Numeric Data Processor (8087)
WARNING!
The following procedure must be done at a static-free
workstation to avoid damage to the V20 or 8087 components.
INSTALLING THE zSBC 337
1.
Carefully remove the V20 microprocessor chip from the
ZT 8809A while in a static-free workstation. Immediately install
the V20 to the assigned location on the zSBC 337 piggyback
board.
2.
Remove jumper W54 on the ZT 8809A to enable the 8087.
3.
Be sure the additional spacer socket provided by Ziatech is
mounted to the socket pins behind the V20 chip on the
zSBC 337 module.
4.
Apply the 40-pin dual inline socket on the base of the zSBC 337
to the vacated V20 socket on the ZT 8809A. Note also that one
Ziatech-supplied pin, connecting to the zSBC 337 P2-1 (MINT),
is used to bridge the gap created by the extra socket. The
connection from P2-1 may selectively drive interrupt request 0
(IR0) or non-maskable interrupt (NMI) to the processor via J7,
pin 2, whereas P2-2 is not connected to the ZT 8809A CPU.
This pin may be left open. Refer to the descriptions of jumpers
W5 and W51 in Appendix A for proper routing of the 8087
interrupt.
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