Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!erd From: erd@tut.cis.ohio-state.edu (Ethan R. Dicks) Newsgroups: comp.sys.cbm Subject: Faster IEEE-488 devices (was Re: SEQ file access speedup) Message-ID: <35528@tut.cis.ohio-state.edu> Date: 16 Feb 89 05:21:01 GMT References: <89Feb10.182100est.2732@godzilla.eecg.toronto.edu> <7124@killer.DALLAS.TX.US> <7143@killer.DALLAS.TX.US> <1017@csd4.milw.wisc.edu> Reply-To: Ethan R. Dicks Organization: Ohio State University Computer and Information Science Lines: 24 In previous articles, many people put forth suggestions regarding speeding up IEEE transfers. I have not been able to locate one, but Motorola produced (produces?) a chip called the MC68488, an eight-bit I/O bus chip, designed for use with the 6809 which provides full IEEE-488 handshaking and supports the DMA used back in the 6809 days (I don't think it is of much use these days). This chip plus the two chip IEEE-488 buffer set (not the same chips used in the PETs, these chips came one for the data lines, one for the control lines), or the three chip IEEE-488 buffers used in the PETs will provide an IEEE connection, waiting for a peripheral bus to talk to. I have thought about building a prototype card for the C64 or the Amiga, but I have never been able to get a sample of this chip (distributors tend to like to sell $100+ orders) I have literature on this chip. If you are interested, reply and if there are enough requests, I will post a summary of the spec sheets. If there are not enough request, I will e-mail a summary. -ethan -- Ethan R. Dicks | ###### This signifies that the poster is a member in Software Results Corp| ## good sitting of Inertia House: Bodies at rest. 940 Freeway Drive N. | ## Columbus OH 43229 | ###### "You get it, you're closer.