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1990-09-20
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TCP-Group Digest Mon, 3 Sep 90 Volume 90 : Issue 128
Today's Topics:
ASM-9812, a V.29 TNC board in Japan.
Send Replies or notes for publication to: <TCP-Group@UCSD.Edu>
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distribution list, et al) to: <ListServ@UCSD.Edu>
Archives of past issues of the TCP-Group Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives".
----------------------------------------------------------------------
Date: Fri, 31 Aug 90 18:06:46 JST
From: kddlab!cll.melco.co.jp!murawaki@uunet.UU.NET (junichi murawaki)
Subject: ASM-9812, a V.29 TNC board in Japan.
To: TCP-Group@UCSD.Edu
A small group of forks in Japan started experimental V.29 operation
with new TNC. It is called ASM-9812, and it was developed by Mr. Kyuushi
Horiuchi (JN3ASM). Device driver for it was written by Mr. Isao Tsukagoe
(JH4HQG), and marged to NOS98 by Mr. Dai Yokota (JK1LOT).
(NOS98 is a ported version of KA9Q package to PC-9801, which is one of
the most popuar personal computer in Japan, by JK1LOT.)
Features of ASM-9812 are as follows;
1) ASM-9812 is a TNC board, consists of Z80 (CPU, SIO, PIO), 27C256
(EPROM), 5256 (SRAM), YM7109C (modem), and some standard logics. Its
configuration is very similar to TAPR's TNC-2, except modem LSI. The
board is designed to settle in an expansion slot of NEC's PC-9801.
CHECKSUM errors have never been detected during NOS98 operation,
because it communicates with PC not serially via ASY line, but
parallely via I/O port. It needs 4 contiguous bytes of I/O address
space, but needs no interrupt vectors at all. The board requires few
system resources, and is very suitable for multi port operations.
JA3PIU uses 3 boards by NOS98 in a background window of MS-window on
his 20MHz 80386, while some prgrams are running in other windows.
2) ASM-9812 uses YAMAHA's YM7109C for modem LSI. The board is designed
to change mdem modes by param command of NOS98.
For example,
param pp0 6 1 ; V.29 9600 bps
param pp0 6 2 ; V.29 7200 bps
param pp0 6 3 ; V.27ter 4800 bps
param pp0 6 4 ; V.27ter 2400 bps
param pp0 6 11 ; Long training sequence
param pp0 6 13 ; Short training sequence
param pp0 6 15 ; No trainig sequence
3) ASM-9812 makes real TXD automatically. Real TXD is calculated by
the length of training sequence, and user defined TXD value. So,
there are no needs to change TXD, when you change modem modes. Also,
it detects training sequences from audio input, and waits the
transmission data to reduce collision of packets.
4) ASM-9812 does not have a NRZ - NRZI conversion circuit between Z80
SIO and modem LSI, because YM7109C has a internal scrambler.
Be care ! ASM-9812 can communicate with ASM-9812 only. It cannot
communicate with any other TNCs, without bypassing its NRZ - NRZI
conversion circuit.
5) ASM-9812 can treat large MTU and window size, greater than 256
bytes. ( Limited to 16k bytes. )
6) ASM-9812 achives very high reproductbility. It has only one
adjustment point, that is audio output level. Audio input level is
automatically adjusted by internal AGC circuit. Connection to the
TRX is the easiest way. No modifications for your radio are needed.
7) ASM-9812 can take two modem LSIs simultaneously, like KPC-4. But no
software supports are available now. And, the board supports KISS
mode only, no TNC-2 like commands are acceptable now. Hardwares were
fully considered about these ploblems, but softwares are under
development. Please wait for the future release.
We held an assembly seminar for ASM-9812 on 12-AUG-1990 at Nara
prefecture. 22 boards are assembled at that seminar. We distributed 100
blank boards at Ham Fair'90 on 25-AUG. And more than 30 boards are
distributed in JA3 area by hand. ASM-9812 blank board is 10,000 Yen.
Complete kit with programmed ROM is 23,500 Yen. ( Assembly seminar's
special price ! Never available again at that price. :-)
Now we are planning to distribute 100 assembled boards to the backbone
sites of ampr-net in Japan.
ASM-9812 needs special ROM codes. It was distributed as an article of
Terakoya news system in LHARCed and ISHed format. JH3USO's ASM-9812
assembly manual and JN3ASM's circuit diagrams were distributed by that
news system, too.
I am using two ASM-9812 boards now, one for 430MHz, and the other for
1290MHz. I feel 7200 bps operation is very comfortable in my location,
where cannot avoid multi-pathes, surrounded by some hills and lots of
buildings. It took about 4 minitues to send 100kbytes file by using FTP
at 7200 bps. Our parameters are MSS=966, MTU=1006, window=1932. I am
planning to add third ASM-9812 for 50MHz or 144MHz QRV.
ASM-9812 developing staffs are JN3ASM, JH4HQG, JK1LOT.
Associate staffs are JH3USO, JA3RSP, JH1FNL, JL3IBG, JA3RAF.
Thanks,
de June Murawaki , JA3RAF , murawaki%cll.melco.co.jp@uunet.uu.net
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End of TCP-Group Digest
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