Revamped the opcode table, made the emulator more

efficient, and ported SuBEditor to C.

I revamped the opcode table to add another prefix bit
for the addressing mode, finally giving access to all
addresses, without wasting any bytes.

I made the stack based operations more efficient, by
sort of applying Duff's device to it.

And I ported SuBEditor to C, to make it easier for me
to figure out how to implement SuBAsm.

1 files changed, 151 insertions, 0 deletions

diff --git a/programs/subasm-2.s b/programs/subasm-2.s
new file mode 100644
index 0000000..f77116b
--- /dev/null
+++ b/programs/subasm-2.s
@@ -0,0 +1,151 @@
+; SuBAsm
+; The Sux Bootstrapped Assembler.
+;
+; by mr b0nk 500 <b0nk@b0nk.xyz>
+
+
+.org $A000
+; String Constants.
+prg_name:
+	.byte "SuBAsm"
+ver_txt:
+	.byte ", version "
+ver_num:
+	.byte "0.1"
+
+; Directives.
+dir:
+	.byte "org"
+	.byte "byte"
+	.byte "word"
+	.byte "dword"
+	.byte "qword"
+tok:
+	.byte '.'
+	.byte '#'
+	.byte '$'
+	.byte '%'
+	.byte '('
+	.byte ')'
+	.byte ','
+
+mne:
+	.byte "AAB"
+	.byte "ABA"
+	.byte "ADC"
+	.byte "AND"
+	.byte "ARB"
+	.byte "ASR"
+	.byte "BCC"
+	.byte "BCS"
+	.byte "BEQ"
+	.byte "BNE"
+	.byte "BNG"
+	.byte "BPO"
+	.byte "BRK"
+	.byte "BVC"
+	.byte "BVS"
+	.byte "CAB"
+	.byte "CLC"
+	.byte "CLI"
+	.byte "CLV"
+	.byte "CMP"
+	.byte "CPB"
+	.byte "CPS"
+	.byte "CPX"
+	.byte "CPY"
+	.byte "DAB"
+	.byte "DEB"
+	.byte "DEC"
+	.byte "DEX"
+	.byte "DEY"
+	.byte "DIV"
+	.byte "ENT"
+	.byte "INB"
+	.byte "INC"
+	.byte "INX"
+	.byte "INY"
+	.byte "JMP"
+	.byte "JSL"
+	.byte "JSR"
+	.byte "LDA"
+	.byte "LDB"
+	.byte "LDX"
+	.byte "LDY"
+	.byte "LLB"
+	.byte "LRB"
+	.byte "LSL"
+	.byte "LSR"
+	.byte "MAB"
+	.byte "MUL"
+	.byte "NOP"
+	.byte "OAB"
+	.byte "ORA"
+	.byte "PHA"
+	.byte "PHB"
+	.byte "PHP"
+	.byte "PHX"
+	.byte "PHY"
+	.byte "PLA"
+	.byte "PLB"
+	.byte "PLP"
+	.byte "PLX"
+	.byte "PLY"
+	.byte "RLB"
+	.byte "ROL"
+	.byte "ROR"
+	.byte "RRB"
+	.byte "RTI"
+	.byte "RTL"
+	.byte "RTS"
+	.byte "SAB"
+	.byte "SBC"
+	.byte "SEC"
+	.byte "SEI"
+	.byte "STA"
+	.byte "STB"
+	.byte "STT"
+	.byte "STX"
+	.byte "STY"
+	.byte "TAB"
+	.byte "TAX"
+	.byte "TAY"
+	.byte "TBA"
+	.byte "TSX"
+	.byte "TXA"
+	.byte "TXS"
+	.byte "TXY"
+	.byte "TYA"
+	.byte "TYX"
+	.byte "WAI"
+	.byte "XAB"
+	.byte "XOR"
+
+; Start of program code.
+.org $8600
+subasm:
+	ldb #0
+	lda.w #tok
+	sta.q ptr2
+	tba
+	jsl chk_tok
+
+	jsl chk_mne
+chk_tok:
+	phy #2
+	txy
+	lda (ptr6), y
+	cmp (ptr2), y
+	ply #2
+	cpx #7
+	beq tok_false
+tok_true:
+	inb
+tok_false:
+	stb f
+tok_end:
+	ldb #0
+	rtl
+
+chk_mne:
+	ply #2