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Commit Graph

138 Commits

Author SHA1 Message Date
Peter Evans
c946eb3f69 Fix incorrect stack info
(The previous behavior of RTS/JSR was not right.)
2018-01-23 21:35:59 -06:00
Peter Evans
2e334e2ee1 Update tests with correct expected text from disassembler 2018-01-23 21:19:26 -06:00
Peter Evans
80136e9360 Most status flags are now set when the CPU is created 2018-01-23 20:41:48 -06:00
Peter Evans
0b03fd24f5 Carry must also be factored in 2018-01-23 20:26:01 -06:00
Peter Evans
5656b271ee Account for carry being set by default 2018-01-23 16:30:52 -06:00
Peter Evans
746e2246b3 Set negative and unset zero since the operand >= A 2018-01-23 16:29:53 -06:00
Peter Evans
3c7002c6c7 Carry is only unset if the operand >= A 2018-01-23 16:29:08 -06:00
Peter Evans
dc97a6996e Account for carry being set by default 2018-01-23 16:28:39 -06:00
Peter Evans
b02679f6a0 Carry must be unset 2018-01-23 16:26:05 -06:00
Peter Evans
522905b39c Carry must be unset in this test 2018-01-23 16:24:46 -06:00
Peter Evans
60ff0e5781 Carry is set by default now 2018-01-23 16:24:16 -06:00
Peter Evans
a3598ecd16 The stack pushes from the end of the page now 2018-01-23 16:21:43 -06:00
Peter Evans
8edf83f7ad Carry is set only if the result is > 0xFF 2018-01-23 16:20:33 -06:00
Peter Evans
8133781fd3 Use the address mode enum itself 2018-01-23 16:18:22 -06:00
Peter Evans
7a0ea50aa3 The stack now only works with 8bit values; disable carry 2018-01-23 16:16:59 -06:00
Peter Evans
ef13fe4ef1 Require STATUS_DEFAULT, stack pointer at ff 2018-01-23 16:07:21 -06:00
Peter Evans
2f777ce881 Several core changes to status, soft switches
Regarding soft switches, we had several we should have been listening
for on both reads and writes, but were only doing so on writes; this is
now fixed.

Regarding statuses, we were incorrectly calculating both carry and
overflow. This should now be fixed, although some quick examinations of
disassembly output suggest there is something else amiss. Debugging will
continue shortly.
2018-01-20 21:01:26 -06:00
Peter Evans
2c319399d2 Change disassembly to add more info 2018-01-19 00:34:57 -06:00
Peter Evans
96b8b77f37 Use apple2.tests.h for setup/teardown 2018-01-17 15:31:12 -06:00
Peter Evans
c8dbf1c84c Add missing tests for new vm_screen functions 2018-01-17 15:16:12 -06:00
Peter Evans
53f40ff960 Add tests for apple2.kb.c 2018-01-17 14:58:42 -06:00
Peter Evans
6670df930b Remove unnecessary functions and tests 2018-01-17 14:02:37 -06:00
Peter Evans
8d4283b1dc Add first work on keyboard support
Mainly the switch_read function, which had necessitated some work done
in the vm_screen area
2018-01-16 23:50:02 -06:00
Peter Evans
2c39120098 Rename video_mode -> display_mode
This also changes the _kind_ of field from an incrementally enumerated
one to a collection of bit flags.
2018-01-16 16:13:50 -06:00
Peter Evans
bcf6b213a6 Account for changes to rom segment structure 2018-01-16 15:46:35 -06:00
Peter Evans
caea83f9c6 Add missing unit tests for pc mapper functions 2018-01-16 14:22:08 -06:00
Peter Evans
a0a5132099 Add pc file for peripheral card ROM 2018-01-15 23:50:33 -06:00
Peter Evans
be23bb7166 Remove unneeded test stub 2018-01-13 15:57:02 -06:00
Peter Evans
cadc19b3e5 Add display buffer read/write mappers 2018-01-13 15:40:40 -06:00
Peter Evans
45eb7b5e58 Add zero page memory mapper functions
This also adds tests for those functions. We have, furthermore, removed
some redundant (and non-externed!) functions from apple2.mem.c which was
the old bank switching code that got moved to apple2.bank.c.
2018-01-13 00:38:29 -06:00
Peter Evans
3738d70a43 Switch bank code into its own file 2018-01-12 22:06:49 -06:00
Peter Evans
c953616a71 Finish refactor to separate bank_switch and memory_mode
There is one failing test, which I expect to fail at this point; that's
because we need to write a read/write map function for the stack and
zero page so that they use aux memory when BANK_ALTZP is on, and main
memory when not.
2018-01-12 21:04:21 -06:00
Peter Evans
647139924b Small comment 2018-01-12 14:51:00 -06:00
Peter Evans
f69454c965 Some soft switches now require consecutive reads
To allow this to work, we had to allow the CPU struct to record what the
last opcode/operand/address were, although in truth we only needed the
last address.
2018-01-12 14:49:27 -06:00
Peter Evans
7d6886a3a8 Change last_addr field to eff_addr 2018-01-12 13:57:48 -06:00
Peter Evans
1b2e9d952b Add missing test code for the aux bank switch 2018-01-11 22:35:23 -06:00
Peter Evans
c4c0312402 Add missing tests for read/write bank switches 2018-01-11 22:24:19 -06:00
Peter Evans
6d21774e78 Add missing tests 2018-01-11 21:58:17 -06:00
Peter Evans
578e0b291c Allow us to switch main/aux; write bank switch mappers 2018-01-11 19:52:13 -06:00
Peter Evans
9d2f9b6f60 Refactor to remove ram2
Both main and auxiliary memory need to keep an extra 4k of memory that
is bank-switchable, so we have changed to store that memory literally
within the main and aux segments.
2018-01-11 13:19:17 -06:00
Peter Evans
288b4a9e8d The boot procedure no longer defaults bank_switch to 0 2018-01-10 21:50:43 -06:00
Peter Evans
8d9b48912e Add memory injection to 6502; main memory in apple2
Note that memory _is_ now managed in apple2, and _not_ in mos6502.
2018-01-10 21:28:05 -06:00
Peter Evans
3db536a83d Change memory_mode -> bank_switch
This also changes the concept of the field; bank_switch is a collection
of bit flags now.
2018-01-10 19:59:33 -06:00
Peter Evans
fcba14f91b Add set16 function 2018-01-10 16:43:14 -06:00
Peter Evans
7f6b8d3587 We can no longer assume PC increments during address handling
This change required a number of consequent changes to assumptions we'd
made, and I'm not 100% confident we have things right at this point in
time.
2018-01-09 20:59:14 -06:00
Peter Evans
04aab568df Oh, little-endian issues; you are my bane 2018-01-09 16:28:14 -06:00
Peter Evans
68b1b79549 Added a "fix" to JSR test.
It's really wrong, because we _should_ be storing PC + 2 in the stack.
And software's definitely gonna bork when we try emulating them, because
they will invariably inspect the stack and assume that's what we have in
there.

But the proper fix is to not actually do next_byte(), and to never
advance PC outside of the execute function. But that's a bigger change
than I want to do at this specific moment.

So, in the meantime, you have me prattling on in a commit message. Lucky
you!
2018-01-09 16:26:21 -06:00
Peter Evans
b492b44e0c We have a raft of changes here...
1. In some cases we corrected little-endian issues.
2. In others, we need to correct expected output to account for PC,
cycles and hex dumps.
2018-01-09 16:24:51 -06:00
Peter Evans
7e51339b88 Account for incremented PC byte in rel tests 2018-01-09 16:06:41 -06:00
Peter Evans
4beff0bff8 Remember that we must obey little-endian order 2018-01-09 16:00:15 -06:00