Jumper Configurations
Table A-1
Jumper Descriptions (continued).
JUMPER #
DESCRIPTION
W46(A,B)
Installing W46B allows the printer port
signal Select In* (SLIN*) to control the
speed of operation of the processor via the
Slow/Fast (SLO/F) input to the 82C85 on
ZT 88CT08A and ZT 88CT09A boards only.
ZT 8808A and ZT 8809A boards contain
82C84A parts that do not receive this signal,
and altering the SLIN* bit on these boards
does nothing. Installing W46A disconnects
the SLIN* signal from the 82C85 SLO/F
input, and instead brings the SLO/F input
low to select slow operation of the CPU.
This frees the SLIN* bit for use by the
printer. Removing W46A and B ties the
SLO/F input high to select fast (or normal
speed) operation of the CPU, and frees the
SLIN* bit for use by the printer. Factory de-
fault removes both W46A and B.
W46A
W46B
Function
OUT
IN
Control SLO/F with printer SLIN*
signal (ZT 88CT08A/09A only)
IN
OUT
Printer SLIN* signal free for printer use;
slow mode selected if ZT 88CT08A/09A
OUT†
OUT†
Printer SLIN* signal free for printer use;
fast mode selected if ZT 88CT08A/09A
A-33
