MOTM

The easiest way to do the hard drive wavetable storage would be to get a ROM
emulator, and just download the wavetable you wanted to that from some old PC.



>----- Original Message -----
>From: <ixqy@...>
>Hi Larry and list,
>I was thinking about something like this earlier today (well, yesterday
>now). It'd be nice to have an "aid" module with the space for lots and lots
>of ROMs, all immediately accessible via a couple of switches. I have two
>Miniwaves, so maybe an aid module could even select individual ROMs and
>route them to different Miniwaves?
>
>--LH--
>Well, switching a from one ROM to another in the same Miniwave module is an
>easy affair as I see it.  However, switching one ROM between 2 Miniwave
>modules is a whole different ball game.
>
>Unless I am missing something, all the ROMs are wired in parallel except for
>one pin.  Switching pin 20 from ground to 5 volts appears to enable or
>disable the ROM.  Now, I admit to knowing nothing about the PROM.  But, it
>seems it would be simple enough to have a single pole, 10 position, digital
>(not BCD) thumbwheel selector switch with 10 positions numbered 0-9 to
>replace the A / B switch on the front panel (I've been checking out some).
>
>A separate PCB could be constructed to with sockets for 9 chips.  It would
>have a ribbon cable of some nature that would plug into the socket in the B
>position of the Blacet Miniwave (except leave out pin 20).  No need to
>modify the Miniwave.
>
>It looks to me  like grounding pin 20 enables the ROM and putting 5 volts on
>it disables it.  So, the common connection point on the 10 position switch
>would connect to ground at point 3 on the PCB replacing S1.  The 0 position
>would connect to SW1 point 2 to select the on board ROM, and positions 1
>through 9 would go to the new PCB to select those sockets.  Looks like  we
>could pick up 5 volts at the now unused R27 position and have 9 100K
>resistors on the new PCB (one for each pin 22 just as John has the "B" chip
>wired now).  But, I could have that backwards.
>
>I might be making it too simple.  But, I don't think so.  What about it
>John?  See any problems?  Is my thinking screwed up?
>
>Yes, you could have a separate module with a rotary switch or something.
>But, I was thinking of something that could use
>the existing panel and basically replace the BANK A/B box.  But, cutting the
>square hole would sure be a bitch.
>
>Larry (also thinking out loud)
_______________________________________________________________________
Ken Stone   sasami@...  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>