Electronics > Projects, Designs, and Technical Stuff

Home Brew Analog Computer System

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GK:
Thanks  :D

Here is the schematic for the R.O.M. board.

baljemmett:

--- Quote from: GK on April 29, 2014, 01:50:03 pm ---Things have been a little hectic for me lately, but this evening I finally managed to get the (almost complete) Fourier synthesis character generator/display unit up and running.

--- End quote ---

That's some lovely work, GK - thanks for sharing!

robrenz:

--- Quote from: baljemmett on April 29, 2014, 02:48:22 pm ---
--- Quote from: GK on April 29, 2014, 01:50:03 pm ---Things have been a little hectic for me lately, but this evening I finally managed to get the (almost complete) Fourier synthesis character generator/display unit up and running.

--- End quote ---

That's some lovely work, GK - thanks for sharing!

--- End quote ---

+1 :-+

GK:
Well, getting a little more serious now, this evening I removed the programming toggle switches, plugged a PIC16F874 into a bread board and wired it to the units programming port. A few quick test routines written for the '874 acting as the "remote" programmer and here is the result:



OK, I'm using a uC to program the display, but the character generator itself is 100% analogue and discrete digital logic (74HC' & 74HCT plus the SRAM).
Programming is completely asynchronous. You just put the data onto the 12-bit port and strobe the write pin. My simple discrete logic programming interface works flawlessly, transferring the asynchronously-received and latched data to the operating screen RAM during the blanking intervals without a glitch. Yahoo.

 

mamalala:
Fantastic stuff! A big thumbs up!

Greetings,

Chris

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