58 lines
1.5 KiB
NASM
58 lines
1.5 KiB
NASM
;;
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;; inline function: unparse_base10
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;;
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;; argument: m2[0]
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;; return: base10 + 16 in m3[56 - 63]
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;; requires: div10_unsigned
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unparse_base10:
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;; clear end of m3
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mov (64 - 8),ct3
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mov 7,lop
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lps
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mov 0,mc3
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mov (64 - 8),ct3
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;; output: m3
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unparse_base10_loop:
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mov 0,ct2
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mvi div10_unsigned,pc
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;; [X ] [Y ] [D1 ]
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mov mc2,y mov 1,lop ; mvi imm,pc delay slot (executed twice)
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;; after function return:
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mov all,mc0 ; m0[1] (1234)
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mov all,pl
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;; mod10: multiply by 10:
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sl mov alu,a
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sl mov alu,a
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sl mov alu,a
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add mov alu,a
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add mov alu,a mov 0,ct0 ; restore ct0 after 'mov all,mc1'
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;; a: 12340
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mov mc0,a mov all,pl
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;; a: 12345 m0[0]
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;; p: 12340
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;; mod10: subtract (a - p)
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sub mov alu,a mov 16,pl
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;; a: 5
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;; convert to vdp2 character
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add mov alu,a
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;; store digit in m3
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mov mc0,p clr a mov all,mc3 ; m0[1]
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;; p: 1234
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;; a: 0
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add mov alu,a mov 0,ct0
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;; a: 1234
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jmp nz,unparse_base10_loop
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mov all,mc0 ; jmp delay slot
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