Cuttoon wrote on 2022-03-15, 17:51:
Still not quite sure what TTL means, but e.g. I worked for some months at the university at Sun UltraSparc workstations. Those hade very impressive fixed frequency CRTs utterly alien to the PC world.
Hi! It means Transistor-Transistor-Logik. Before TTL, there was Diode-Diode-Logik etc.
When TTL became popular, it did set a standard for voltage levels that were corresponding to logic states : +5v and 0v. For logic states 1 and 0. Or vice versa.
The 7400 series of ICs also uses TTL.
After TTL, a new star was born: CMOS.
It used lower voltages by default, but many modern ICs are compatible to TTL lebels still.
Like the 74HC00 series.
- The CMOS counterpart to the 7400 series was the 4000 series, but it is discontinued.
TTL monitors were thus monitors that used *digital signals on their video connector or internally (full on, full off).
MDA (Hercules) and CGA monitors belong into this category.
But some PCs, like the Commodore PET had internal monitors that filtered out grayscale information.
The Atari ST monochrome monitor also used TTL-like signals.
(*digital in the sense of "fingered" -> like a comb, pre-defined. Digital can be binary, but it's not limited to it)
https://en.wikipedia.org/wiki/List_of_4000-se … grated_circuits
Edit: Edited.
Jo22 wrote on 2022-03-15, 17:29:But that was here in good ol' Germany.
Never change a running system. The network infrastructure has become a bit of a running […]
Show full quote
But that was here in good ol' Germany.
Never change a running system. The network infrastructure has become a bit of a running gag, but ISDN was a simple case of "victory desease" - it was really good for its time and a telephone line.
They developed it in the 70s, being at the very forefront of digitalization, then equipped the whole former GDR with what was then the world's most advanced telephone system.
Other places went from POTS directly to DSL.
I was glad to use ISDN from 1998 to 2001. Good ping times.
Ah yes, true. ISDN was also compatible to Datex-P, a classic X.25 network tevhnology.
From what I remember, making BTX (Datex-J) available in ex-GDR was a huge undertaking after 1990. 😬
chinny22 wrote on 2022-03-16, 11:13:
Main drawback will be shipping, CRT's are a pain to pack safely, but if you put it up for free or next o nothing on Facebook Market place or whatever I'm sure someone will grab it.
+1
Gratefully, monochrome monitors like this are very lightweight by comparison.
They may survive a transport, if the packet is well padded.
An ordinary VGA monitor is tricky to ship, though. 😨
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
//My video channel//