|
FIRST THINGS FIRST: I HAVE NOT DIED! I PROMISE. ========== NOW...
Okay, what else... well there is this goofy looking thing.....
So, what the heck is it? Ah... it's just a small board that houses 28.375MHz, 28.63636MHz, 32MHz and 40MHz crystals, either SMT or thru-hole and allows me to select one of the four. This way I can test if my projects work with the timing of a PAL unit (28.375), NTSC unit (28.63636) or one of the two crystal 'hacks' for the ole' CoCo 3 - now I wouldn't recommend such an inductive capacitive nightmare for everyday use in a CoCo 3, but it comes in handy for doing tests... of course a few spares will eventually find their way for sale should anyone want one - the final product is silkscreened and soldermasked. And then we have this thing:
\
which is just a 16v8plcc to DIP converter board - I know - you can buy these things - but they all seen to have those big square pins - I needed one with pins that would plug into an IC socket for my MPI upgrade chips (I have many hundreds of the plcc package while my supply of DIP is dwindling...) Besides - it's much more fun to build stuff than buy it. Hmnnn... what else? Anything cool? OH YEAH - a 512K SIMM Upgrade that can use ANY 30-pin SIMM, not just the 8/9 chip kind. Yep, finally got this sucker to work! Okay - it actually gives access to all of the multiplexed address lines of the SIMM, so it could be used as a 1-meg, 2-meg, 4-meg or 8-Meg upgrade by simply building up a DAT board. I shall, perhaps, make that DAT board soon... but for now, here is the upgrade board:
The final boards (in fact all of those shown above) are silkscreened and soldermasked... Of course, I wanted to be able to add a DAT board rather easily, so I made this 40-pin socket adapter that plugs into the CPU socket, the cpu plugs into the adapter and all of the CPU pins are taken out to a 40 pin header as follows:
Other things that I've got working but not made PCB's yet are: 5 port serial pack supporting ALL signals on the DB9 connector including RI. Uses current production 14Mhz 6551's from WDC for three of the ports which are mapped as DISTO, Deluxe RS232 and Modem Pak - the other two are a z8530 - my agreement with WDC doesn't allow me to distribute these 6551 chips outside of a functioning product because they are technically engineering samples..., replacement FDC that is fully tandy compatible and supports high density plus emulation of a floppy drive via an sd card (based on the HxC floppy emulator supporting copy protected DMK images - may not be able to distribute this though cuz I don't have rights for the HxC...), 8-slot multi-pak and a few other GOODIES! Stay Tuned... Steve, I'll get those disks to you soon.
|