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Chapter 2 - Connecting your Computer
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CHAPTER 2
CONNECTING YOUR COMPUTER
GENERAL
The first steps required are to interconnect your computer with the KAM and get it and the
KAM talking to each other. To do this you must connect the KAM to the computer serial data port
and load your computer with a terminal program. The serial port provides a place for data to be
sent to or received from the KAM. The terminal program is the software which runs in the com-
puter, allowing it to communicate with the KAM or an external device.
If you are using a computer or terminal which operates at the TTL voltage level, you must re-
position the internal jumper K-7. The VIC-20 and Commodore 64 are examples of units which oper-
ate at the TTL level. Refer to page 14 for information on the functioning of K-7. The parts place-
ment diagram on page 70 shows its location. Assembly/disassembly instructions on page 41 show
you how to obtain access to the interior of KAM.
Many computer systems include a terminal program on the system diskette. For example, the
IBM system diskette includes a program named COMM. Other computer systems may include a
terminal program in the initial software package, usually named COMM, TERM, or a similar name
which conveys the idea of communicating. Some computer systems require that a terminal pro-
gram be obtained separately. In general, any program which allows telephone modem communica-
tions with the computer will be suitable for use with the KAM.
We have included several simple terminal programs in an appendix to this manual to assist
you. There are also some names of specific programs available at computer stores which may be
used.
There are generally four variables to be set in your terminal program. These are Baud rate, par-
ity, word length and the number of stop bits. If your terminal program provides for these variables,
use the following settings to talk to the KAM:
Baud rate: 300, 600, 1200, 2400, 4800 or 9600
Parity: None
Data Bits: 8
Stop bits: 1
INTERFACING
Since there are so many computers on the market now, it is impossible to provide interfacing
information on all of them. However, we do provide limited information on some of the more com-
mon ones here.
If you have a PCjr, TRS-Color or a TRS Model 100, some limited information follows:
PCjr:
The IBM PCjr has a built-in terminal program in the basic cartridge. The terminal mode is
started by typing TERM. Consult the PCjr Technical Reference Manual for pin-out requirements for
the PCjr serial port. You will have to buy a special connector from your computer dealer for the
PCjr.
TRS-Color Computers:
The serial port of the color computer uses a 4-pin DIN plug. Pin connections at the port are
shown in the pin table below.
KAM TRS CABLE
2 -------------- 4 -------------- white
3 -------------- 2 -------------- brown
7 -------------- 3 -------------- black