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git.gir.st - Chiptunes-pms150c.git/blob - bsv.c
7716f957206e91b571e845e7639d20fc1a758ba7
3 typedef unsigned char u8
;
12 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
13 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
16 u8 mod3hi
, mod3lo
; //MEM
19 ADD(mod3lo
,acc
) // mod3lo = hi+lo
21 ADDC0(acc
) // mod3hi, 1bit
27 AND(acc
, 0xf) // (mod3lo>>4)
28 XCH(mod3lo
) // acc=mod3lo, mod3lo=mod3lo>>4
29 AND(acc
, 0xF) // acc=mod3lo&0xf, mod3lo=mod3lo>>4
30 ADD(acc
, mod3lo
) // (mod3lo & 0xF)
34 AND(acc
, 0x3) // acc = (mod3lo & 0x3)
36 SR(mod3lo
) // (mod3lo >> 2)
39 //mod3lo = (mod3lo >> 2) + (mod3lo & 0x3);
40 mod3lo
= (mod3lo
>> 2) + (mod3lo
& 0x3);
41 if (mod3lo
> 2) mod3lo
= mod3lo
- 3;
46 u8 notes_ix
= acc
& 0x7;
49 u8 result
= ((i1
<<8|i0
)*notes
[notes_ix
])>>8; // keep hi byte
57 MOV (acc
, i2
)// "mov mem,mem"
58 MOV (n
, acc
)// does not exist
78 MOV (tmp_1
, acc
) // fresh tmp_1:
83 OR (acc
, tmp_1
) // tmp_1 done.
99 MOV (tmp_1
, acc
) // acc saved in tmp_1; fresh acc
101 // shift-divide by six
102 // note: i2 is max 0x78; so acc will <= 20. (breaks vor values >=128)
115 AND (acc
, tmp_1
) // acc restored from tmp_1
120 mod3lo
= i2
<<6|i1
>>2;
127 MOV (tmp_1
, acc
) // acc saved in tmp_1; fresh acc
129 // shift-divide by ten
130 // note: i2 is max 0x78; so acc will <= 12.
143 AND (acc
, tmp_1
) // acc restored from tmp_1
152 i1
+= !i0
; // ADDC i1
153 i2
+= !i1
&& !i0
; // ADDC i2