Universal PMAC Lite
Jumpers Setup Summary
12
Communication Jumpers
E9-E10, E13-E14: Serial Interface Configuration Control
– The E9, E10, E13, and E14 jumpers
control whether the RS-232 serial port will be in DCE or DTE format. The default configuration permits
straight-across connection to a PC DB-9 serial port.
E44-E47: Serial Baud Rate Selection
–The configuration of these jumpers and the particular CPU
Option ordered will determine the baud rate at which PMAC will communicate through its J4 serial port.
For example, when PMAC is ordered with no CPU Options and only the jumpers E45 and E46 are
installed, the baud rate will be set at 9600 baud.
E49: Serial Communications Parity Control
– Jump pin 1 to 2 for NO serial parity; remove jumper for
ODD serial parity.
E66-E71, E91-E92: ISA Bus Base Address Control
– Jumpers E91, E92, E66, E67, E68, E69, E70, and
E71 on the PMAC Lite determine the base address of the card in the I/O space of the host PC's expansion
bus (consult the Host PC-at I/O Address Map in this manual for details on selecting the appropriate base
address). Together, they form a binary number that specifies the 16 consecutive addresses on the bus
where the card can be found. The jumpers form the base address in the following fashion:
Jumper E91 E92 E66 E67 E68 E69 E70 E71
Bit #
11
10 9 8 7 6 5 4
Dec Value
2048
1024 512 256 128 64 32 16
Hex Value
800 400 200 100 80 40 20 10
If a jumper is ON, the value it contributes to the base address is ZERO.
If a jumper is OFF, the value it contributes to the base address is given in the table above.
On the PMAC Lite, the jumpers are arranged physically in the same order they are presented in the above
table.
From Jumper Configuration to Address
To determine the address specified by a given jumper configuration, use the following formula:
(Decimal)
Address = 2048*E91 + 1024*E92 + 512*E66 + 256*E67 + 128*E68 + 64*E69 + 32*E70 + 16*E71
(Hexadecimal)
Address = $800*E91 + $400*E92 + $200*E66 + $100*E67 + $80*E68 + $40*E69 + $20*E70 +
$10*E71
In each case, Exx = 1 if the jumper is OFF; Exx = 0 if the jumper is ON.
Example:
On a PMAC card, the jumpers are in the following configuration:
E91 E92 E66 E67 E68 E69 E70 E71
ON ON OFF OFF ON ON ON ON
The address can be computed as:
Decimal Address = 0 + 0 + 512 + 256 + 0 + 0 + 0 + 0 = 768
Hex Address = 0 + 0 + $200 + $100 + 0 + 0 + 0 + 0 = $300
Summary of Contents for Universal PMAC Lite
Page 7: ...Universal PMAC Lite Table of Contents iv...
Page 14: ...Universal PMAC Lite Introduction 7 Universal PMAC Lite Dimensions Part Number 602402...
Page 15: ...Universal PMAC Lite 8 Introduction...
Page 23: ...Universal PMAC Lite Jumpers Setup Summary 16...
Page 49: ...Universal PMAC Lite Machine Connections 42...
Page 51: ...Universal PMAC Lite Host PC AT I O Address Map 44...
