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TransNib V1.00
==============
Devised by Matt Francis (m.p.francis@newcastle.ac.uk)
The disclaimer and copyright information cover all parts of this package.
CREDITS
-------
TransNibAm V3.11 (Amiga front-end) and TransNib64 V2.0 (C64 front-end) by
Matt Francis.
DISCLAIMER
----------
This package comes with no warranty, either expressed or implied. The
author is in no way responsible for any damage or loss that may occur due to
direct or indirect usage of this software. Use this software entirely at
your own risk.
If you damage any of your equipment as a consequence of using a cable
designed in correct or incorrect accordance to the instructions given
elsewhere in this document, I most definitely CANNOT be held responsible.
Having said that, I (the author) have been using this system without
problems for some time now.
COPYRIGHT
---------
This package is freely distributable, BUT all programs and documentation are
copyright 1993 Matt Francis. The ReqTools library is copyright to Nico
François. Permission is NOT given to re-release this package if it has been
altered in any way.
DISTRIBUTION
------------
Permission is given to include this program in a public archive (such as a
BBS, FTP site or PD library) providing that all parts of the original
distribution are kept intact. These are as follows:
TransNib/TransNib.doc
TransNib/TransNib.doc.info
TransNib/TransNib.guide
TransNib/TransNib.guide.info
TransNib/TransNibAm/TransNibAm
TransNib/TransNibAm/TransNibAm.info
TransNib/TransNibAm/TransNibAm.guide
TransNib/TransNibAm/TransNibAm.guide.info
TransNib/TransNibAm.info
TransNib/TransNib64/transnib64
TransNib/TransNib64/transnib64s
TransNib/TransNib64/TransNib64.doc
TransNib/TransNib64/TransNib64.doc.info
TransNib/TransNib64.info
TransNib.info
Libs/reqtools.library
No charge may be made for this program, other than a _reasonable_ copying
fee, and/or the price of the media.
INTRODUCTION
------------
TransNib is a fast, simple parallel data transfer protocol. It was designed
to make linking any type of machine to any other type as easy as possible.
All that is required is six 5V I/O lines at each end. It doesn't matter how
fast or slow each machine is, as the protocol uses a two-line handshake
procedure, ensuring the two machines cannot possibly go out of sync.
TransNib was designed to be used simply to port data from one machine to
another, so the only real requirement is a noise-free link, as there is no
error checking. TransNib has been extensively used, without problems, over
a three metre long cable.
Any two computers supporting the TransNib V1.00 protocol can be linked. So
far, front-ends for the TransNib V1.00 protocol exist for the Amiga and the
Commodore 64.
Anyone who is interested in writing a front end for another platform (or who
has already written one) should contact me first (via e-mail) to discuss
releasing the software as part of the TransNib suite. I will happily answer
any queries about how to implement the TransNib protocol. Obviously, any
documentation for the new program will be included, and full credit will be
given in this document. I am especially keen on getting a TransNib program
written for the PC, but please, contact me before releasing anything.
THE PROTOCOL
------------
In all, six lines are used. Four are data lines, the other two being used
for handshaking. The handshaking lines are designated data-ready (DRDY) and
data-received (DRCV). This method is a trade-off between efficiency and
stability.
At the lowest level, nibbles are transfered as follows. Before a transfer
begins, the sender should pull DRDY low and the receiver should pull DRCV
low. The transfer procedure for one nibble is as follows:
- Receiver starts waiting for DRDY to go high.
- Sender puts nibble on data lines, pulls DRDY high and waits for
DRCV to go high.
- Receiver gets nibble, pulls DRCV high and waits for DRDY to go
low.
- Sender pulls DRDY low and waits for DRCV to go low.
- Receiver pulls DRCV low and loops.
- Sender loops.
The file transfer protocol is extremely simple and is one-way, but allows
for batch sends. The format of data for each file sent or received is as
follows:
- A filename (a string of characters terminated by a zero). A blank
filename (ie. just the terminating zero) signals end of transfer.
The filename must not include a path. Note that it is the
receiver's responsibility to filter/translate the filename as
appropriate.
- The file size N (four bytes in least-significant to most-
significant order).
- N bytes of data.
Software should cater for the "no-files" situation (ie. the first byte
received is zero).
CABLE
-----
Please read the DISCLAIMER section if you haven't already.
These details cover the Amiga<->C64 cable. Cables for other configurations
will differ, but shouldn't be too hard to make up.
You will need:
- 25-pin D-type connector (female) to fit Amiga parallel port.
- 22-pin edge connector to fit C64 user port.
- Some cable (at least six-core, preferably more - eg. nine - in
case extra lines are added in the future).
- Solder, patience etc..
Connect the pins as follows (the numbers correspond to the Amiga's parallel
port. The letters correspond to the C64's user port).
Amiga 2 <-> C C64
3 <-> D
4 <-> E
5 <-> F
8 <-> K
9 <-> L
A ground pin or pins at the Amiga end (pins 18-22 for example) should be
connected to a ground pin or pins at the C64 end (pins 1, 12, A or N for
example).
Note of caution: it is imperative that you don't get the numbers confused!
Secondly, some C64 user-port connectors are a bit dodgy in that they can be
plugged in upside-down if you're not careful. It is advisable that you mark
the upper surface of the plug in some way so it doesn't get put in the wrong
way round (I've seen the consequences of this happening - the C64 survived
perfectly, but the Amiga at the other end got totally geeked).
HISTORY
-------
V1.00 - First public release.