Peter Evans
807362e871
Add STZ instruction (to store zero)
2018-02-22 00:02:57 -06:00
Peter Evans
7363547608
Add PHX/Y and PLX/Y to the opcode, addr mode, cycle tables
2018-02-21 23:35:36 -06:00
Peter Evans
8e1ab0e950
Add support for PHX, PHY, PLX, PLY
...
These instructions allow you to push and pull (pop) the X and Y
registers via the stack.
2018-02-21 23:32:57 -06:00
Peter Evans
f9a277e7bc
Add new Branch Always instruction
2018-02-21 21:57:21 -06:00
Peter Evans
58a1e31f58
Allow JMP to work with ABX address mode
2018-02-21 21:46:41 -06:00
Peter Evans
8623945bbf
Add the ability to INC or DEC the accumulator
...
This is an oversight from the 6502 processor that was rectified in the
65c02 model.
2018-02-21 21:20:05 -06:00
Peter Evans
7b65dc1657
Add new BIM instruction (BIt imMediate mode)
...
This is not a real instruction in the 65c02 processor; I invented it for
the sole purpose of handling the specialized logic that is performed by
BIT in IMM mode. To be fair--I can imagine this really _was_ implemented
as a "separate" instruction on the chip! But I don't know that for sure.
2018-02-21 21:01:46 -06:00
Peter Evans
5ba5f91442
Add new address modes for BIT
2018-02-21 20:46:28 -06:00
Peter Evans
e1f11fc266
Add cycle counts
2018-02-21 20:43:04 -06:00
Peter Evans
739451366f
Add zero-page instructions
2018-02-21 20:42:05 -06:00
Peter Evans
48872cf8d1
Add docblock comment for apple2_dd_sector_num
2018-02-21 11:23:25 -06:00
Peter Evans
61eb880f49
Refactor code to pass image type in
2018-02-21 00:23:12 -06:00
Peter Evans
1091ec6e2a
Pass image type into enc_dos; use sector_num instead of a table pointer
2018-02-20 15:36:23 -06:00
Peter Evans
508be6458a
Pass in sector table for logical-physical orders
...
We were not encoding data properly, because in DOS 3.3 and ProDOS,
sectors must be interleaved on disk media (whereas in the original image
form, data is laid out in a linear fashion).
This solves a bug where we erroneously encountered a "bad" opcode (a7)
in the program code.
2018-02-19 18:49:37 -06:00
Peter Evans
015104bd57
Self-sync bytes should be written after a sector header
...
Not after the data field marker, where the controller/RWTS don't expect
to find them.
2018-02-18 23:46:48 -06:00
Peter Evans
0d1e949d13
Mask the result so it's never more than a byte
...
This is because the eff_addr variable is a 16bit one, and adding addr +
X or addr + Y can possibly result in a 9-bit value, which is not what we
want. (You'd be pulling data from the stack instead of the zero page.)
2018-02-16 00:44:55 -06:00
Peter Evans
e9164d9872
Very minor changes to make the code simpler
2018-02-16 00:19:14 -06:00
Peter Evans
058b45e7d1
Use 9-bit rotation, not 8-bit
2018-02-15 19:32:01 -06:00
Peter Evans
067c0cea2f
Also check the N flag (i.e. set it to zero)
2018-02-15 13:01:58 -06:00
Peter Evans
e415b3e490
We should check only the first byte for zero
...
We need to accept values for result that are greater than a byte so that
we can determine if carry is set, but this causes an issue when an app
uses addition to force an overflow that would set the zero bit. Masking
result for only the LSB fixes that problem.
2018-02-15 00:26:21 -06:00
Peter Evans
08b0e2e648
Show effective address
2018-02-14 22:19:35 -06:00
Peter Evans
fe70cd1f71
Remove debugging, use ENC_ETRACK for sector pos max
...
Also, there's no need for a while statement; we can just reset to zero.
2018-02-14 22:09:21 -06:00
Peter Evans
9a5c94bbbb
The 49 opcode is EOR, not ADC.
...
Excuse me, I just need to scream now.
AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
Thank you for your indulgence. Please carry on.
2018-02-14 21:37:02 -06:00
Peter Evans
64b9cbefcb
Several changes to phase and writes
...
1. The phaser algorithm was reworked, and it should be more accurate in
choosing when to step forward or backward.
2. Writes should be committed when the latch has bit 7 high. This hasn't
actually been a problem yet, since other things are broken! But we might
as well fix it now that we've seen it.
2018-02-14 16:49:20 -06:00
Peter Evans
100621a6c6
Show second-digit row mappings for gcr62
2018-02-12 21:20:09 -06:00
Peter Evans
5b1298bded
Document the gcr62 table
2018-02-12 21:19:47 -06:00
Peter Evans
ec522f259e
Add block comments to describe source files
2018-02-12 21:15:20 -06:00
Peter Evans
0822b2f4ba
Use the correct file name
2018-02-12 21:11:50 -06:00
Peter Evans
5c0f65215b
Use the correct file name
2018-02-12 20:18:17 -06:00
Peter Evans
1e3f2e5781
Use the correct name of the source file
2018-02-12 19:28:37 -06:00
Peter Evans
e63d7e5d72
The file is apple2.dd.c
2018-02-12 18:24:35 -06:00
Peter Evans
ba387c004f
We should be dividing, not using modulus
2018-02-11 20:36:41 -06:00
Peter Evans
3e2d8acacf
The same track/sector method works for all images
...
Particularly so as the data segment is now the 6-and-2 encoded form,
which we either encode from DOS 3.3/ProDOS, or use literally from NIB
files.
2018-02-11 20:25:44 -06:00
Peter Evans
9f60e61cfb
Add missing docblock comments
2018-02-09 23:14:05 -06:00
Peter Evans
3223fe6110
Enable disassembly toggle (ALT+D)
2018-02-07 15:24:02 -06:00
Peter Evans
c1cbdb4a43
ALT+P will pause
2018-02-07 14:44:26 -06:00
Peter Evans
308a1070ae
Add paused field, pause execution
2018-02-07 14:44:04 -06:00
Peter Evans
433d9a436f
Add pause function, flesh out machine_info
2018-02-07 14:43:20 -06:00
Peter Evans
a84b4c12e9
Treat pause and disasm as toggle functions
...
This allows us to remove the resume and disasm_off functions. (The
disasm_on function is simply renamed to disasm.)
2018-02-07 14:41:44 -06:00
Peter Evans
91d2267625
Really print out something useful for cpu_info
2018-02-07 00:14:38 -06:00
Peter Evans
3c1709c9b1
Add alt+i (info) option
2018-02-07 00:02:53 -06:00
Peter Evans
97846f5c1a
Configure the DI with all of the standard stuff
2018-02-07 00:02:35 -06:00
Peter Evans
360e9243f8
Use the DI container to get machine/cpu/etc
2018-02-07 00:02:20 -06:00
Peter Evans
09017aa171
Use DI to obtain the reflect struct
2018-02-07 00:01:27 -06:00
Peter Evans
5e7492abdf
Allow mutability if in testing
2018-02-06 23:37:20 -06:00
Peter Evans
4e0892dc86
Add dependency injection container for vm
2018-02-06 23:24:48 -06:00
Peter Evans
524412039a
Implement a dumb stub for cpu_info
2018-02-06 21:10:08 -06:00
Peter Evans
608b2259e5
Break keyboard event logic out into normal/special
2018-02-06 16:29:15 -06:00
Peter Evans
fa5bfe09ae
Add better handling if selected_drive is NULL
...
(Discovered from static analysis)
2018-02-06 14:58:00 -06:00
Peter Evans
0dce7dbc58
Remove unnecessary assignment
2018-02-06 14:37:04 -06:00
