Article View: comp.os.msdos.programmer
Article #418Re: 8237A DMA Chip on the PC
From: Ralf Brown
Date: Wed, 22 Jul 1992 01:51
Date: Wed, 22 Jul 1992 01:51
19 lines
1315 bytes
1315 bytes
In article <tfiske.711742881@qualcom> tfiske@qualcom.qualcomm.com (T.J. Fiske) writes: }The 8237A DMA chip on the PC: }on the AT and higher models, there are 8 dma channels. }I need to program channel 5, since I need to do 16 bit }dma transfers. Anyways, to progam the target address }correctly, it needs a "page" address at port 0x8b. }What is this page address, and how can I do an address The high eight bits of the 24-bit linear address, which you compute as ((long)segment)<<4 + offset (of course, this computation applies only in real mode) -- Internet: RALF+@CS.CMU.EDU |The University would disclaim this if it knew... FIDO: Ralf Brown 1:129/26.1 |"Wisdom is the quality that keeps you from BIT: RALF%CS.CMU.EDU@CARNEGIE| getting into situations where you need it." AT&Tnet: (412)268-3053 school| -- Doug Larson
Technical Details
Message-ID:
<1992Jul22.015106.230532@cs.cmu.edu>Path:
arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!udel!rochester!cantaloupe.srv.cs.cmu.edu!ralfReferences:
<tfiske.711742881@qualcom>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!udel!rochester!cantaloupe.srv.cs.cmu.edu!ralf From: ralf+@cs.cmu.edu (Ralf Brown) Newsgroups: comp.os.msdos.programmer Subject: Re: 8237A DMA Chip on the PC Keywords: 8237A DMA Chip on the PC Message-ID: <1992Jul22.015106.230532@cs.cmu.edu> Date: 22 Jul 92 01:51:06 GMT References: <tfiske.711742881@qualcom> Organization: School of Computer Science, Carnegie Mellon Lines: 19 Nntp-Posting-Host: b.gp.cs.cmu.edu