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DEDHOST.DOC
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1991-03-16
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77 lines
WA8DED Host Mode Interface for G8BPQ Switch
Version 4.03
A facility has being developed to allow applications which normaly operate
in DED Host Mode, using a DRSI card and the DRSI support routine TNCTSR,
to be used with my switch code. An external interface routine DEDHOST.COM
is used to emulate the DRSI support routine TNCTSR. DEDHOST must be run after
BPQCODE. If running with Desqview, DEDHOST should be run in the same window
as the application. Version 4.01 (or higher) of BPQCODE is required. Note that
my code emulates a single DSRI port - multiple comms links may be connected to
the switch, but as far as the application software is concerned, there is a
single (virtual) link to the switch, capable of supporting up to 32 sessions.
BPQCFG.TXT Parameters.
You dont need any TNCPORTs - The config prog will complain, but the switch
will be OK.
MAXCIRCUITS needs to be at least twice the expected number of users.
The code supports 32 streams - if you want to use them all you should have
MAXCIRCUITS=64. (Or more if you are also operating as a switch for other
users).
DEDHOST.COM
This program requires 5 parameters, all are decimal numbers:
Number of Streams.
This defines the maximum number of simultaneous users. The maximum is 32.
Start Stream.
The first stream number to use. The switch supports 64 streams. You must
ensure that each application running with the switch uses a different range
of streams.
Application.
The number allocated to this applcation in the APPLICATIONS param of
BPQCFG.TXT. Will normally be 1 if running a BBS or similar system.
Buffer Space.
The space to be allocated for buffering messages. You can specify up to 60
(Kilobytes). The program will allocate a minimum of 8k even if you specify
less. The space needed will depend on your traffic, and the software you are
using. If running PacketCluster, I suggest you allocate as much as you can
spare, as the flow control within the PacketCluster software is rather
primitive, and it will start disconnecting users if it runs short. Other
systems, such as AA4RE, dont seem to need much.
Interrupt Number.
The Interrupt used by the application to communicate with DEDHOST. Will be
255, unless you need to use that for some other software.
A typical command line would be DEDHOST 32 1 1 60 255
Please note that DEDHOST reads BPQCFG.BIN to find what interrupt to use
to talk to the switch. BPQCFG.BIN must therefore be in the current directory
when DEDHOST is loaded.
John Wiseman, G8BPQ
16/3/91