diradin@phoenix.Princeton.EDU (Dean I Radin) (10/22/88)
I want to test a special IC chip that uses a total of 11 I/O
lines (8 for data I/O, 3 for address lines). I could design
a serial-to-parallel translator with a UART, and go through the
serial port, but for the quick and dirty test I want to do I'd rather
use the Amiga's parallel port.
Problem: The parallel port only provides 8 parallel I/O lines.
Question: Does the Amiga provide three other output lines controllable
by software? Perhaps some of the game or mouse port pins?
Dean Radin
Dept. of Psychology
Princeton University
diradin@phoenix.princeton.edujms@antares.UUCP (joe smith) (10/24/88)
In article <4070@phoenix.Princeton.EDU> diradin@phoenix.Princeton.EDU (Dean I Radin) writes: >Question: Does the Amiga provide three other output lines controllable > by software? Perhaps some of the game or mouse port pins? Locate a copy of the Amiga Hardware Reference Manual and check out the chapter on "Interface Hardware". Table 8-5 shows the bits used in the POTGO register. It says: "Instead of using the pot pins as variable-resistive inputs, you can use these pins as a four-bit input/output port. This provides you with the equivalent of two additional pins on each of the two controller ports for general purpose I/O". I sent a letter to Steve Ciarcia with this information after he stated (wrongly) that the pins on that A500 joystick connector could not be used for output. Note that getting 2 bits is easy - use the joystick connector. With a break-out cable, it is possible to get the 3rd bit and still have use of the two-button mouse. -- +----------------------------------------------------------------------------+ | TYMNET:JMS@F29 CA:"POPJ P," UUCP:{ames|pyramid}oliveb!tymix!antares!jms | | INTERNET: (Office-1.ARPA is no more) PHONE:Joe Smith @ (408)922-6220 | +----------------------------------------------------------------------------+