http://margo.student.utwente.nl/el/
ports/pc

color     .zip      Pin Assignment for the IBM Color Graphics Adapter.
floppy    .zip      Floppy disc connection High Density (Shugart).
gameport  .zip      3 text files about using the gameport.
harddisk  .zip      RLL/MFM bus pin-out.
ibmcom    .zip      Summary on serial communication using the TTY protocol.
ibmkeybd  .zip      IBM keyboard info and FAQ.
ibmlpt    .zip      Interfacing the IBM PC Parallel Printer Port (FAQ's).
ibmports  .zip      Port Map of the IBM PC for external I/O using homebrew
                    plug in cards.
isabus    .zip      ISA bus pin-out.
joystick  .zip      Joystick interfaces and projests.
krislpt   .zip      PC Parallel Port Mini-FAQ.
mono      .zip      Pin Assignment for IBM Monochrome Interface.
par_port  .zip      Some C source codes for accessing the IBM LPT port.
para-prt  .htm      Info about the parallel port.
parallel  .zip      Pin Assignment for Parallel Port.
pci_faq   .zip      PCI bus FAQ.
pcipins   .zip      PCI bus pin-out.
pport094  .zip      Interfacing the IBM PC Parallel Printer Port.
pportbid  .zip      Parallel Ports - make them bi-directional.
pportexp  .zip      Provides 16 TTL-compatible i/o lines which are
                    programmable in 4 groups of 4 bits on the LPT port.
rs232gid  .zip      A Practical Guide to RS-232 Interfacing.
ser_adc   .zip      Serial Port A/D-converter.
ser_mous  .zip      Info about the serial protocol of mouses.
serial    .zip      Pin Assignment for the Serial Port (RS-232C).
serialpc  .zip      FAQ on serial communications using the TTY protocol.
uart_lib  .zip      Set of functions for use with your own code to make UART
                    programming (I/O to the serial ports) simpler.
utp_pc    .zip      Interface two UTP EtherNet equipped PC's.
utppins   .zip      UTP pin-out.
vga       .zip      VGA monitor pin-out.
win_com   .zip      MS-Windows COM and Ns16550A UART FAQ.

On the The Hardware Book pages (local mirror at WE-MAN!'s) there's really
a lot more info about all kinds of connectors, cables and adapters.

Also see the /stefan/el/pc/ad_da section for AD / DA convertors on the LPT port.
Looking for pinouts?

	Name	Last modified	Size	Description
	Parent Directory		-
	HEADER.html	07-Jul-1997 14:27	2.3K
	color.zip	02-Jul-1995 17:15	344
	floppy.zip	02-Jul-1995 17:13	538
	gameport.zip	23-Feb-1997 13:58	4.9K
	harddisk.zip	02-Jul-1995 17:14	537
	ibmcom.zip	28-Jun-1996 19:07	46K
	ibmkeybd.zip	23-Jul-1995 21:25	13K
	ibmlpt.zip	28-Jun-1996 19:19	20K
	ibmports.zip	02-Jul-1995 17:16	2.9K
	isabus.zip	02-Jul-1995 16:43	1.8K
	joystick.zip	19-Jul-1996 21:03	16K
	krislpt.zip	02-Jul-1995 17:15	3.9K
	mono.zip	02-Jul-1995 17:15	326
	par_port.zip	23-Sep-1995 15:45	2.4K
	para-prt.htm	31-Jul-1995 18:41	49K
	parallel.zip	02-Jul-1995 17:16	636
	pci_faq.zip	23-Sep-1995 14:46	5.9K
	pcipins.zip	02-Dec-1996 19:43	624
	pport094.zip	02-Jul-1995 17:12	17K
	pportbid.zip	02-Jul-1995 17:13	6.3K
	pportexp.zip	02-Jul-1995 17:13	2.8K
	rs232gid.zip	02-Jul-1995 17:17	7.7K
	ser_mous.zip	23-Jul-1995 21:11	1.2K
	serial.zip	02-Jul-1995 17:16	455
	serialpc.zip	02-Jul-1995 17:15	15K
	uart_lib.zip	21-Dec-1995 01:34	27K
	utp_pc.zip	02-Dec-1996 19:45	667
	utppins.zip	02-Jul-1995 17:16	807
	vga.zip	07-Oct-1995 20:22	947
	win_com.zip	23-Sep-1995 17:05	8.8K