6502/EightBit
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127 Commits

Author SHA1 Message Date
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
68a785ceec Add an address masking to the memory mapping structure. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-01 23:43:29 +00:00
Adrian Conlon
7af81018c9 Modify rotate and shift instructions to be a little more understandable (6502/6809) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-01 19:47:21 +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
8dbb3eafec Switch to C++17 standard in all EightBit projects. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-10-27 14:28:14 +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
337e35ca1b Use the newly added CPU pokeWord method. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-10-14 20:39:09 +01:00
Adrian Conlon
fe3794e011 Simplify register16_t usage a little. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-09-16 12:00:29 +01:00
Adrian Conlon
7d840f1a42 Modifying the manner in which memory is mapped, allows a fairly clean mechanism for loading Intel "hex" files. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-09-15 14:35:59 +01:00
Adrian Conlon
97272d650d Simplify processor bus access a little by further allowing register16_t address access. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-29 13:52:25 +01:00
Adrian Conlon
a8cc289149 Whoops: The "Bus" class *really* isn't allowed to know the "endianness" of the attached processor! 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-27 11:27:33 +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
3a4235f651 Whoops: The NMI line needs to be powered on by individual processors now it's no longer part of the Processor base class. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-25 22:50:18 +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
535346dede Whoops: missed UNLIKELY specifier on the 6502 processor 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-25 13:17:14 +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
6d4223c368 Start moving towards reset being just another style of interrupt. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-08-25 01:34:30 +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
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
e40240694f More removal of duplicated code. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-24 22:33:02 +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
fbf098ae00 Simplify memory event handlers and ROM recognition a little (bit of speed difference) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-06-10 22:00:52 +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
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
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
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
0a2873c40d Add AllSuiteA test suite (works fine) 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-09 20:18:03 +00:00
Adrian Conlon
ffb945a46d Add some documentation (!) for undocumented 6502 instructions. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-01-07 23:48:27 +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