For building my own version of an 68000 based computer (actually, it’s the 68008, i.e. 8bit version) I recently, ordered all parts that are described in the 68k blog, here is a list together with the prices that I paid at Digi-Key. The package to about 10 days from the US.
Here’s a video walk through, followed by the list and data sheets of the chips:
Here’s the list of glue chips, together with their function and respective datasheets as links:
SN74LS244N: OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SN74LS32N: quadruple OR gate
SN74LS08N: quadruple AND gate
SN74LS139: demultiplexer for deciding whether to access flash, RAM or serial.
SN74LS00N: NAND gates
More complex chips:
AS6C4008: 4MBIT RAM
SST39SF040: 4MBIT Flash ROM
ATF22V10C: GAL chip (programmable logic)
The USB host chip referred in the video is here, there is also shields for Arduino.
After posting this on Reddit, there was a great discussion on how to reduce the chip count. Some suggested that I could reduce the complexity by using the address lines in a clever way, i.e. using one pin to enable RAM access, one to enable flash access and one for the serial connector. I’d LOVE to try that out. Should I dare?