void
wd_fdc_cr_write( wd_fdc *f, libspectrum_byte b )
{
fdd_t *d = f->current_drive;
wd_fdc_reset_intrq( f );
if( ( b & 0xf0 ) == 0xd0 ) { /* Type IV - Force Interrupt */
event_remove_type( fdc_event );
f->status_register &= ~( WD_FDC_SR_BUSY | WD_FDC_SR_WRPROT |
WD_FDC_SR_CRCERR | WD_FDC_SR_IDX_DRQ );
f->state = WD_FDC_STATE_NONE;
f->status_type = WD_FDC_STATUS_TYPE1;
wd_fdc_reset_datarq( f );
if( b & 0x08 )
wd_fdc_set_intrq( f );
else if( b & 0x04 ) {
d->fdc_index = wd_fdc_wait_index;
d->fdc = f;
}
if( d->tr00 )
f->status_register |= WD_FDC_SR_LOST;
else
f->status_register &= ~WD_FDC_SR_LOST;
wd_fdc_spinup( f, b & 0xf7 ); /* spinup motor, but we do not have a 'h' bit! */
return;
}
if( f->status_register & WD_FDC_SR_BUSY )
return;
f->command_register = b;
f->status_register |= WD_FDC_SR_BUSY;
/* keep spindle motor on: */
event_remove_type( motor_off_event );
if( !( b & 0x80 ) ) { /* Type I */
f->state = WD_FDC_STATE_SEEK;
f->status_type = WD_FDC_STATUS_TYPE1;
f->status_register &= ~( WD_FDC_SR_CRCERR | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ );
wd_fdc_reset_datarq( f );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_i( f );
} else if( !( b & 0x40 ) ) { /* Type II */
if( f->type == WD1773 || f->type == FD1793 ) {
if( !disk_ready( f ) ) {
f->status_register &= ~WD_FDC_SR_BUSY;
f->state = WD_FDC_STATE_NONE;
wd_fdc_set_intrq( f );
return;
}
}
if( f->type == WD1773 && b & 0x02 )
f->data_check_head = b & 0x08 ? 1 : 0;
else if( f->type == WD2797 )
f->data_check_head = b & 0x02 ? 1 : 0;
else
f->data_check_head = -1;
/* WD2797 (and FD1797) can read sectors with non-IBM-compatible
sector length codes */
f->non_ibm_len_code = ( f->type == WD2797 && !( b & 0x08 ) ) ? 1 : 0;
f->state = b & 0x20 ? WD_FDC_STATE_WRITE : WD_FDC_STATE_READ;
f->status_type = WD_FDC_STATUS_TYPE2;
f->status_register &= ~( WD_FDC_SR_WRPROT | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ| WD_FDC_SR_LOST|
WD_FDC_SR_SPINUP );
if( f->type == WD2797 ) fdd_set_head( d, b & 0x02 ? 1 : 0 );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_ii( f );
} else if( ( b & 0x30 ) != 0x10 ) { /* Type III */
if( f->type == WD1773 || f->type == FD1793 || f->type == WD2797 ) {
if( !disk_ready( f ) ) {
f->status_register &= ~WD_FDC_SR_BUSY;
f->state = WD_FDC_STATE_NONE;
wd_fdc_set_intrq( f );
return;
}
}
f->state = b & 0x20 ? ( b & 0x10 ?
WD_FDC_STATE_WRITETRACK : WD_FDC_STATE_READTRACK ) :
WD_FDC_STATE_READID;
f->status_type = WD_FDC_STATUS_TYPE2;
f->status_register &= ~( WD_FDC_SR_SPINUP | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ| WD_FDC_SR_LOST );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_iii( f );
}
}
void
wd_fdc_cr_write( wd_fdc *f, libspectrum_byte b )
{
wd_fdc_drive *d = f->current_drive;
wd_fdc_reset_intrq( f );
if( ( b & 0xf0 ) == 0xd0 ) { /* Type IV - Force Interrupt */
event_remove_type( fdc_event );
f->status_register &= ~( WD_FDC_SR_BUSY | WD_FDC_SR_WRPROT |
WD_FDC_SR_CRCERR | WD_FDC_SR_IDX_DRQ );
f->state = WD_FDC_STATE_NONE;
f->status_type = WD_FDC_STATUS_TYPE1;
wd_fdc_reset_datarq( f );
if( b & 0x08 )
wd_fdc_set_intrq( f );
else if( b & 0x04 )
d->index_interrupt = 1;
if( d->fdd.tr00 )
f->status_register |= WD_FDC_SR_LOST;
else
f->status_register &= ~WD_FDC_SR_LOST;
return;
}
if( f->status_register & WD_FDC_SR_BUSY )
return;
f->command_register = b;
f->status_register |= WD_FDC_SR_BUSY;
/* keep spindle motor on: */
event_remove_type( motor_off_event );
if( !( b & 0x80 ) ) { /* Type I */
f->state = WD_FDC_STATE_SEEK;
f->status_type = WD_FDC_STATUS_TYPE1;
f->status_register &= ~( WD_FDC_SR_CRCERR | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ );
wd_fdc_reset_datarq( f );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_i( f );
} else if( !( b & 0x40 ) ) { /* Type II */
if( f->type == WD1773 || f->type == FD1793 ) {
if( ( ( f->flags & WD_FLAG_BETA128 ) && !f->head_load ) ||
( !( f->flags & WD_FLAG_BETA128 ) && !d->fdd.ready ) ) {
f->status_register &= ~WD_FDC_SR_BUSY;
f->state = WD_FDC_STATE_NONE;
wd_fdc_set_intrq( f );
return;
}
}
if( f->type == WD1773 && b & 0x02 )
f->data_check_head = b & 0x08 ? 1 : 0;
else
f->data_check_head = -1;
f->state = b & 0x20 ? WD_FDC_STATE_WRITE : WD_FDC_STATE_READ;
f->status_type = WD_FDC_STATUS_TYPE2;
f->status_register &= ~( WD_FDC_SR_WRPROT | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ| WD_FDC_SR_LOST|
WD_FDC_SR_SPINUP );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_ii( f );
} else if( ( b & 0x30 ) != 0x10 ) { /* Type III */
if( f->type == WD1773 || f->type == FD1793 ) {
if( ( ( f->flags & WD_FLAG_BETA128 ) && !f->head_load ) ||
( !( f->flags & WD_FLAG_BETA128 ) && !d->fdd.ready ) ) {
f->status_register &= ~WD_FDC_SR_BUSY;
f->state = WD_FDC_STATE_NONE;
wd_fdc_set_intrq( f );
return;
}
}
f->state = b & 0x20 ? ( b & 0x10 ?
WD_FDC_STATE_WRITETRACK : WD_FDC_STATE_READTRACK ) :
WD_FDC_STATE_READID;
f->status_type = WD_FDC_STATUS_TYPE2;
f->status_register &= ~( WD_FDC_SR_SPINUP | WD_FDC_SR_RNF |
WD_FDC_SR_IDX_DRQ| WD_FDC_SR_LOST );
f->rev = 5;
if( wd_fdc_spinup( f, b ) )
return;
wd_fdc_type_iii( f );
}
}