6502/EightBit
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82 Commits

Author SHA1 Message Date
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
ed76038bfa More memptr adjustments 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-17 13:59:59 +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
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
7531f8a24a Remove extra stdafx include (Signal.h) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-05-25 22:38:12 +01:00
Adrian Conlon
4b4f6b1a49 Some *small* consistency changes. Perhaps some performance gains. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-04-11 23:53:26 +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
dac58b121a More small tidyups in the core emulator set. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-03-12 01:22:28 +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
d34b161255 Simplify some build options. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-02-19 23:18:21 +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
4bd1a1eab1 M6502: Couple of small C++ usage changes: shouldn't be any functional effects. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-12 23:32:06 +00:00
Adrian Conlon
177dbbcd33 Tidy 6502 PLP implementation a little. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-12 20:39:15 +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
08d742e336 Linux compatibility changes. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-06 22:18:02 +00:00
Adrian Conlon
2311ea98c6 Add preliminary Linux support for 6502 builds. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-06 21:37:03 +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
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
5f54f61514 Undocumented variant of SBC added. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-01 12:55:47 +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
eb40c0865e Started added undocumented instructions: first the NOPS (single, double and triple byte variants, including cycle variations). 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-31 14:41:00 +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
8e4030a5aa Add some performance hints to conditionals. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-29 14:56:26 +00:00
Adrian Conlon
412a44fafd Correct some page crossing conditions affecting 6502 cycle counts. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-29 14:49:53 +00:00
Adrian Conlon
0604d5cf22 Actually, all 6502 getWord usage has an invariant high page indicator. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-29 11:50:24 +00:00
Adrian Conlon
7432e602f8 Correct a 6502 bug in absolute indirect addressing mode (unchanging page on address resolution). 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-28 16:15:22 +00:00
Adrian Conlon
1946b7ef39 Correct a couple of flag anomalies in the 6502 processor highlighted by NESTEST 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-28 15:53:30 +00:00
Adrian Conlon
dcf99bf65d Zero page indirection should completely ignore the high byte of the address line. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-28 15:16:21 +00:00
Adrian Conlon
bfa1c07ea4 Change a couple of small formatting quirks in the disassembler to better match "nestest". 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-28 14:18:17 +00:00
Adrian Conlon
81ed53ce11 First stab at a Ricoh 2A03: A 6502 minus decimal mode support. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-25 23:34:56 +00:00
Adrian Conlon
1edabd79f3 More pinout oriented method of executing instructions (especially interrupts) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-10 21:41:48 +00:00
Adrian Conlon
23f7a88480 Further 8080/Z80 interrupt rewrite 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-12-03 00:57:47 +00:00
Adrian Conlon
c513f0cab1 GSL was too problematic when used with GCC. Removed. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-11-20 19:17:49 +00:00
Adrian Conlon
67c27d4a3e GSL + CPP core guidelines changes. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2017-11-18 14:29:30 +00:00