21 Aug
2005
21 Aug
'05
11:54 a.m.
>>>> "Tom" == Tom Watson
<sdc695 at yahoo.com> writes:
Tom> ard at p850ug1.demon.co.uk (Tony Duell) said:
> The earliest desktop comuter I know of with a
bit-banged serial
> port is the HP9830.
Tom> <<<deletia>>>
> I have never seen a bit-banged RS232 (or current
loop) port on a
> minicomputer. Anyone know of one?
Wasn't there a DEC multi-line interface that used a PDP-8 internally?
Or was used with a PDP-8???
A classmate of mine built a 4004 based PC from scratch, back in 1974.
It had a bitbanger interface, which made the boot loader rather
hairy. (Papertape was the only program load medium, apart from the
hex keypad.)
paul