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Author SHA1 Message Date
Adrian Conlon
6c5b595529
Update README.md 2019-02-07 00:01:04 +00:00
Adrian Conlon
f0376fa81e Use macros to define our device pins. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 23:17:54 +00:00
Adrian Conlon
4d08487513 Merge branch 'master' of https://github.com/MoleskiCoder/EightBit 2019-01-14 08:26:42 +00:00
Adrian Conlon
7f853ec73f Add missing 6502 pin events 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 08:26:27 +00:00
Adrian Conlon
a44658ec94 Correct a coulple of newly introduced GB issues. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 02:23:48 +00:00
Adrian Conlon
92d23d82d6 Start big refactor of device/CPU pin usage (to allow pin events throughout). 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 02:10:17 +00:00
Adrian Conlon
9755a5fcd2 Add the concept of a clocked chip 2019-01-10 22:23:51 +00:00
Adrian Conlon
71daf6aa38 Split Chip class into Device and Chip. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-10 20:44:16 +00:00
Adrian Conlon
68030610d8 Move to an event driven clock tick event for all CPUs 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 23:24:33 +00:00
Adrian Conlon
8b187e7614 The clock still has to tick, even while held on RDY low, otherwise cycle timing won't work. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 09:05:12 +00:00
Adrian Conlon
a90ca6ba38 Move RDY initialisation to the CPU power-on sequence. Not strictly correct, but OK. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 00:33:56 +00:00
Adrian Conlon
87d86bcd84 Whoops: missed unneeded method declaration. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 00:08:03 +00:00
Adrian Conlon
01175cf9eb Add support for emulated SYNC and RDY lines. Untested, but feel close. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 23:55:27 +00:00
Adrian Conlon
047babbe7c Rearrange the RESET handler for cycle accuracy. Use more of the general interrupt handler, but with "dummy" stack write access. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 23:09:52 +00:00
Adrian Conlon
25321e78e7 Now that HALT/RESET/NMI/IRQ and BRK have a unified architecture, I think this wraps up the instruction handler of the 6502. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 01:32:43 +00:00
Adrian Conlon
3faec680b0 I think this fixes one of my NES issues. The fix-up required for the PC is handled by the fetchByte associated with the BRK instruction. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-07 01:28:23 +00:00
Adrian Conlon
741e005e0c Add some more 6809 documentation. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-07 01:09:24 +00:00
Adrian Conlon
d7763d8215 Profile mode no longer exists on the 6502 test program. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-07 01:08:23 +00:00
Adrian Conlon
06e2a5c947 Start unifying 6502 interrupt handling. NMI/IRQ/BRK are all doing mostly the same work. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-07 01:06:07 +00:00
Adrian Conlon
b7b7c93a77 This tidies the last of 6502 cycle accurate instruction implementations. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 22:34:53 +00:00
Adrian Conlon
ad644f7013 Tidy the 6502 instruction switch statement a little to lessen the width a little. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 20:51:13 +00:00
Adrian Conlon
c3d2ef51d9 Cycle accuracy for a couple of the indexed write (store) instructions. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 20:39:37 +00:00
Adrian Conlon
4d3be9e756 Use correct boundary crossing conditional for Read/Modify/Write Absolute,X addressing mode. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 12:58:13 +00:00
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
a13ad5042a Correct constructions of register16_t: the structure is "#ifdef"ed for different endian arrangements. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 11:27:43 +00:00
Adrian Conlon
3749585398 Cycle accuracy changes for BRK/RTI instructions. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 11:13:49 +00:00
Adrian Conlon
5b9c348ff1 Remove nodiscard instance where we're using the method for cycle/memory accuracy. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-06 11:10:05 +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
f5125b2a35 Add some documentation regarding instruction cycle timings. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-05 23:21:12 +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
3b7cec9c69 Spot a couple more addCycle patterns. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-04 09:17:59 +00:00
Adrian Conlon
d2e853f101 Explicitly note implied addressing mode instructions. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-04 08:20:23 +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
6c582f6349 Add a working(ish) 6502 ATX implementation. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-30 17:12:45 +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
f38d326ca7 Improve the flexibility of the BUS mapping/read/write architecture. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-29 19:17:36 +00:00
Adrian Conlon
722888ae66 Correct ROM loading issue discovered while resurrecting NES support. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-29 19:06:24 +00:00
Adrian Conlon
2a223a5acd More M6532 documentation added/adjusted 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-03 23:39:22 +00:00
Adrian Conlon
fe1aaf56c7 Add work in progress of M6532 Riot chip. Nowhere near working yet, but includes lots of documentation. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-03 22:54:57 +00:00
Adrian Conlon
d6ebf00ccc Merge branch 'master' of https://github.com/MoleskiCoder/EightBit 2018-12-01 16:46:06 +00:00
Adrian Conlon
679275e930 Correct Linux build errors. 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2018-12-01 16:41:39 +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
cf0828c595 Tidy the Z80 BIT implementation for better code resuse. No functional change 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-12-01 13:01:33 +00:00
Adrian Conlon
802ad6041d Update project README.md 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-29 01:37:53 +00:00
Adrian Conlon
e80a5bfcd4 Whoops: the bit instruction *can* have its return value discarded... 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-29 00:14:44 +00:00
Adrian Conlon
9960ad6012 Tidy return parameter usage a little within the EightBit library. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-29 00:09:40 +00:00
Adrian Conlon
deb9a6d43c Correct more analysis problems. No functional changes. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2018-11-28 21:27:14 +00:00