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Completed proof of theory for fast loading. It's just an around-the-back direct-to-file hack for now though.

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This commit is contained in:
Thomas Harte 2016-11-02 21:09:49 -04:00
parent 3e67f3caa6
commit 419629ee6e
1 changed files with 24 additions and 10 deletions
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34
Machines/Oric/Oric.cpp
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@ -40,22 +40,36 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
{
if(address >= 0xc000)
{
if(isReadOperation(operation)) *value = _rom[address&16383];
// // 024D = 0 => fast; otherwise slow
// // E6C9 = read byte: return byte in A
// if(address == 0xe6c9 && operation == CPU6502::BusOperation::ReadOpcode)
// {
// printf(".");
// }
if(address == 0xe720 && operation == CPU6502::BusOperation::ReadOpcode)
if(address == 0xe6c9 && operation == CPU6502::BusOperation::ReadOpcode)
{
while(!_via.tape->get_input())
static FILE *test = NULL;
static int lead_counter = 0;
if(!test)
{
_via.run_for_cycles(1);
_via.tape->run_for_cycles(1);
test = fopen("/Users/thomasharte/Desktop/Soft/Oric/Tapes/Slalom.tap", "rb");
}
if(test && !feof(test))
{
uint8_t next_byte;
// if(lead_counter < 64)
// {
// next_byte = 0x16;
// lead_counter++;
// }
// else
next_byte = (uint8_t)fgetc(test);
set_value_of_register(CPU6502::A, next_byte);
set_value_of_register(CPU6502::Flags, next_byte ? 0 : CPU6502::Flag::Zero);
uint8_t stack = get_value_of_register(CPU6502::S) + 1;
uint16_t return_address = _ram[0x0100 | stack] | (_ram[0x0100 | (stack+1)] << 8);
printf("%02x -> %04x | ", next_byte, return_address+1);
*value = 0x60; // i.e. RTS
}
}
if(isReadOperation(operation)) *value = _rom[address&16383];
}
else
{