| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 291.1 | only 2 bits out per port | BAGELS::BRANNON | Dave Brannon | Wed Feb 04 1987 23:41 | 15 |
| yes, they are bidirectional. According the Hardware RKM, "the
pot-control register controls a four-bit bidirectional i/o port
that shares the same four pins as the four pot inputs. Instead
of using the pot pins a variable-resistive inputs, you can use
these pins as a four-bit input/output port." That pins 9 and 5
of each port.
It also says that there are large capacitors on these lines, and
it can take up to 300 microseconds for the line to change state.
I didn't find anything that said the joystick lines could be
used for output.
-dave
|
| 291.2 | | ECC::JAERVINEN | impersonal name | Thu Feb 05 1987 03:36 | 3 |
| Thanks.... one of these days, after recovering from the financial
shock caused by bying the machine itself (bought it last night)
I'll get all these manuals...
|
| 291.3 | | BAGELS::BRANNON | Dave Brannon | Thu Feb 05 1987 13:13 | 13 |
| Documentation is one of those hidden costs you find out about usually
after buying the computer. I bought the Rom Kernal manuals one
at time, each time thinking i didn't need the lower level ones.
Its a nice reference, but not absolutely essential for programming.
But curiousity about what was in the manuals i didn't buy really
got to me after about 2 months.
I'm currently working thru a book called Inside the Amiga, which
gives a good C programming overview of the entire system. I use
the RKMs for detailed info on particular sections.
-dave
|
| 291.4 | | ECC::JAERVINEN | impersonal name | Fri Feb 06 1987 04:17 | 5 |
| Yes... I knew about those costs *before* buying my Amiga, but I'm
just cheating myself and buying them a bit later... besides, for
the time being, I have enough to do learning the more basic features
of my new toy..
|