On Sat, 10 Oct 2009 04:15:59 +0800 W B Hacker <w...@conducive.org> wrote:
> > The only 'glue' needed was level-shifters - discrete transistors on my OSI > Challenger II, Motorola 1488 & 1489 diode-coupled-logic on everything up > until > the 16XXX derivative of the 8250 was sucked into a 'bridge' chipset. > I remember being quite surprised by the first UARTs which had level shifters on the chip, and they came out around 1993 or so didn't they? As far as I know it was hardly possible to handle RS-232's 25V signals on the same die as logic functions back in the 80s. > PCDOS was lousy at I/O, and Windows no better. Linux either. Makes me sad. ;-J -- Ethan Grammatikidis Those who are slower at parsing information must necessarily be faster at problem-solving.
