1 Feb
2012
1 Feb
'12
5:01 p.m.
On 1 Feb 2012 at 18:21, Jim Brain wrote:
Barring implementation of 65SPI on a CPLD, is there a
quick-n-dirty
way to wire up a SPI-based module to an Apple II/II+/IIe? I'm looking
for a temp solution, while I design a Apple II board with a correct
interface. Something that doesn't require any soldering would be
grand (bit banging the SPI via some IO pins, Using the DSR/DTR/RTS
pins on the RS232 (if that can be done...), etc.
If you're not in the mood to program an MCU, Altera has an old
appnote for using a CPLD as an SPI "bridge":
http://www.altera.com/literature/an/an485.pdf
--Chuck