does anyone have these files ??

[jojo]

Hi forum ,

tried to download some files the last days , but apparently the website is not really maintained anymore .

i am looking for the files to make a zxmux replacement to replace a zx8401 .

files should be available from ; https://8bit.yarek.pl/upgrade/zx.zxmux/index.html

but i can not download them ( nor can i register ) .




anyone got them ??


jojo

[1024MAK]

I’ve had the same problem with that website four or five (or maybe more) years ago.

It requires you to register, but when you try, you don’t get anywhere

Hence I don’t have those files. The ZX8401 does exactly the same job as the 74LS series chips that are fitted to issue 2 to issue 4S for the upper RAM. So it is possible to derive a schematic from comparing an issue 4 schematic with an issue 6A schematic.

You would however have to design your own PCB...

Mark

[jojo]

@1024mak , yep that is what it is about ( trying to fix a 128+ without keyboard action )


anyone maybe got the pcb made in china and got one left over ??

[Ralf]

Yes, this website isn't maintained for years.
You may ask at www.speccy.pl about these files. It's a Polishe site but write in English and
these guys should help you.

[Luzie]

The .PNG can be opened here by me:

[zx64]

I can open PNG file as well

[jojo]

If anyone is interested ;

http://ge.tt/8JFEuk63


jojo

[jojo]

pcb should look like this

[1024MAK]

For the record, the ZX8401 is the upper RAM multiplexor. It is also known under the PCF1306P name and the Amstrad part number 40058. It was introduced in the issue 5 board 48K Spectrum, and also used on the 6A board Spectrum, the 128K Toastrack, and the +2 (grey).

See also this topic.

Mark