12
MOTOROLA
3.2 SW2 Options
SW2 is located near the top of the Sandpoint 3 board, near the socketed flash ROM socket, between the
PMC and the floppy connector. This switch controls the features shown in Table 10:
3.2.1 RESERVED
These switches are reserved. On SP3 systems prior to serial #6000, or those without a revision “C” label,
these switches implemented the AMODE arbitration mode select switches. These options are no longer
supported and older SP3 systems should be upgraded.
SP3 exclusively uses the Winbond as the system arbiter; requests are assigned as follows:
WB_REQ(0)
= PMC_REQ(0)
WB_REQ(1)
= SLOT_REQ(1)
WB_REQ(2)
= SLOT_REQ(2)
WB_REQ(3)
= SLOT_REQ(3)
WB_REQ(4)
= SLOT_REQ(4)
And grants are handled correspondingly.
Table 10. Sandpoint 3 SW2 Options
Switch
Name
Definition
Default
1 & 2
RESERVED
none
3
ILEGACY
Interrupt Legacy Modes
4 & 5
IMODE
Interrupt Architecture
6
RMODE
ROM Mode
7&8
USER
User Options