DP4Q@TE.CC.CMU.EDU (Drew D. Perkins) (08/19/86)
I'm looking for a card for IBM PC's that supports syncronous/sdlc/hdlc communications up to 64kb. What I have in mind should hopefully have a Zilog SCC (8530) chip, interrupt capability, and fullduplex transmit and receive DMA capability. An onboard processor would be nice but not required. The intended application is running TCP/IP over the line. I'm currently using the Tangent Technologies PC MacBridge card which satisfies all requirements but the transmit dma capability. If anyone knows of another card, PLEASE let me know, I'm getting desperate! Also, If anyone knows of any public domain X.25 LAPB code, I'd also like to hear about it. Preferably written in C. I'd like to provide flow control and error recovery on the 64kb link without reinventing the wheel. Thanks, Drew drew.perkins@te.cc.cmu.edu -------
nhall@CRYS.WISC.EDU (Nancy Hall) (08/29/86)
Drew - Since there seems to be a fair amt of interest in this, I'm posting to the net instead of sending directly to you. I've been looking for full X.25 plp on a card for the AT but (actually for a PC/RT, so things that rely on software running w/ DOS won't do). Here's a brief list of some companies that offer some sort of hardware, many of which I've rejected because of my somewhat restrictive needs (e.g., they offer LAPB on the card but not PLP), but which may be useful to you. Frontier Technologies P.O. Box 11238 Milwaukee, Wisconsin 53211 (414) 964-8689 TCP/IP, X.25, HDLC on the card, w/ interfaces to all levels. Eicon Technology Corp. 3452 Ashby St. Montreal, Quebec H4R 2C1 (514) 333-8543 Based on the Netbios interface. As far as I can tell has HDLC only on the board. Scope, Inc. 1860 Michael Faraday Drive Reston, Virginia 22090 (703) 471-5600 Their DDN Microgateway has HDLC, LAPB, 1822 HDH, X.25 (presumably plp) and TCP/IP on the board. Also have a multibus version. Trisystems 74 Northeastern Blvd. Unit 22 Nashua, NH 03062 (603) 883-0558 HDLC/ LAPB on the board as I recall - better check w/ them on this. ADAX Corp. Berkeley (415) 543-7047 Primitive board X.25/HDLC, TCP/IP, SNA/SDLC in software w/ host overhead. LYNBAR Datacom Products Fort Worth, TX (817) 431-3460 Several products, HDLC, assumes DOS i think. No info about these next few companies; I just received these addresses from other sources but haven't checked them out yet: INS Corp. Mobile, Alabama (205) 633-3270 ABM Computer Systems 3 Whatney Irvine, CA 92714 S-Com Computer System Engineers, Ltd. Tower House High Street Aylesbury, Bucks. HP20 1SQ UK IBM also supposedly has a product announced in Paris but not in the US (?) and I'm trying to find out about it but haven't learned anything yet. I hope this is of some help. - Nancy