6
PCL-848AB User's Manual
2.2.2. Firmware Address Setting
The IBEE-488 interface driver routine is stored in the on-board i EPROM. The
memory address of this firmware can be selected by SW2. The memory segment of
the firmware can be from hex 8000 to s hex FC00. Factory setting is hex D000.
The range of these locations is out of the 640K system memory of i the IBM PC, PC/
XT and PC/AT. However, choice of this location must be made to avoid any conflict
with other interface cards. When two or more IEEE-488 interface cards are used in one
PC, the location settings must be different in order to have different working space
although the firmware code is the same.
The SW2 positions l to 5 determine the address bits Al8 to Al4. ~ Address bit A19 is
always 1. Address bits below A13 (included) are not cared.
Memory Location Segment
SW2-1
SW2-2
SW2-3
SW2-4
SW 2-5
(hex)
A18
Al7
A16
A15
A14
-----------------------------------------------------------------------------------------------------
8000
0
0
0
0
0
8400
0
0
0
0
1
8800
0
0
0
1
0
.
.
Reserved
A000
0
1
0
0
0
.
.
CRT Display
B000
0
l
1
0
0
.
.
Factory Setting
D000
1
0
1
0
0
.
.
System ROM
F000
1
1
1
0
0
FC00
1
1
1
1
1
---------------------------------------------------------------------------------------
* 0 : ON
l : OFF
This multifunction IEEE-488 interface card takes 10K bytes of the memory space
including 8K byte RON and 2K byte RAM. The starting . address of the working
RAM is offset 8K bytes from the ROM starting address.
Summary of Contents for PCL-848A/B
Page 1: ...PCL 848A B MULTIFUNCTION IEEE 488 INTERFACE CARD ...
Page 6: ...Figures Fig 2 2 Location of switches and jumpers 4 Fig 7 1 PCL 848A B Block Diagram 59 ...
Page 65: ...CHAPTER 7 TBEORY OP OPERATION 59 Fig 7 1 PCL 848A B Block Diagram ...
Page 76: ...70 PCL 848AB User s Manual ...
Page 78: ...72 PCL 848AB User s Manual Handshake Timing Sequence ...
