Peter Evans
1cec80cead
Don't immediately pause
2018-02-26 13:54:32 -06:00
Peter Evans
f376f00688
Fix scan test not to rely on buggy operand output
2018-02-25 16:16:14 -06:00
Peter Evans
7b3b30a0f2
Use addr2 for ws tests
...
I take it back from the previous commit--the test was written with an
assumption that was not how execute() works
2018-02-25 16:14:05 -06:00
Peter Evans
7ad0ad8024
Unbreak current PC in resume; use addr2 in writestate
...
(Addr1 never worked, so ws was essentially non-functional in practice,
but it passes its tests when you assume execute() does the right thing!)
2018-02-25 16:12:15 -06:00
Peter Evans
aa53fdd77e
Erase strings before we print anything else
...
If you print something without an operand, you may end up printing the
last instruction's operand unless you do that wipe
2018-02-25 16:06:27 -06:00
Peter Evans
67c7790a1a
Show current opcode
2018-02-25 15:52:37 -06:00
Peter Evans
e50fda62be
Add step command
2018-02-25 15:41:37 -06:00
Peter Evans
01f230dc85
Add unbreak command, unbreak_all() function for testing
2018-02-25 14:38:24 -06:00
Peter Evans
c17616c383
Execute will no longer run if PC is at a breakpoint
2018-02-25 14:27:47 -06:00
Peter Evans
588362abee
Add prompt; quit command; breakpoints
2018-02-25 14:25:02 -06:00
Peter Evans
d4891a3fbf
No, really, add the writeaddr command
2018-02-24 19:38:55 -06:00
Peter Evans
09f7152e07
Add writeaddr command
2018-02-24 19:38:04 -06:00
Peter Evans
06bf63ecb2
Add jump debug command
2018-02-24 19:36:02 -06:00
Peter Evans
1be1abc0af
Add printaddr, printstate
2018-02-24 18:57:00 -06:00
Peter Evans
ec253905ad
Add resume command, finder function, arg parser, execute
2018-02-24 16:30:46 -06:00
Peter Evans
a614c1e5df
Add new file, vm_debug.c, and help command for it
2018-02-23 21:58:30 -06:00
Peter Evans
ac5d532a7f
Fix length bug with s_bytes (one too short)
...
This also fixes tests for disassembly so that they account for changed
output. Finally this also exits if we have to perror in the setup
function.
2018-02-23 21:35:53 -06:00
Peter Evans
395ac4a841
Disassembler now outputs more idiomatic code
...
It also no longer prints out register and address state
2018-02-23 20:46:24 -06:00
Peter Evans
0d1e22a348
Add support for decimal mode ADC/SBC.
...
This also corrects a bug where SBC set carry incorrectly in binary mode.
2018-02-23 00:46:07 -06:00
Peter Evans
2669460c6d
Resolve potential bad dereference on sectab
2018-02-22 14:11:54 -06:00
Peter Evans
bee2a0e86a
Add missing docblocks for NP2 and NP3
2018-02-22 14:10:19 -06:00
Peter Evans
978ad1faaf
Formerly "BAD" instructions are now forms of NOPs
...
But weird forms. In most cases they basically are NOPs, except with
different opcodes. In other cases, we call them NP2 and NP3s, and do so
because they consume 2 or 3 bytes respectively (vs. just 1 with NOP).
We had to teach some arcane magic to the emulator for this to work. We
may want to refactor to decouple the number of bytes consumed from the
address mode.
2018-02-22 14:07:05 -06:00
Peter Evans
691387894a
ASL, LSR, ROL, ROR in ABX now consume only 6 cycles
...
(Down from 7 cycles.)
2018-02-22 13:45:36 -06:00
Peter Evans
e35ff91fa7
Clear the decimal bit in BRK; also improve test logic for BRK
2018-02-22 13:44:13 -06:00
Peter Evans
90892c32e4
Add TSB (Test and Set Bits) instruction
...
This commit also moves the TRB code from loadstor to bits, which is
where it should have been all along.
2018-02-22 13:39:48 -06:00
Peter Evans
a4c3d1c4ef
Implement the TRB (Test and Reset Bits) instruction
2018-02-22 00:39:33 -06:00
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
8706a81d1f
Remove spurious printf
2018-02-20 15:55:40 -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
c2e90651ac
Again, latch data must be > 128 (0x80)
2018-02-20 14:44:17 -06:00
Peter Evans
e826fc05d9
We can only write latch data that is > 128
2018-02-20 14:43:33 -06:00
Peter Evans
98f640f0d1
Use the proper sector header length (20 bytes)
2018-02-20 14:35:07 -06:00
Peter Evans
08f3899de4
Tracks don't move from shifting; sector work
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The sector work being:
- We only wrap around if we go beyond the length of an encoded track, so
use ENC_ETRACK.
- If we DO wrap around, we don't use modulus; we simply reset to zero.
2018-02-20 14:33:36 -06:00
Peter Evans
c7fbb4aa50
Backward steps require adjacent phases
2018-02-20 14:30:20 -06:00
Peter Evans
28061c1d11
Adjust length/data for sectors; cleanup some magic numbers
2018-02-20 01:00:46 -06:00
Peter Evans
2318b1917a
This form needs two RORs to work
...
That's because the first ROR pushes the 1 in bit0 into the carry bit;
the second moves the carry bit into the bit7 position, which will match
128.
2018-02-19 22:01:30 -06:00
Peter Evans
d590a809d8
Tests should reflect how carry is handled in ROL/R now
2018-02-19 21:59:55 -06:00
Peter Evans
65f13bb1e4
Add missing output and fix buffer size issue
...
We use BUFSIZ everywhere, except in setvbuf(), which kinda needs to know
the proper buffer size. Because we were passing 256, which is (much!)
lower than BUFSIZ, we were wrapping output around in an odd, unexpected
way.
2018-02-19 21:49:58 -06:00
Peter Evans
9f0d7f5413
Fix some compile failures due to changed params
2018-02-19 20:03:25 -06:00
