Bug fix: data was broken on absolute and absolute indexed destination
Now it can show "Apple ][" logo by using Apple BASIC ROM!!
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parent
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18
6502.S
18
6502.S
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@ -245,11 +245,10 @@
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_ldb
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.endm
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.macro _toAbsb
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.macro _toAbsolute reg
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adds r0, PC, #1
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mov TZ, T0
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_ldw
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mov r1, TZ
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mov r1, \reg
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_stb
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adds PC, PC, #3
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.endm
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@ -258,7 +257,7 @@
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adds r0, PC, #1
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_ldw
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add r0, r0, \reg
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mov r1, T0
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mov r1, RA
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_stb
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adds PC, PC, #3
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.endm
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@ -1248,18 +1247,15 @@ op8a: // TXA
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_decode
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op8c: // STY - Absolute
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mov T0, RY
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_toAbsb
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_toAbsolute RY
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_decode
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op8d: // STA - Absolute
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mov T0, RA
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_toAbsb
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_toAbsolute RA
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_decode
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op8e: // STX - Absolute
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mov T0, RX
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_toAbsb
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_toAbsolute RX
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_decode
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op90: // BCC (C==0)
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@ -1296,7 +1292,6 @@ op98: // TYA
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_decode
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op99: // STA - Absolute, Y
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mov T0, RA
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_toAbsoluteIndexed RY
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_decode
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@ -1309,7 +1304,6 @@ op9a: // TXS
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_decode
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op9d: // STA - Absolute, X
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mov T0, RA
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_toAbsoluteIndexed RX
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_decode
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2
Makefile
2
Makefile
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@ -42,7 +42,7 @@ $(ROM).rom:
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# Test binary that runs on qemu user mode emulation for testing
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test: 6502.S test.c
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$(CC) -mthumb -static $(FRAMEPTR) test.c 6502.S -o test && \
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qemu-arm test
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reset && qemu-arm test 2> log
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# Test binary that runs on qemu user mode emulation for functional tests
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ftest: 6502.S ftest.c
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