DIGITAL-LOGIC Microspace MSM586SEN - Page 58

DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
58
I/O Ad-
dress
Read/Write
Status
Description
01F6h R / W Drive/Head register for hard drive 0
bit 7 = 1
bit 6 = 0
bit 5 = 1
bit 4 = Drive select
0 First hard drive
1 Second hard drive
bits 3-0 = Head select bits
01F7h R Status register for hard drive 0
bit 7 = 1 Controller is executing a command
bit 6 = 1 Drive is ready
bit 5 = 1 Write fault
bit 4 = 1 Seek operation complete
bit 3 = 1 Sector buffer requires servicing
bit 2 = 1 Disk data read completed successfully
bit 1 = Index (is set to 1 at each disk revolution)
bit 0 = 1 Previous command ended with error
01F7h W Command register for hard drive 0
0200h -
020Fh
R / W Game controller ports
0201h R / W I/O data - game port
0220h –
022Fh
R / W Soundport AD1816 reserved
I/O addresses 0278h - 027Ah are reserved for use with parallel port 2. See the bit defi-
nitions for addresses 0378h - 037Ah.
0278h R / W Data port for parallel port 2
0279h R Status port for parallel port 2
0279h W PnP Adress register (only for PnP devices)
027Ah R / W Control port for parallel port 2
02B0h –
02BFh
R / W Digital I/O for Latch, WDOG, Control
I/O addresses 02E8h - 02EFh are reserved for use with serial port 4. See the bit defini-
tions for I/O addresses 03F8h - 03FFh.
02E8h W Transmitter holding register for serial port 4
02E8h R Receive buffer register for serial port 4
02E8h R / W Baud rate divisor (low byte) when DLAB = 1
02E9h R / W Baud rate divisor ( high byte) when DLAB = 1
02E9h R / W Interrupt enable register when DLAB = 0
02EAh R Interrupt identification register for serial port 4
02EBh R / W Line control register for serial port 4
02ECh R / W Modem control register for serial port 4
02EDh R Line status register for serial port 4
02EEh R Modem status register for serial port 4
02EFh R / W Scratch register for serial port 4 (used for diagnostics)
Continued...