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Extend support.

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This commit is contained in:
Thomas Harte
2025-12-03 17:56:06 -05:00
parent f11e2319eb
commit 1e48689566
2 changed files with 10 additions and 5 deletions
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Machines/Commodore/Plus4/Plus4.cpp
+1 -1
View File
@@ -288,7 +288,7 @@ public:
} else {
value = io_input();
if(!skip_range_) {
if(!skip_range_ && tape_handler_.allow_fast_tape_hack()) {
if(const auto pc = m6502_.registers().pc; pc >= 0x333 && pc < 0x3f2 ) {
skip_range_ = tape_handler_.skip_range(pc.full, m6502_, map_);
}
Machines/Commodore/Plus4/TapeHandler.hpp
+9 -4
View File
@@ -189,18 +189,23 @@ struct TapeHandler: public ClockingHint::Observer {
template <typename M6502T, typename MemoryT>
std::optional<SkipRange> skip_range(const uint16_t pc, M6502T &, MemoryT &map) {
// Check for sequence:
// Potential sequence:
//
// 24 01 BIT 01
// d0 fc BNE 3c8 <- PC will be here; trigger is the BIT operation above.
// 24 01 BIT 01
// f0 fc BEQ 3cc
//
// Also check for BNE and BEQ the other way around.
if(
map.read(pc) == 0xd0 && map.read(pc+1) == 0xfc &&
map.read(pc+1) == 0xfc &&
map.read(pc-2) == 0x24 && map.read(pc-1) == 0x01 &&
map.read(pc+2) == 0x24 && map.read(pc+3) == 0x01 &&
map.read(pc+4) == 0xf0 && map.read(pc+5) == 0xfc
map.read(pc+5) == 0xfc &&
(
(map.read(pc) == 0xd0 && map.read(pc+4) == 0xf0) ||
(map.read(pc) == 0xf0 && map.read(pc+4) == 0xd0)
)
) {
return SkipRange{uint16_t(pc - 2), uint16_t(pc + 6)};
}