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Irem M92 Multi Game Dev Info

@stt1 same pinout, same logic BUT:
- selection signals are 3.3V
- reset is 5V, one easy way to handle it is driving it 3 state: not in reset = high impedance, reset = low (basically you never drive a high level signal)
 
Ape Cosplay said:
@stt1 same pinout, same logic BUT:
- selection signals are 3.3V
- reset is 5V, one easy way to handle it is driving it 3 state: not in reset = high impedance, reset = low (basically you never drive a high level signal)
Click to expand...

I guess it wont be 5V tolerant input for selection...

Maybe some ugly resistor hack or something... The current PCB does not support 3.3V selection signals.
 
2 diodes would drop the voltage to 3v6 which is within 10% of 3v3
 
Yeah, there are ways. But current PCB has no pads for more components (5V->3.3V). And I have a good pile of PCBs... And yeah, before someone says: getting set of PCBs is not too expensive, yes, it wont, but another set of PCBs + some more components etc. -> I have to raise the price a bit. And of course, for proofing the concept, I would need the multi myself (all current multis I have at the moment are +5V operable).

Need to think a bit. Maybe something like 20 pre-orders could be a solution or so.

Edit: Before going any further... I make an assumption that the multi is 3.3V board internally, but using common ground level from the main M92. Any reason why I could not pick the +5V and GND from main PCB, if multi has no +5V available? Just selection level needs to be dropped to 3.3V?
 
Last edited:
You'll get 3.3V from the header pins on the multi, but 5V is also available from alternative points (connectors, capacitors, etc.).
stt1 said:
Just selection level needs to be dropped to 3.3V?
Click to expand...
Yes but that's 4/5 signals (4 for selection + reset).
 
I am in for a preorder x2. Selectors are nice and honestly? This is an expensive hobby but I feel maybe Idk I am caught up now?
10+ years of a hobby on credit even @ 3-5% hurt.
I want me some selectors.
More than just m92...
 
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