Multiplexer chip

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mselkin
Bent Pin Expansion Port
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Multiplexer chip

Post 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
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Chr$
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Re: Multiplexer chip

Post 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.


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Dave
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Re: Multiplexer chip

Post by Dave »

That will definitely not work in a QL.


mselkin
Bent Pin Expansion Port
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Re: Multiplexer chip

Post by mselkin »

Oh, ok, thanks!
eBay listing has it as compatible with QL?
eBay item number:164532401824


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tofro
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Re: Multiplexer chip

Post 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)


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mselkin
Bent Pin Expansion Port
Posts: 85
Joined: Mon Mar 01, 2021 11:49 am

Re: Multiplexer chip

Post by mselkin »

Thanks guys!
You saved me from a very poor repair attempt . :)


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