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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.
-
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- ----------------------------------------------------------------------
-
- 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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