-16242 --- OUTDAT
$C08F -16241 STATUS DEVBYT
212 CARD
$C080 -16256 --- ... IRQ 29.12 Hz enable RSRBYT
IRQ 29,12 Hz status TONBYT
Microphone squelch SQ... CON
UART rxd to DEVBYT
UART status overrun error STATUS
UART status framing error STATUS
UART status parity error STATUS
UART s
r.
READING MOUSE DATA
Mouse position and button status data are placed in specific memory locations call... Reserved
$778 + n Button and interrupt status
$7F8 + n Current mode
In the foregoing ad... SE, as explained later.
The button and interrupt status byte conveys the following information, where a b... e following sections. Except for SERVEMOUSE, the status of the carry bit (C) indicates whether or not the
THE INFORMATION IN BETWEEN THESE LINES IS THE STATUS INFORMATION AND
INFORMS YOU OF SUCH THINGS AS C... G
I,J,K OR M, AND WATCH THE ADDR INDICATOR IN THE STATUS LINE. IT WILL TELL YOU
EXACTLY WHAT MEMORY ADDRE... CREMENT AND DECREMENT THE
TRACK NUMBER IN THE STATUS LINE. PRESSING 'R' WILL CAUSE DRIVE ONE TO READ
THE DATA FROM THE TRACK INDICATED IN THE STATUS LINE INTO MEMORY. THE BYTES
ON THE SCREEN WILL
rements PC after popping. RTI doesn't.
o The status bits pushed on the stack by PHP have the breakpoi... The ADC and SBC instructions don't set N,V, and Z status bits if decimal
mode is on. C status is set correctly.
o *An indirect JMP (xxFF) will fail becaus... l, but you can set and
clear all of the other status bits, and there *is* a CLV.
o Personally, I'd
HELPS.
THE 6502 PROCESSOR HAS WHAT IS CALLED A STATUS REGISTER, "P". MOST OF
THE 6502 CPU INSTRUCTIONS AFFECT THE STATUS REGISTER P. FOR EXAMPLE,
IF WE HAD JUST EXECUTED ... PROGRAM COUNTER, STACK POINTER, AND THE PROCESSOR
STATUS REGISTER P.
IF WE WERE TO TALK ABOUT THE APPLE ... ILL PRESENT IN THE ACCUMULATOR.)
THE PROCESSOR STATUS REGISTER P IS RATHER LIKE A BLACKBOARD WHERE WE
M
special logic circuits
-- Used for status of devices at SCSI bus initialization
(including the status of the Apple II SCSI card itself)
4. R... issues calls to the microprocessor to give it the status of the
external SCSI devices and all... operation
1. Commands supported: STATUS, READ BLOCK, WRITE BLOCK, FORMAT,
CO
AMS
5. THE P REGISTER- KEEPS TRACK OF THE SYSTEM STATUS. IT IS DIVIDED INTO BITS, LIKE THIS:
7 6... LAST RESULT DID NOT OVERFLOW
*. UNUSED
B. BREAK STATUS-1 AFTER A BRK COMMAND
D. DECIMAL MODE-0 AFTER CL... R, ROL, ROR
5. COMPARE:CMP, CPX, CPY
6. STATUS:SEC, SED, SEI, CLC, CLV,, CLD, CLI
7. BRANCH
---------------------\
Apple //e Soft Switch, Status, and other I/O locations
\-----------------------... SON Select high resolution graphics
SOFT SWITCH STATUS FLAGS
$C010 R7 AKD 1=key pressed 0=keys free
ROTE DOS, EMPLOYED A SIMPLE WA Y OF RECORDING THE STATUS (FULL OR
EMPTY) OF EVERY SINGLE SECTOR ON THE DIS... S SEEMINGLY MEANINGLESS D ATA ABOUT EACH SECTOR'S STATUS BUT
REMEMBER THAT ALL HEX BYTES ARE COMPOSED OF 8
rm, but I've never made
it very clear what their status was. Partly this is because
the previous environ... on the serial port. Pup ANDs
the contents of the status register with the cd-bit, and if
the result is n