Called "Independent monitor", EC-7915 (or 7950) was a
complete terminal with Z80 CPU and firmware allowing to do basic things
in text buffer. It was made on Swedish licence - in Sweden it was known
as Stansaab Alfaskop. It was quite rough construction even in 1980s, as
Mera purchased licence in 1976 or 77. 7915 was expensive, but it used no
other circuits than simple logic and EPROMs. Later models had 8255
circuit to control keyboard, allowing to drop Keyboard Module. The
device used amber CRT, and was complete Z80 system working in modular
technology - module for CPU and data processing, module for text output,
in earliest models (I don't know if these were made outside Sweden)
module for keyboard handling.
These units were used with many computers, starting from Mera 60 RT system up to ComPAN 8 CP/M machine.
|Memory:||6kB (12x2114 chips)|
|Display:||Monochrome amber CRT|
|Keyboard:||Dedicated Hallotron keyboard.|
|Main port:||RS/232 serial|
|Additional ports:||Printer port
Internal: System bus expansion
Internal: CRT, LEDs and brightness/contrast trimmers (3 connectors)
Internal: Mainboard power (DB25)
Peripherals in collection:
|My unit comes from Cracow's
waterworks authority. It was used there probably with Mera 60
computer (see picture). As they dismantled the computer, they
removed back cover to disconnect keyboard - it's missing.
My unit isn't in good condition - as logic part works perfectly, the display is heavily damaged. Centering rings on CRT are shattered and some CRT circuitry is bad too. As I tried to diagnose it (I don't have a schematic) I figured out that there may be problems with CRT filament voltage or the CRT itself.
Mera-60 was a RT computer system for industrial measurements. It was
based on 8080 CPU, battery-backed RAM and had modular
construction allowing to install additional interfaces (digital,
such as DZM-180 printer interface, 1.8MB 8" floppy disk
controllers or digital measurement inputs, counters, static
inputs etc.), RAM, EPROMs, paper tape reader/puncher etc.
Later terminals had Czechoslovakian keyboard made by Konsul Zbrojovka Brno, which was similar to Alfaskop 3500's. Early units, shipped with Mera 60 or 80, had Polish one, enclosed in case similar to Meritum computer. First ones used Western German keyboards manufactured under American brand Micro Switch and used in some American terminals. Meritum took the casing from it.
After Elzab bought licence to manufacture these units, they became wide-spread across Eastern block countries. Similar units were made in Hungary, in Czechoslovakia (Tesla) and in Soviet Union.
(source: Mera catalogue)
(source: "1000 słów o komputerach i informatyce")
(source: Frigoscandia catalogue)
Picture on the right shows modular-type terminal used with Odra 1305. It's later one, with Zbrojovka keyboard. The printer-keyboard unit is probably D-180KSRE or similar. These "printing terminals" were used with Odra machines and other applications.
(source: Bajtek, 1986)
Source: IKS, 1986 - using mainframe with Mera terminals
Original Alfaskop units were used in Elwro for testing.
You can see them in film "Jak działa komputer" (How the computer works)
from 1970s. Here are some images from this film:
Alfaskop displaying OS/360 failure
Alfaskop dumping core after OS/360 crash at
Similar cases were used for comPAN 8 computer, it was produced in small quantity by PAN IT division.
Source: IKS, 1987 - probably comPAN 8 or similar unit in Mera modular casing. Photo from Komputer 87 computer show.
Source: IKS, 1986 - probably comPAN 8 or similar unit in Mera modular casing. Photo from Wilkasy '86 computer clubs meeting.
Internal power connector pinout:
View from mainboard solder side!
13,12,11,25,24,23 - +5V DC
http://se.services.fujitsu.com/veteran/bildarkiv_old/70307006.htm - picture of an original Alfaskop.
http://www.veteranklubbenalfa.se/veteran/03q1/030315.htm - I have NO IDEA what it is. It's in Swedish, I don't speak Swedish, but it looks like an article from one of original Alfaskop creators, who wrote his rememberings with computer industry.