boortz@sics.se (Kent Boortz) (05/29/90)
Is there a cheap, low power, easy to use 300 baud modem chip to use for a home made modem? Yes, I would prefer 1200 or 2400 baud but I suppose they cost a lot more and need more work to get running (or?) I already have a 2400 baud modem (not home made) but my goal this time is to build a REAL small and REAL cheap one. I don't care to talk to the modem, just to call up and connect (no AT command set). Are there solutions without a line transformer? Any suggestions? Kent Boortz boortz@sics.se
don@gp.govt.nz (Don Stokes) (05/29/90)
In article <1990May28.213649.18508@sics.se>, boortz@sics.se (Kent Boortz) writes: > Is there a cheap, low power, easy to use 300 baud modem > chip to use for a home made modem? Yes. There is a chip called the AM7910 (or 7911), produced by AMD. This is almost a complete modem on a chip; just add power, line drivers and go. The chip supports FSK modes: V21 (300bps) V23 (600/1200bps hdx, 1200/75 fdx) and a Bell mode or two. Not sure what the power through this thing is like -- it's been around for a while. Commonly referred to as the "world chip", at least before V22/V22bis became popular. Don Stokes, ZL2TNM / / PSI%(5301)47000028::DON Systems Programmer /GP/ Government Printing Office Postmaster@gp.govt.nz ____________________/ /__Wellington__New_Zealand________________don@gp.govt.nz For every action there is an equal and opposite malfunction.