System Register Reference - Adaptec AHA-1740A Technical Reference Manual

Appendix C
Register Reference

System Register Reference

Expansion Board IDs
Definition
Host ID 0
Host ID 1
Host ID 2
Expansion Board Control
BMIC Registers
Group 1
Definition
I/O Port Address
BIOS Address
Interrupt Definition
SCSI Definition
Bus Definition
Floppy Definition
Reserved 1
Reserved 2
Mailbox Out Byte 0
Mailbox Out Byte 1
Mailbox Out Byte 2
Mailbox Out Byte 3
Attention
Group 2 Control
Group 2 Interrupt Status
Group 2 Status
Mailbox In Byte 0
Mailbox In Byte 1
Signal EISA Slot
HID0 zC80
HID1 zC81
HID2 zC82
EBCTRL zC84
zC88-zC9F
Signal EISA Slot
PORTADDR zCC0
BIOSADDR zCC1
INTDEF zCC2
SCSIDEF zCC3
BUSDEF zCC4
FLOPDEF zCC5
RESV1 zCC6
RESV2 zCC7
MBOXOUT0 zCD0
MBOXOUT1 zCD1
MBOXOUT2 zCD2
MBOXOUT3 zCD3
ATTN zCD4
G2CNTRL zCD5
G2INTST zCD6
G2STAT zCD7
MBOXIN0 zCD8
MBOXIN1 zCD9
Write/Read
R
R
R
W/R
W/R
Write/Read
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
W/R
R
R
R
R
Continued
C-1