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Chiptunes-pms150c.git
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author
Tobias Girstmair
<tobi@isticktoit.net>
Thu, 4 Mar 2021 14:51:39 +0000
(15:51 +0100)
committer
Tobias Girstmair
<tobi@isticktoit.net>
Thu, 4 Mar 2021 14:51:39 +0000
(15:51 +0100)
bsv.c
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diff --git
a/bsv.c
b/bsv.c
index 353b458fa5c351f06a8019b29fc7ef7be5861724..f62d26a7ad64c40aa8fd7cc5f35d18d2767cd799 100644
(file)
--- a/
bsv.c
+++ b/
bsv.c
@@
-30,8
+30,13
@@
void mod3(void) {
ADD(acc, mod3lo) // (mod3lo & 0xF)
ADD(acc, mod3hi)
mod3lo = acc;
- //mod3lo = mod3hi + (mod3lo>>4) + (mod3lo & 0xF);
- mod3lo = (mod3lo >> 2) + (mod3lo & 0x3);
+
+ AND(acc, 0x3) // acc = (mod3lo & 0x3)
+ SR(mod3lo)
+ SR(mod3lo) // (mod3lo >> 2)
+ ADD(acc, mod3lo)
+ mod3lo = acc;
+ //mod3lo = (mod3lo >> 2) + (mod3lo & 0x3);
mod3lo = (mod3lo >> 2) + (mod3lo & 0x3);
if (mod3lo > 2) mod3lo = mod3lo - 3;
acc = mod3lo;