33 pm
by Dave
That will definitely not work in a QL.
Re: Multiplexer chip
Posted: Wed Jun 23, 2021 2:51 pm
by mselkin
Oh, ok, thanks!
eBay listing has it as compatible with QL?
eBay item number:164532401824
Re: Multiplexer chip
Posted: Wed Jun 23, 2021 3:45 pm
by tofro
No, that will definitely not work in the QL. Seems to be a misunderstanding on the seller's side. The QL chip is ZX8301, the Spectrum ZX8401. (Small number difference, but a big one in function)
Re: Multiplexer chip
Posted: Wed Jun 23, 2021 3:54 pm
by mselkin
Thanks guys!
You saved me from a very poor repair attempt .
