Reading The Status Of The Lambda Dg-4/5; Table 4-7. Parallel Port Numbering And Addressing - Sutter Instrument Lambda DG-4 Operation Manual

REMOTE PC PARALLEL PORT
Pin #
18 GROUND
19 GROUND
20 GROUND
21 GROUND
22 GROUND
23 GROUND
24 GROUND
25 GROUND
Commands may be sent through the printer adapter by using an OUT command from basic,
or an equivalent command from another language. In Microsoft QuickBasic the form of the
command is:
OUT port, data
Where the decimal value of port would be 956, 888, or 632 depending on your system, and
data would be a number indicating the desired command.
The number to use for data either will be one of the FILTER NUMBERS or will correspond
to one of the commands in the table presented earlier in this section. Thus, to command a
move to FILTER NUMBER 4 using a printer adapter having a base address of 888, you would
use the following command:
OUT 888, 4

4.1.7 Reading the Status of the Lambda DG-4/5

The BUSY line is the only output from the Lambda DG-4/5. In the BUSY line section (above),
there is a discussion of some of the factors to consider in deciding whether to read the BUSY
signal at all. If you have determined that your application requires this output to be read
from your computer, this can be done through the 4-bit input port on the printer adapter. The
address of this port will be the base address of the printer adapter plus one.
PORT NUMBER AND LOCATION
LPT1 on Graphics Adapter
LPT1 on Printer Adapter
LPT2 on Printer Adapter
The 4-bit input port uses only the four most significant bits at that address: bits 4, 5, 6 and 7.
Bits 0, 1, 2 and 3 are not used by the printer adapter and will normally read as 1. Bit 7 in this
input port is normally used by the printer to signal that it is "busy". That bit is set by the
data signal from the printer to Pin 11 of the DB-25 parallel port connector on the back of the
computer. The Lambda DG-4/5 uses this same bit in the computer's printer adapter to
Pin Description

Table 4-7. Parallel port numbering and addressing.

LAMBDA DG-4 & DG-5 OPERATION MANUAL – REV. 3.05C (20150414)
LAMBDA DG-4 CONTROLLER
Pin # Pin Description
18 NC
19 NC
20 NC
21 NC
22 NC
23 NC
24 GROUND
25 GROUND
ADDRESS
BASE
956 (3BC HEX)
888 (378 HEX)
632 (278 HEX)
INPUT PORT
957 (3BD HEX)
889 (379 HEX)
633 (279 HEX)
43