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baf32cef89
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87 Commits

Author SHA1 Message Date
Adrian Conlon
baf32cef89 Get the memory access more correct for more of boundary crossing indexed addressing modes. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 12:17:43 +00:00
Adrian Conlon
3337f57747 More cycle accuracy changes, concentrating on stack operations. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-05 23:21:43 +00:00
Adrian Conlon
143e9a9e68 More cycle accuracy changes: 
1) implied instruction, pointless fetch
 2) branch pointless fetch when condition is met

Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-05 17:23:50 +00:00
Adrian Conlon
556e06426e Further work on the slow migration to a cycle accurate 6502 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-03 01:04:12 +00:00
Adrian Conlon
5ade05a689 Add a bunch of undocumented 6502 instructions. Abandoned ATX implementation. Too poorly documented. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-30 12:01:23 +00:00
Adrian Conlon
815c99710a Add enough undocumented 6502 instructions to get through "nestest". 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-29 22:22:31 +00:00
Adrian Conlon
c136b306ab Use the new busRead/Write processor methods to simplify the 6502 cycle counting. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-29 22:18:01 +00:00
Adrian Conlon
adb60a6e90 Port the 6502 to the new bus architecture. 2018-12-29 19:40:02 +00:00
Adrian Conlon
dc477cd050 Use explicit enumeration types (improves type safety) where appropriate. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-01 15:24:29 +00:00
Adrian Conlon
003cea0d64 Make 6502 symbols code a little more like normal C++ 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-04 13:27:43 +00:00
Adrian Conlon
8ef5d97366 Update boost from 1.65 -> 1.68 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-04 12:58:01 +00:00
Adrian Conlon
4dc0becb74 Refactor the 6502 implementation to be a lot more like the MC6809. Hopefully show bugs in the latter a little more easily. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-10-31 23:29:13 +00:00
Adrian Conlon
fac2da9ac4 Start refactoring CPU cores to use C++17/14 features. (This commit covers the 6502 and Z80) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-10-27 18:41:55 +01:00
Adrian Conlon
1b2ddd8843 Don't expose the bus via the CPU any more: if a component needs the bus, it should be prepared to hold a reference to it. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-10-20 20:52:41 +01:00
Adrian Conlon
735f70e717 Remove a couple of unused headers from the 6502 processor. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-26 19:06:00 +01:00
Adrian Conlon
1212e8d4f0 Tidy some processor virtual specifications. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-25 13:35:53 +01:00
Adrian Conlon
c105ee37bf Have a stab at sorting out processor pin handling. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-25 12:09:26 +01:00
Adrian Conlon
b0aacce406 Tidy header file usage a little. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-18 23:56:16 +01:00
Adrian Conlon
cc64e114a9 Start refactoring the processor classes to allow big/little endian processors to be specified. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-17 21:53:49 +01:00
Adrian Conlon
70c70af969 Sort out some exception and member initialisation rules. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-11 21:19:19 +01:00
Adrian Conlon
cac871cf2b Remove duplicated code (from const definitions) the performance benefit isn't worth the amount of duplicated code. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-24 20:58:20 +01:00
Adrian Conlon
d27b490d4c (Hopefully) fix compilation issue on g++ 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-16 09:53:44 +01:00
Adrian Conlon
67487b5b6e Simplify the usage of the register16_t union. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-16 00:55:32 +01:00
Adrian Conlon
3e854c7c49 Const some more bus/processor usage, and ensure the data bus is a member, not a reference to memory. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-10 00:40:56 +01:00
Adrian Conlon
d818095815 MEMPTR is really only a concept of Intel style processors. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-03-18 22:40:23 +00:00
Adrian Conlon
45dc274167 Get rid of wrappers for bus access: i.e. make it clearer where the bus is being read/written. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-03-10 01:53:57 +00:00
Adrian Conlon
c6eb68ba13 Further return by value, rather than reference. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-02-26 19:47:35 +00:00
Adrian Conlon
adf506a41e Optimisation: Prefer return by value to return by reference. ~10% speed-up! 
Just watch a video by Chandler Carruth from 2015, where he talked about C++ optimisers...

Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-02-25 19:48:01 +00:00
Adrian Conlon
1bf2a9bdfb 6502, Disassembly: Some dump methods can be static 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-27 10:13:17 +00:00
Adrian Conlon
9124f10008 6502: Implement some more undocumented instructions (for the Blargg nes cpu tests) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-21 10:45:25 +00:00
Adrian Conlon
b5fee5b5d9 Make explicit the notion of page based loads in M6502. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-18 21:17:45 +00:00
Adrian Conlon
21bd8a06e6 Power on conditions are chip specific and *not* directly related to construction/destruction. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-18 17:50:15 +00:00
Adrian Conlon
19aea5244b The vector of instructions was good, but a switch is fastest and probably easiest to read/modify. (Running at 101Mz, 32M instructions per second) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-17 22:17:08 +00:00
Adrian Conlon
d57cb8c9be 6502: I might regret this, but move to a vector of instructions, rather than decoding them one at a time 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-16 23:54:43 +00:00
Adrian Conlon
43573ac699 6502: Rotate and shift by value, not reference. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-14 21:03:29 +00:00
Adrian Conlon
ac95670cfc Add support for 6502 pin 38 (SO: set overflow) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-12 20:13:35 +00:00
Adrian Conlon
847e07be86 Add undocumented 6502 instruction RRA. nestest.nes now runs to completion: Hurrah! 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-07 23:42:26 +00:00
Adrian Conlon
4d9c0b490a Add undocumented 6502 instruction: SRE 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-07 23:16:24 +00:00
Adrian Conlon
65b856611e Undocumented 6502 instruction RLA added. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-07 22:50:14 +00:00
Adrian Conlon
5b62a6b70b Sort out M6502 precompiled headers. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-06 23:19:29 +00:00
Adrian Conlon
5c3568aebd Undocumented instruction: SLO added 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-04 22:46:44 +00:00
Adrian Conlon
cb89eb8c82 Add undocumented 6502 instruction: ISB 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-04 21:47:50 +00:00
Adrian Conlon
12565966de Remove some assertions from the 6502 implementation. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-02 23:24:52 +00:00
Adrian Conlon
4d5afb67a3 Refactor the 6502 code a little. No functional changes and tests still seem to work. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-02 21:20:47 +00:00
Adrian Conlon
345ab2e2c6 Undocumented instruction: DCP added 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-01 21:05:42 +00:00
Adrian Conlon
1beee9782f Undocumented instruction: SAX added 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-01 12:46:21 +00:00
Adrian Conlon
75aece30e3 Undocumented instruction: LAX added. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-01 12:28:00 +00:00
Adrian Conlon
d4c08b2a25 Use portability macros in the 6502 disassembler. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-01 01:16:22 +00:00
Adrian Conlon
82fe35891d Linux compatibility changes 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-30 15:22:27 +00:00
Adrian Conlon
2683999e2c Mild refactoring, no functional change... 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-30 14:33:48 +00:00