Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mephisto!gatech!kd4nc!rbdc!barry
From: barry@rbdc (Barry Newberry)
Newsgroups: comp.sys.apple
Subject: Serial Port Hardware Addresses
Summary: I need to enable/disable serial port interrupts
Message-ID: <1990Feb22.060459.7768@rbdc>
Date: 22 Feb 90 06:04:59 GMT
Reply-To: barry@rbdc.UUCP (Barry Newberry)
Distribution: usa
Organization: N.C. Home for Deranged Programmers
Lines: 50


I guess the answer to this question is (partially) in the Apple IIgs
Hardware Reference, but I don't have that book.

Problem : How do I enable/disable Interrupt generation from a serial
     port ? The interrupts should be generated by Transmitter=empty,
     Transmission Received, or Error (according to IIgs Firmware Ref).

I should be able to enable/disable serial port interrupts by reading
or writing to the area from $C080,X to $C08F,X (where X equals the
slot number x 16 : $n0). I would like to enable/disable interrupts
for both the IIgs Serial Port AND the Super Serial Card, since I have
both. I want a Hardware Address Table which is similar to the one
below but giving addresses for Serial Ports.

Table : Disk II Controller   (figure 6.1 from Beneath Apple DOS)

Address   Label      Description
-------  ----------  --------------------------------------------
$C080    PHASEOFF    Stepper Motor Phase 0 Off
$C081    PHASEON     Stepper Motor Phase 0 On
$C082    PHASE1OFF   Stepper Motor Phase 1 Off
$C083    PHASE1ON    Stepper Motor Phase 1 On
$C084    PHASE2OFF   Stepper Motor Phase 2 Off
$C085    PHASE2ON    Stepper Motor Phase 2 On
$C086    PHASE3OFF   Stepper Motor Phase 3 Off
$C087    PHASE3ON    Stepper Motor Phase 3 On
$C088    MOTOROFF    Turn Motor Off
$C089    MOTORON     Turn Motor On
$C08A    DRV0EN      Engage Drive 1
$C08B    DRV1EN      Engage Drive 2
$C08C    Q6L         Strobe Data Latch for I/O
$C08D    Q6H         Load Data Latch
$C08E    Q7L         Prepare Latch for Input
$C08F    Q7H         Prepare Latch for Output

         Q7L with Q6L = Read
         Q7L with Q6H = Sense Write Protect
         Q7H with Q6L = Write
         Q7H with Q6H = Load Write Latch

I plan to use the information to write a program that reads and writes
to the serial port as a "background" task, and I want to be able to do
this on a IIe, as well as a IIgs.

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