2d6878d2a7
Polish VRAM access to TTY TX emulation
...
It assumes Apple BASIC's manner of controlling screen.
Apple BASIC may be able to work exactly like running through
a virtual terminal device.
2014-12-13 02:32:04 +09:00
35bb8b7083
Implement an experimental VRAM to TTY bridge
2014-12-11 04:29:19 +09:00
826647fb93
Update test: now it can run Apple BASIC.
...
]10 PRINT "HELLO"
]20 END
]LIST
10 PRINT "HELLO"
20 END
]RUN
HELLO
]
2014-12-08 04:19:05 +09:00
faacc4ea52
Bug fix: op7e ROR did not store result
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- also fp should be saved as 32bit register
2014-12-08 03:38:58 +09:00
5465cc99d2
Update test.c to check Apple BASIC behaviors
2014-12-08 03:11:03 +09:00
77fa2964f1
Bug fix: stack is hard :(
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SP should wrap correctly on push and pop
2014-12-08 02:43:05 +09:00
729cac78a0
Bug fix: INX did not store the result correctly
2014-12-08 00:46:38 +09:00
42cb53c0ad
Bug fix: after TSX, X got a value >= 0x100
2014-12-08 00:36:42 +09:00
d0ad06c86a
Use 6502_65C02_functional_tests, and two bug fixes
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- transfer operations should update n and z flags
- TSX should transfer SP, not SR
2014-12-08 00:21:49 +09:00
86d07009b1
Add some I/O and memory emulation to check Apple2 BASIC
2014-12-07 18:31:41 +09:00
91c94746d8
Bug fix: manage r12 correctly, and TXS used a wrong register
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To use r12 in assembly code:
- use -fomit-frame-pointer for test.c
- save and restore on calling libc functions
2014-12-07 16:35:46 +09:00
ff1f7b8b2f
Fix branch operation bugs
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- address calculation on not taken
- use macro to implement each branch operation
2014-12-07 14:05:38 +09:00
8d94c76d47
Bug fix on shift operations that set a result to a wrong register
2014-12-07 13:54:47 +09:00
dd372c8a2d
Ready to implement a 6502 interpreter
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All investigation for implementation and testing were done.
Now, 6502.S can be verified on qemu-arm, and run even on LPC1114.
All I have to do is just implement the 6502 interpreter.
2014-12-05 02:43:58 +09:00
Takashi Toyoshima
Takashi Toyoshima