ComRing software also offers network interface for traditional Null-modem. It may be useful for games that don't handle serial link properly.
You should prepare 3-wire ComRing cable:
|TxD||3||2||transmit||connected to RxD of next computer|
|RxD||2||3||receive||connected to TxD of previous computer|
|GND||5||7||ground||common for all computers|
Cable for three computers:
Cable for four computers:
You can use Null-modem cable as two-node ComRing.
To distinguish between different computers in the "network" specify a single letter, identifying your computer. It is the first parameter (and only required) to the packet driver. When you invoke comring a on one computer you can't use a (or A) on others. This letter is used to generate ethernet address.
Number of nodes (computers) is limited to 17.
Syntax is: comring id [parameter]...
You may use following parameters:
com# com port (default: 2) baud=# baud rate (default: 115200, it may be slowed down) nodes=# maximal number of computers connected (default: 3) int=# interrupt for packet driver (hex, default: 60)
If you're using nonstandard port you should specify:
port=# port address irq=# irq number
Example: comring A baud=9600 com1
Note: Comring is supposed to be a DOS program. It's an open
question how to use it with Windows games.
Invoking commands may look like:
comring B com1 baud=57600You should remember: if one computer will not work correctly, the whole network won't work.