* WDC 65c816 CPU (seems to run fine at 20MHz, 25MHz seems to be too much) * WDC 65c22 “Versatile Interface Adapter” (aka VIA, for some IO and timers) * FTDI FT240X, 8-bit USB UART, for a simple Serial Interface over USB * 2x IS61C5128AL for 1MB of SRAM * SST39SF040 for 512kB of ROM (only ~16kB used) * 74′ Logic for Clock signal generation (74AC74) and Data/Address Demux-ing (74AHCT245) * 2x DS1813 with one used for the reset Button and the other to debounce the “NMI” Button * LM340T with a crappy Heat Sink to lower the DC jack input voltage to 5V * ATF1508 CPLD for the glue logic that holds everything together
IO stuff:
* USB for Serial * DC Barrel Jack for Power (center positive) * Combined PS/2 Port for both Keyboard and Mouse (requires Y Splitter to use both at once) * 8-bit IO Port below the PS/2 Connector for whatever i can think of * Expansion Connector in the center of the board for future features
also yep, there is already a botch wire between U6 and U7 because U6 was tilted after i soldered it on so pin 1 wasn’t making contact with the pad so i had to connect it to U7.
Beautiful work!
What’s the name of the package of those square chips and their brown sockets?
Also why did you leave out that decoupling capacitor on the far left?
about the specs!
* WDC 65c816 CPU (seems to run fine at 20MHz, 25MHz seems to be too much)
* WDC 65c22 “Versatile Interface Adapter” (aka VIA, for some IO and timers)
* FTDI FT240X, 8-bit USB UART, for a simple Serial Interface over USB
* 2x IS61C5128AL for 1MB of SRAM
* SST39SF040 for 512kB of ROM (only ~16kB used)
* 74′ Logic for Clock signal generation (74AC74) and Data/Address Demux-ing (74AHCT245)
* 2x DS1813 with one used for the reset Button and the other to debounce the “NMI” Button
* LM340T with a crappy Heat Sink to lower the DC jack input voltage to 5V
* ATF1508 CPLD for the glue logic that holds everything together
IO stuff:
* USB for Serial
* DC Barrel Jack for Power (center positive)
* Combined PS/2 Port for both Keyboard and Mouse (requires Y Splitter to use both at once)
* 8-bit IO Port below the PS/2 Connector for whatever i can think of
* Expansion Connector in the center of the board for future features
also yep, there is already a botch wire between U6 and U7 because U6 was tilted after i soldered it on so pin 1 wasn’t making contact with the pad so i had to connect it to U7.
if you want the full history of how this was designed, here the 6502 forum thread: http://forum.6502.org/viewtopic.php?f=4&t=7213