The Pascal Firmware Protocol Bytes ID are not enough to differentiate an SSC card from a IIgs serial firmware:
http://www.1000bit.it/support/manuali/apple/technotes/misc/tn.misc.08.html
Loading a2(e).ssc.ser on a IIgs succeeds, then goes to limbo when one tries to use the serial port.
Check first byte on the slot's firmware in addition to the four existing ones, as it's supposed to be $2C (BIT instruction) on an SSC card, and $EF (65C816 SEP instruction) on the IIgs' serial firmware (ROM revisions 0, 1, 3).
There is no need to TryToSend before getting the character. We
send bytes during SER_PUT, and if interrupted during sending, we
still try to do it at the beginning of the next SER_PUT.
Apple2 and Atmos have Index in X, but can still use it for the
best-case path as long as we reload it in the worst-case part
(when we assert flow control).
Also, standardize the free space to trigger flow control to 32
characters left (compare with RecvFreeCnt before decrement)
The OSI C1P alternative boot file format works, but the code in the
source listing does not match the ASCII-coded hex translation (which
is actually used). This is confusing to anyone trying to maintain the
code.
Also, the source code did not assemble when ASM is defined.
Also removed use of branch macros and an unnecessary "<" operator.
With these changes the source file should correctly match what
is used at run time.
Tested on real KIM-1 hardware.
read.s:
- Remove commented out line.
- Remove unused check for bell character.
- Remove echo of newline (hardware always echoes entered characters).
- This fixes gets() and fgets() so they return when CR is entered.
write.s:
- Fix check for adding return after linefeed (failed to work because OUTCHR changes A)
- Remove unused check for bell character.
kim1.inc:
- Add symbol for monitor entry
crt0.s:
- Jump to KIM-1 monitor by address rather than using BRK (which relies on vector being set in RAM)
