mdc@spt.entity.com (Marty Connor) (10/11/88)
...
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!mdcmguyott@mirror.TMC.COM (Marc Guyott) (10/12/88)
In article <186@spt.entity.com> mdc@spt.entity.com (Marty Connor) writes: > >... >Does anyone have or know where I can find a listing of the ports on an >IBM-PC? > The following is from "The Peter Norton Programmer's Guide to the IBM PC": Figure 2-9. The ports and port addresses used in the PCjr, the PC/XT, and the AT computers. Description Range PCjr PC/XT AT DMA Controller (8237) n/a 000-00F 000-01F Interrupt controller (8259) 020-027 020-021 020-03F Timer (8253;8254.2 in AT) 040-047 040-043 040-05F PPI (8255) 060-067 060-063 n/a Keyboard (8042) n/a n/a 060-06F DMA page register (74LS612) n/a 080-083 080-09F NMI mask register 0A0-0A7 0A 070-07F Interrupt controller 2 (8259) n/a n/a 0A0-0BF Sound generator (SN76496N) 0C0-0C7 n/a n/a DMA controller 2 (8237) n/a n/a 0C0-0DF Clear/reset math coprocessor n/a n/a 0F0-0F1 Math coprocessor n/a n/a 0F8-0FF Joystick (game controller) 200-207 200-20F 200-207 Expansion unit n/a 210-217 n/a Parallel printer (secondary) n/a n/a 278-27F Serial port (primary) 2F8-2FF 3F8-3FF 3F8-3FF Serial port (secondary) n/a 2F8-2FF 2F8-2FF Prototype card n/a 300-31F 300-31F Fixed disk n/a 320-32F 1F0-1F8 Parallel printer (primary) n/a 378-37F 378-37F SDLC (secondary BISYNC in AT only) n/a 380-38F 380-38F BISYNC (primary) n/a n/a 3A0-3AF Monochrome adapter/printer n/a 3B0-3BF 3B0-3BF Color/graphics adapter n/a 3D0-3DF 3D0-3DF Diskette controller 0F0-0FF 3F0-3F7 3F0-3F7 ---- ... I never saw the morning until I stayed up all night ... Tom Waits Marc Guyott mguyott@mirror.TMC.COM {mit-eddie, pyramid, harvard!wjh12, xait, datacube}!mirror!mguyott Mirror Systems Cambridge, MA 02140 617/661-0777