Reply 120 of 122, by digger
Scali wrote on 2018-01-17, 12:15:
Also, I previously described a way to connect up to 256 ports to a single LPT. If you put two 8-bit latches on there, you can us […]wrote:
Also, the serial port competes with many other peripherals that could be useful for gaming whereas the LPT is basically redundant and always available.
Also, I previously described a way to connect up to 256 ports to a single LPT.
If you put two 8-bit latches on there, you can use one for address and one for data. A single line on the LPT selects between the two latches you write to.
You now effectively have an 8-bit address bus. With some address decoding logic, you can select between a number of chips/ports on the same device.
This should easily allow to combine an OPL3, CMS, Tandy and MPU401 on the same board.
With all these amazing projects going on, it might be time to revisit your idea. Perhaps in a separate topic/thread?