While clearing the attic, I found this PCB:


Looks like a slot expander which was not finished at all.
Does someone recognize it? Can someone tell me more about it?
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While clearing the attic, I found this PCB:


Looks like a slot expander which was not finished at all.
Does someone recognize it? Can someone tell me more about it?
Looks like sunrise 8 slots expanderen
Not a slot expander, but an 8-way slot selector card. That is: plug in cartridges, and select which of those you want active (just one at a time I think).
From Dutch Elektuur magazine - white marking below the slots has pcb id #.
Found a .pdf describing it on Hans Otten's page here (scroll down to "Elektuur mei 1986 - MSX Uitbreidingen deel 3").
Thanks, RetroTechie!
So, what shall I do with the PCB?
complete it
I don't think that Manuel is an soldering iron maniac !
Perhaps will be when he has finished this
Then he can go further with a GR8BIT
Is there a BOM somewhere?
Somewhat on-topic: I'm trying to learn how the PPI / MSX memory works. An 8 slot expander would be impossible as the MSX can only set slot 0-3 in its internal 4 addressing pages, right? So it would have to be a device that selects one of its own slots and just tells the MSX it's always slot 1 or 2 or something, like RetroTechie described I think.
I did try to read the document on Hans Otten's website, by the way, but that was all Chinese to me. (I don't speak Chinese, obviously)
@SuchAGoonie The 4-subslot limit only applies to memory access. For I/O access there is no restriction to the number of expansions. Sunrise sold an 8-slot expander where the first four slots were regular expanded slots, and the latter four were only usable for I/O-only devices such as Music Module, MoonSound, Gfx9000, etc.
(But, that’s not this module obviously as RetroTechie explained.)
Ah, I understand. So for memory addressing, you can select slots using the PPI ports (#A8 - #AB) and then just address it normally, and when you want to talk to something other than memory, for example the MoonSound you mentioned, you use the ports that the MoonSound uses.
The MoonSound wasn't part of the official MSX standard, right? Does 3rd party hardware simply select some port numbers that aren't normally used by an MSX and provides its interface via those ports?
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