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Re: how to verify if a multiface 1 is working ??
Posted: Sat Mar 23, 2024 8:19 pm
by 1024MAK
Two things:
The Opus has its own bank switched / paged ROM/RAM system, so there must be a switch or something to prevent clashes between them.
The MF1 looks to be missing a lot of logic chips.
Mark
Re: how to verify if a multiface 1 is working ??
Posted: Mon Mar 25, 2024 10:16 am
by jojo
i took all those chips off to verify them in a component tester
i will try to get some sense into the opus coming weekend ,
Need the formatting programm to do so on a pc-floppy .
Anyone ?
Re: how to verify if a multiface 1 is working ??
Posted: Thu Apr 04, 2024 2:11 pm
by jojo
the only result at pressing the nmi-button is speccy reset.
i verified the eprom , and it is ok ( verified against download )
Any ideas ?
- i have ordered the multiface remake pcb , so in an attempt to see if that one works on theis "frankenstein"build spectrum.
Re: how to verify if a multiface 1 is working ??
Posted: Thu Apr 04, 2024 5:26 pm
by 1024MAK
Ahh, I was going to reply the other day, must have forgotten
As the Opus also uses it's own ROM, has the previous owner fitted or modified the MF1 board with a switch or some other method to disable/prevent it's ROM and RAM from being paged in?
Mark
Re: how to verify if a multiface 1 is working ??
Posted: Fri Apr 05, 2024 8:31 am
by jojo
Hi mark ,
nothing specific on the front of the pcb ,
Or on the back ,
only multiface enable and the nmi switch have been extended to some wire-posts
all ic's get their 5 volt .
- i have ordered the parts to make a new multiface to try on the output connector of the opus , see if that will work ( need time to get that unit build ) .
Re: how to verify if a multiface 1 is working ??
Posted: Sun Apr 14, 2024 11:32 am
by jojo
now waiting for the last components to arrive , and then do some basic testing on a speccy , and if that works well i will put it on the extender connector of the discovery to see if it works there too .
- might be needed to remove the diode on the multiface one
Re: how to verify if a multiface 1 is working ??
Posted: Sun Apr 14, 2024 12:12 pm
by Paul
Have soldered the edge connector?
It seems to be on the wrong side of the PCB and the plastic end parts need to be taken off.
Re: how to verify if a multiface 1 is working ??
Posted: Sun Apr 14, 2024 6:17 pm
by jojo
Was only a mock-up , connector not soldered !!
Re: how to verify if a multiface 1 is working ??
Posted: Fri Apr 19, 2024 10:52 am
by jojo
okay ,
finally came to testing the new pcb , and ......
It is only partly working ;
i get the multiface-menu after pushing the nmi button .
BUT , it looks like i can not select any options ( aka there is no keyboard response )
What might be causing that ?? - tried on a stand alone speccy 48 -
= i noticed that WHEN i can give the multiface a command it only is possible when it looks the screen is being refreshed( looks like a slight blinking taskbar .....)