[TUHS] Of /dev/tty8
Larry McVoy
lm at mcvoy.com
Tue Mar 19 01:20:44 AEST 2024
On Mon, Mar 18, 2024 at 10:58:04AM -0400, Paul Winalski wrote:
> On Mon, Mar 18, 2024 at 9:57???AM Clem Cole <clemc at ccc.com> wrote:
>
> > The DZ11 is an eight-port mux (with short pinned modem control and no DMA
> > - both causing issues).
> >
>
> I'm pretty sure that when we beta tested the VAX-11/780 in the summer of
> 1977 it had a DZ11. We only had a few LA36 printing terminals on it so we
> never saw any issues with it. Not so when I started work at DEC in 1980.
> The VAX-11/780 I worked on had IIRC three DZ11a supporting 24 terminals.
> The lack of DMA was a big issue. We had to run our VT52s no faster than
> 300 baud or it brought the system to its knees.
I was one of about 40 students working on a terminal hooked to a 780.
I put up with it for a semester and then bought a 4mhz 128KB Z80
CPM machine. It was not that fast but it was all mine. I was more
productive on the Z80.
I got a $2000 loan to buy it. Taught me that I really really hated to
owe the bank.
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