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A/W flags of PDR are reset when PAR is written to

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folkert van heusden 2023-03-21 14:02:45 +01:00
parent 406c2a5a09
commit 69118435c4
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 7 additions and 5 deletions
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12
bus.cpp
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@ -541,14 +541,14 @@ void bus::write_pdr(const uint32_t a, const int run_mode, const uint16_t value,
if (word_mode) {
assert(a != 0 || value < 256);
a & 1 ? (pages[run_mode][is_d][page].pdr &= 0xff, pages[run_mode][is_d][page].pdr |= value << 8) :
(pages[run_mode][is_d][page].pdr &= 0xff00, pages[run_mode][is_d][page].pdr |= value);
a & 1 ? (pages[run_mode][is_d][page].pdr &= 0x00ff, pages[run_mode][is_d][page].pdr |= value << 8) :
(pages[run_mode][is_d][page].pdr &= 0xff00, pages[run_mode][is_d][page].pdr |= value );
}
else {
pages[run_mode][is_d][page].pdr = value;
}
pages[run_mode][is_d][page].pdr &= ~(128 + 64 + 32 + 16); // set bit 4 & 5 to 0 as they are unused and A/W are set to 0 by writes
pages[run_mode][is_d][page].pdr &= ~(32768 + 128 /*A*/ + 64 /*W*/ + 32 + 16); // set bit 4, 5 & 15 to 0 as they are unused and A/W are set to 0 by writes
DOLOG(debug, true, "write run-mode %d: %c PDR for %d: %o [%d]", run_mode, is_d ? 'D' : 'I', page, value, word_mode);
}
@ -559,13 +559,15 @@ void bus::write_par(const uint32_t a, const int run_mode, const uint16_t value,
int page = (a >> 1) & 7;
if (word_mode) {
a & 1 ? (pages[run_mode][is_d][page].par &= 0xff, pages[run_mode][is_d][page].par |= value << 8) :
(pages[run_mode][is_d][page].par &= 0xff00, pages[run_mode][is_d][page].par |= value);
a & 1 ? (pages[run_mode][is_d][page].par &= 0x00ff, pages[run_mode][is_d][page].par |= value << 8) :
(pages[run_mode][is_d][page].par &= 0xff00, pages[run_mode][is_d][page].par |= value );
}
else {
pages[run_mode][is_d][page].par = value;
}
pages[run_mode][is_d][page].pdr &= ~(128 /*A*/ + 64 /*W*/); // reset PDR A/W when PAR is written to
DOLOG(debug, true, "write run-mode %d: %c PAR for %d: %o (%07o)", run_mode, is_d ? 'D' : 'I', page, word_mode ? value & 0xff : value, pages[run_mode][is_d][page].par * 64);
}