CoCo Xpndr1 Revisited...

Otay... I haz pix... Here's what a CoCo Xpndr1 looks like: (warning, pictures might be kinda big ~~ 100k-ish) http://www.30below.com/~zmerch/xpndr1/xpndr1-top.jpg http://www.30below.com/~zmerch/xpndr1/xpndr1-bottom.jpg The scans aren't the greatest as I had no black paper at the time to reduce the translucency of the board... but it'll give y'all a much better idea as to what it is... Now, the first thing I'm going to do is put on a 74LS245 bus transceiver on the data lines, and a pair of 74LS244's to buffer the address lines... right? Could I also use a LS244 to buffer E & Q? I wouldn't think that shottky parts would impart much noise on a 1Mhz signal... I also plan on adding: A jumper/switch to enable the CART signal easily, A row of jumpers to easily enable multiple address decoding (along with the associated NOR's, NAND's & a well-placed 74LS138...) and methinks that'll fill out "round 1" of the Merchalizer expansion board. (No, I'm not really going to call it that. ;-) Later on, I'd like to make an expanded version with 1 or 2 integrated 16550's and a couple A/D's already addressed in... The board is *already* a lot different than what you see in the pictures, with the addition of both a "hard-drive" PC power connector & a floppy-type PC power connector, with a power LED for the external power supply & it's jumper selectable whether or not you wish to use the CoCo's available power AutoCad file hits my website, there will be no resemblance whatsoever, and all the card will be is what it was to begin with: inspiration to make an experimenter card "far beyond" (and IMHO much more useful) anything else I'd seen floating around... And -- the practice playing with chips that I get far too little time to do! Anyway, dat's da stuff! Roger "Merch" Merchberger -- Roger "Merch" Merchberger --- sysadmin, Iceberg Computers Recycling is good, right??? Ok, so I'll recycle an old .sig. If at first you don't succeed, nuclear warhead disarmament should *not* be your first career choice.