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Do you have your Vortex schematic posted anywhere Kim, I might wanna take a peek myself, but without a map I...er...? might not !! MArk Red Kim Flint wrote: > At 12:39 AM -0800 11/17/99, b.knox wrote: > > >"Audio memory consists of 64K x 4 DRAMs, which provide a total of 2 > >seconds of > >delay. The unit may optionally be configured with 256K x 4 DRAMs, with > >the > >addition of U10." > > > >an 8 second vortex? eeep um that would be er, nice. > > > >no other mention is made of this "memory upgrade" except in the actual > >schematics... > >the U10's look like they make up an extra bit of the DRAM controller .. > >part number 74HC125 (what are the little triangles again? capacitors?) > >... it > >looks as though the routing to the DRAM chips must be completely changed > >to get > >the 256K's in there... i'm not too sure... U10 is included in the > >schematics as "spare".. don't know if they're actually inside the box > >... getting ye olde 256K DRAM should prove entertaining enough anyway... > > > >i've emailed both lexicon and Bob Sellon (of jamman upgrade fame) about > >this but with no response ... anyone heard of such an upgrade? > > > >i'd really like to know if 8 sec / dual 4 sec vortex bliss is possible > >in this universe ... > > I looked at my vortex schematic. If you want to try this, looks like you > need to pull out the existing dram chips, U15, U18, U20, U21. Add in >256kx4 > drams chips at U16, U17, U19, U22. (They have part# 44256 on the >schematic, > that may correspond to an actual part. You can probably find them surplus > somewhere.) The you add in tristateable buffer chip 74HC125 at U10, which > brings out an additional address line to the dram. > > Whether software will recognize the additional memory is a whole other > matter. Looks like fun though, someone should try it and let us know how >it > comes out. > > kim > > ______________________________________________________________________ > Kim Flint | Looper's Delight > kflint@annihilist.com | http://www.annihilist.com/loop/loop.html > http://www.annihilist.com/ | -- "In vodka Veritas"