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Switches to a proper form of zero-upon-read data.

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Not that it's necessarily correct.
This commit is contained in:
Thomas Harte
2019-06-11 19:53:51 -04:00
parent c8066b01b6
commit ad8b68c998
1 changed files with 9 additions and 4 deletions
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13
Components/DiskII/IWM.cpp
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@@ -58,13 +58,17 @@ uint8_t IWM::read(int address) {
// return 0xff; // return 0xff;
case 0: case 0:
case ENABLE: /* Read data register. */ case ENABLE: { /* Read data register. */
const auto result = data_register_;
if(data_register_ & 0x80) { if(data_register_ & 0x80) {
printf("[%02x] ", data_register_); printf("[%02x] ", data_register_);
// data_register_ = 0; data_register_ = 0;
} }
printf("Reading data register\n"); printf("Reading data register\n");
return data_register_;
return result;
}
case Q6: case Q6|ENABLE: { case Q6: case Q6|ENABLE: {
/* /*
@@ -108,7 +112,8 @@ uint8_t IWM::read(int address) {
// //
case CA0|SEL: // Disk locked (i.e. write-protect tab). case CA0|SEL: // Disk locked (i.e. write-protect tab).
printf("disk locked)\n"); printf("disk locked)\n");
sense = drives_[active_drive_] && drives_[active_drive_]->get_is_read_only() ? 0x00 : 0x80; // sense = drives_[active_drive_] && drives_[active_drive_]->get_is_read_only() ? 0x00 : 0x80;
sense = drives_[active_drive_] && drives_[active_drive_]->get_is_read_only() ? 0x80 : 0x00;
break; break;
case CA1: // Disk motor running. case CA1: // Disk motor running.