>BTW: very offtopic question: does any by any chance have a good (i mean
>GOOD) description of parallel ports ?? By this i don't mean bit assignment -
>i mean voltage levels (TTL ?), max. current (load) on pins, max. propagation
>etc. I'm asking because i don't have PCI LPT controller and i need 3 LPT port
>s
>in one box. So the only solution is to make a dual LPT controller (i have one
>
>ISA slot avaliable) and since ISA is very simple i thought that 3 74LS245 per
>
>port (3*8 lines, i will only use them in one direction, hardwired) with simp
>le
>address decoder should do (i don't have PAL programmer).
The original parport was based on discrete TTL chips. There might be a
description of the chips in this parport interfacing page:
http://www.senet.com.au/~cpeacock/
Yes, the voltage levels are TTL.
