Specifications

• Be sure to also set the four drive type jumpers (W26-W29) to specify what kind of floppy
disk drives to
be used, as indicated in Table 2-19 and Table 2-20. Table 2-19 applies to
Drive
A. and Table 2-20 applies to Drive B. Any combination of two drives is allowed.
• On boards that currently ship, jumper W 49 must be shorted. (This configuration is the
default as shipped.)
• If nothing is connected to the SCSI connector (J7) insert a shorting block on J7 pins 1
and 2 to disable attempted system boot from SCSI. This speeds up booting from floppy.
Table 2-18. Floppy Drive Quantity
W33
W32
DRIVES
short short 1
open short
2
short
open
3 (*)
open open
4 (*)
Default: 2 drives
(*)
Not supported,
except with Ampro's
SSD Support Software.
Table 2-19. Drive A Type Selection
CAPACITY TRACKS DRIVE SIZE
DATA RATE
DOS VERSION W26 W28
360K 40
5-1/4"
250 KHz 2.1+
open
open
1.2M 80
5-1/4"
500 KHz 3.0+ open short
nOK 80
3-1/2" 250 KHz
3.2+ short
open
1.44M
80 3-1/2" 500 KHz
3.3+ short short
Default: 36OK, 5-1/4" drive open open
Table 2-20. Drive B Type Selection
CAPACITY
TRACKS DRIVE SIZE DATA RATE DOS VERSION W27 W29
360K 40
5-1/4" 250 KHz
2.1+
open open
102M
80 5-1/4" 500 KHz 3.0+
open short
nOK 80
3-1/2"
250 KHz 3.2+ short open
1.44M
80 3-1/2" 500 KHz
3.3+ short
short
Default:
36OK, 5-1/4" drive
open
open
2-19