Commit Graph

61 Commits

Author SHA1 Message Date
transistor
3c4e69378a Fixed pty code to actually read input 2021-10-01 17:53:55 -07:00
transistor
a5cac4d309 Fixed indexing, flags, and added logical shift
The effective modes that used signed offsets were not properly
sign extending the immediate or register index values before adding
them to the address, resulting in incorrect addresses.

The flags were incorrect for some instructions, and I added the
logical shift instruction implementation
2021-10-01 15:38:21 -07:00
transistor
f7529bbb41 Added PTY terminal for I/O via the MC68681 module
Also fixed a bug where MOVEA needs to behave differently than MOVE,
such that the data is sign extended to a long and the condition flags
are not changed.  I also modifed how Addressable returns data because
I need to return owned data from MC68681, so that the stored data can
be updated (ie. the status flag must be modified after a read)
2021-10-01 12:25:23 -07:00
transistor
01b4bdf859 Added bit test instructions and got boot message working 2021-09-30 20:27:01 -07:00
transistor
7868bc3014 Fixed instruction decode for MOVEM and EXT
It's now possible to run the monitor program until it loops waiting
for the serial transmitter to be ready for writing
2021-09-30 15:15:23 -07:00
transistor
e40663ee9a Fixed conditionals and split decode and execute cycles for debugging 2021-09-30 12:58:11 -07:00
transistor
b7148d3b06 Added serial device 2021-09-29 23:21:11 -07:00
transistor
92342c23ed More instruction execution, enough to loop
I'm using the monitor.bin binary built from computie to boot the
virtual machine, and it currently runs and loops, but there is no
actual serial device, so it's hard to tell if it's working correctly
2021-09-29 21:52:38 -07:00
transistor
9095333793 Reorganized and started working on the execution code 2021-09-29 17:11:48 -07:00
transistor
f22aa23dfa Completed most of the instruction decode 2021-09-29 12:24:04 -07:00
transistor
6a4f53ca2b Initial start with some structure for instruction decoding 2021-09-28 16:09:38 -07:00