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upd765: special case i82072 drive busy bit handling (nw)

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Fixes http://mametesters.org/view.php?id=6689.
This commit is contained in:
Patrick Mackinlay 2017-10-04 20:12:25 +07:00
parent d958e620a2
commit d7dc7f668b
2 changed files with 35 additions and 5 deletions
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37
src/devices/machine/upd765.cpp
View File

@ -1421,11 +1421,10 @@ void upd765_family_device::command_end(floppy_info &fi, bool data_completion)
for(int i=0; i != result_pos; i++)
LOG(" %02x", result[i]);
LOG("\n");
fi.sub_state = IDLE;
if(data_completion) {
fi.main_state = IDLE;
fi.main_state = fi.sub_state = IDLE;
if(data_completion)
data_irq = true;
} else {
else {
other_irq = true;
fi.st0_filled = true;
}
@ -2602,6 +2601,36 @@ void i82072_device::execute_command(int cmd)
}
}
/*
* The Intel datasheet says that the drive busy bits in the MSR are supposed to remain
* set after a seek or recalibrate until a sense interrupt status status command is
* executed. The InterPro 2000 diagnostic routine goes further, and tests the drive
* status bits before and after the first sense interrupt status result byte is read,
* and expects the drive busy bit to clear only after.
*
* The Amstrad CPC6128 uses a upd765a and seems to expect the busy bits to be cleared
* immediately after the seek/recalibrate interrupt is generated.
*
* Special casing the i82072 here seems the only way to reconcile this apparently
* different behaviour for now.
*/
void i82072_device::command_end(floppy_info &fi, bool data_completion)
{
LOG("command done (%s) -", data_completion ? "data" : "seek");
for(int i=0; i != result_pos; i++)
LOG(" %02x", result[i]);
LOG("\n");
fi.sub_state = IDLE;
if(data_completion) {
fi.main_state = IDLE;
data_irq = true;
} else {
other_irq = true;
fi.st0_filled = true;
}
check_irq();
}
void i82072_device::motor_control(int fid, bool start_motor)
{
// check if motor control is enabled

3
src/devices/machine/upd765.h
View File

@ -386,7 +386,7 @@ protected:
virtual int check_command();
virtual void start_command(int cmd);
virtual void execute_command(int cmd);
void command_end(floppy_info &fi, bool data_completion);
virtual void command_end(floppy_info &fi, bool data_completion);
void recalibrate_start(floppy_info &fi);
void seek_start(floppy_info &fi);
@ -469,6 +469,7 @@ protected:
virtual int check_command() override;
virtual void start_command(int cmd) override;
virtual void execute_command(int cmd) override;
virtual void command_end(floppy_info &fi, bool data_completion) override;
virtual void index_callback(floppy_image_device *floppy, int state) override;
void motor_control(int fid, bool start_motor);