Thomas Harte
924de35cf3
Go all in on support for physical shadowing.
2022-06-29 14:39:56 -04:00
Thomas Harte
7cf9e08948
Map shadowing by logical address, not physical.
...
Disclaimer: although this better matches the tests, I've yet to verify.
2022-06-29 06:10:15 -04:00
Thomas Harte
60d3519993
Clarify, attempt to implement as internally documented.
2022-06-28 22:32:31 -04:00
Thomas Harte
6abc317986
Avoid permitting writes in the Cx00 region after uninhibiting the language card.
2022-06-28 16:35:47 -04:00
Thomas Harte
94fcc90886
Use auxiliary switches to control language card area when card is inhibited.
2022-06-28 12:46:31 -04:00
Thomas Harte
7aeaa4a485
Tweak paging semantics, to allow simple multiple dependencies.
2022-06-27 21:38:45 -04:00
Thomas Harte
21842052cf
Alternative zero page should affect bank 0's language card area when the card is disabled.
2022-06-27 07:56:45 -04:00
Thomas Harte
d8e42c4379
Tweak guess at initial state.
2021-09-09 22:06:36 -04:00
Thomas Harte
094d623485
Updates unit tests.
2021-04-05 21:33:04 -04:00
Thomas Harte
0f9ab53ea0
Resolves GCC warnings from dangling Apple IIgs work.
2021-03-21 22:36:18 -04:00
Thomas Harte
4601421aa6
This conditional is gone.
2021-03-03 20:52:01 -05:00
Thomas Harte
2f45e07d82
Further consolidates region map, now that shadowing is orthogonal.
2021-02-28 15:22:36 -05:00
Thomas Harte
496b6b5cfc
Introduces a further 128 bits of storage to eliminate the conditional in IsShadowed.
2021-02-28 15:14:32 -05:00
Thomas Harte
8604b1786e
Simplifies banks $02+ to a single region.
2021-02-27 23:34:51 -05:00
Thomas Harte
631a8a7421
Adds bitset header.
2021-02-27 22:13:49 -05:00
Thomas Harte
7dcb0553e4
Switches to a target-centric view of shadowing.
2021-02-27 22:13:10 -05:00
Thomas Harte
55c9d152e9
Slightly smarter: this does branchless shadowing without additional storage.
2021-02-24 18:46:41 -05:00
Thomas Harte
e42843cca0
This may temporarily exhaust my wit for asserts.
2021-02-16 22:47:46 -05:00
Thomas Harte
3336a123f8
Asserts even more overtly.
2021-02-16 22:33:28 -05:00
Thomas Harte
159924dcc0
More clarity tweaks.
2020-12-10 22:47:11 -05:00
Thomas Harte
5d8f284757
Makes minor style improvements.
2020-12-10 22:11:53 -05:00
Thomas Harte
c978a95463
Increases asserts and adds a test.
...
Thereby discovers and fixes a problem with set_main_paging().
2020-12-10 21:49:23 -05:00
Thomas Harte
6cb71eb11b
This needs explicitly to be a bool for the table lookups to work.
2020-12-06 16:43:07 -05:00
Thomas Harte
55de98fb46
Adds a new statement of intent.
...
Now I need to try to decide whether I like my current all-in-one mapping for shadowing + paging, or whether it's better to split the things. I'm tending towards the latter at least until the functionality works.
2020-12-05 19:09:21 -05:00
Thomas Harte
187f507532
The soft switch is LCBANK2, not LCBANK1.
...
[This also jimmys the IIgs into always entering its extended self test, for now]
2020-11-30 22:35:51 -05:00
Thomas Harte
87069da3dd
Improves exposition, eliminates a couple of redundant map adjustments.
2020-11-30 18:07:03 -05:00
Thomas Harte
5cb4077576
Switches from modulo to and.
2020-11-30 17:47:57 -05:00
Thomas Harte
e9c7e0b9dd
Provisionally reverses meaning of language card RAM bank select.
2020-11-29 21:57:17 -05:00
Thomas Harte
56de2512ae
Adds a further safety assert.
2020-11-25 23:34:30 -05:00
Thomas Harte
69dddf34b9
Adds bonus sanity check.
2020-11-18 19:47:56 -05:00
Thomas Harte
952891d1b6
Improves commentary.
2020-11-16 21:46:35 -05:00
Thomas Harte
e4c5bfdd5c
Takes a repeat shot at proper shadowing.
...
I think the Apple IIgs Technical Reference explains how these bits interact, and I just had inhibit_all_pages off all on my own.
2020-11-16 19:54:12 -05:00
Thomas Harte
dc8d4d49f5
Gives the two sets of switches responsibility for supplying 'state'.
...
(And fixes language-card state value.)
2020-11-09 22:11:20 -05:00
Thomas Harte
46ee98639e
Stubs in $c010.
...
Also reduces memory map logging.
2020-11-04 21:35:11 -05:00
Thomas Harte
9e2a6526d1
Corrects interpretation of bit 3 of the state register.
...
And attempts to be a bit more careful with the language card in general.
2020-11-04 21:15:10 -05:00
Thomas Harte
d3c7253981
Shifts size-limiting of X and Y to transitions and mutations, away from reads.
...
Primarily to remove potential bug-causing complexity — this is easier to debug. But let's see.
2020-11-04 20:35:41 -05:00
Thomas Harte
0178aaee2b
Attempts retroactively to enforce the rule that 8-bit index modes => no top byte.
...
(Rather than a preserved but ignored top byte)
2020-11-02 18:55:28 -05:00
Thomas Harte
45f5896b76
Stubs video switches into the IIgs.
2020-10-31 20:39:32 -04:00
Thomas Harte
0d562699a2
Ensures unmapped regions are really unmapped.
2020-10-29 22:18:01 -04:00
Thomas Harte
94a6da6b7d
Exposes much of the auxiliary and language card stuff to the IIgs bus.
2020-10-28 21:58:20 -04:00
Thomas Harte
0a91ac5af5
Adds some extra notes, starts getting into trying to run the IIgs.
2020-10-27 22:09:45 -04:00
Thomas Harte
ad93ad6018
Attempts to finish off shadowing.
2020-10-27 22:05:04 -04:00
Thomas Harte
0c700094ea
Goes branchless on shadowing.
2020-10-27 21:56:03 -04:00
Thomas Harte
20631a157b
Contorts somewhat in pursuit of branchless shadowing regardless of page and without extra storage.
2020-10-27 21:37:39 -04:00
Thomas Harte
e44f95a882
Takes a first, faltering shot at shadowing.
2020-10-27 19:49:47 -04:00
Thomas Harte
31cd45f8b5
Takes a run at set_card_paging and simplifies method of shadowing.
2020-10-27 19:33:47 -04:00
Thomas Harte
74f9f6ad3b
Tests and corrects ROM access beyond bank $00.
2020-10-27 19:02:15 -04:00
Thomas Harte
1dfdb51e61
Hits a few other easy cases.
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Still to do: card paging, and finding out which banks that applies to, and shadowing. So: everything with flags.
2020-10-26 21:49:47 -04:00
Thomas Harte
18832dc19d
Attempts to expand the language card stuff to all affected pages.
2020-10-26 20:30:41 -04:00
Thomas Harte
3dee0666cb
Corrects current bank $00 language card behaviour.
2020-10-26 17:46:40 -04:00
