Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!apple!bloom-beacon!ht!spt!mdc
From: mdc@spt.entity.com (Marty Connor)
Newsgroups: comp.sys.ibm.pc
Subject: Need Port Listing for IBM-PC/XT and IBM-PC/AT
Keywords: ibm-pc xt at port listing dma interrupt danke
Message-ID: <186@spt.entity.com>
Date: 11 Oct 88 04:31:13 GMT
Lines: 25


...
Does anyone have or know where I can find a listing of the ports on an
IBM-PC? 

I am trying to do DMA, and have had a lot of trouble finding
information on exactly what port is wired to what device.

Some books have vague stuff about "well, the first fifteen ports are
wired someplace on the DMA controller chip...", but I could really use
a nice list that said stuff like:

  "Port 0x0a is wired to the Mode Register of the 8237 DMA Controller Chip" 

Also if you have a nice short DMA example that explains the sequence
of operations fairly explicitly, I could use that too.  I disassembled
part of the BIOS and *think* I understand, but, some supporting
evidence would be nice.

Thanks for any help.
-- 
----------------
Marty Connor
Director of Innovation, The Entity
mdc@mcp.entity.com, ...{harvard|uunet}!mit-eddie!spt!mcp!mdc