CM 7202

Parts of this topic may be machine translated.

(see in another language - Deutsch, Polski, Русский)

These are three independent terminals, plagiarism of the Dec terminals.

The first device developed within the SMEP program in the VVL Žilina program was an alphabetical-number Video Totermal CM 7202. It allowed the display of the display and/no information in the raster of 24 lines of 80 characters per line, equipped with an alphanumeric and function keyboard and allowed to connect to the Minoicable SMEP respectively. Other digital devices through local IRPR interface or distance interface IRPS, respectively. Modem Citt v.24.

Cm 7202

No processor (logic only), IRPR interface (up to 150 kbyte / s) and IRPS (speeds of 100,200,300,600,1200,2400,4800,9600 bps), 80x24, UART MHB1012 (IRPS), MHB2501 / MHB 2502, monitor AZJ 462.

It could be a modified design DEC VT05 or a similar terminal.

boards

List of control commands

7 ^g bell Bell releases an audible tone on the electronic speaker
8 ^h bs c ← moves the cursor by one place to the left.
9 ^i ht tab horizontal card. Moves the cursor forward to the next tab stop. The stops are fixed on every eight characters.
10 ^j lf lf line shift. Moves the cursor one line down. If it is on the last line, move the contents of the screen one line up.
11 ^k c ↓ moves the cursor one line down.
13 ^m cr
14 ^n so CAD direct addressing of the cursor. Moves the cursor to the row and the column designed by the following characters, 31+Y and then 31+X (the top row and columns are completely left.
24 ^x CAN C → Moves the cursor by one place to the right.
26 ^z sub c ↑ moves the cursor by one line up.
29 ^] GS HOME Move the cursor to the top row, the column completely left.
30 ^^ rs eol delete by the end of the line (including the character on the cursor). The cursor will remain in the current position.
31 ^_ us eos deletes the end of the screen (ie he clears the characters at or after the cursor on the current line and all characters on the lines below the current line). The cursor will remain in the current position.

Cm 7202 m.1

The innovated videooterminal cm 7202 m.1 was designed to connect the operator to the computer via the serial asynchronous transmission channel IRPS or CCITT V.24. The terminal was controlled by its own eight -bit microprocessor MHB8080A and was built into the original Video Totermal cabinet cm 7202.

Supplied in three modifications:

It could be a copy of the DEC VT100 or a similar terminal.

Description of the logical part of the terminal

(With GM 7202.M1 charts)

Terminal cm 7202.m1 From a functional point of view, you can divide into three parts:

- Bidirectionally communicates with a higher computer over 20 mA of the current line or via modem (or modem level)

- communicates with the keyboard respectively. by printer through its parallel interface circuits at the TTL level

- For the alphanumeric part, it generates the base Classic clock HB (13,824 MHz) and the highest transfer rate of 9,600 BD

- controls the operation of the system bus to which the alphanumeric and chart is connected

- analyzes the codes received or already from a computer or from the keyboard and sets individual modes of terminal activity, or performs the command, or sends the code received via the system bus to the alphanumeric or graph part/according to the set up mode/mode/

- analyzes the terminal status when it is switched on to the net, ie, or is in local or remote mode, or the terminal is a graph or just alphanumeric, or or is a connected printer and automatically reports the result to a higher computer.

The detailed description of the individual blocks of the 50/40 microcomputer, including their interconnection, is given in the technical description of the SM 2138-X board.

Cm 7202 m.2

CM 7202 m.2 was designed to connect the operator to the computer via serial asynchronous transmission channel IRPS or CCITT v.24 and also produced in three modifications:

System properties CM7202.M2 and

Plates of printed joints cm 7202 m.2 and

connectors CM7202 M.2 and

ROM

addressing MHB8080A

Memory:

0x0000 ROM B6
0x2000 Sram characters / MHB2114
0x3000 SRAM attributes / MHB2114
0x4000 ROM B7
0x7000 Backup Memory CMOS / Equipment Parameters / MHB5902 / 4
0x8000 16KIB DRAM Operational memory for SM9170B (8x MHB4116)
0xC000 ROM ??

I/O Ports:

Address Reading Write
88;
98 a data word of the keyboard port the keyboard port of the keyboard port
99 the status word of the keyboard port the command word of the keyboard port
A8 the data word of the communication port the data word of the communication port
A9 the status word of the communication port the command word of the communication port
B8 data word port port data port of print port
B9 the status word of the print port the command port of the print port
C8 filling the counter 0
C9 filling counter 1
Ca Filling counter 2
CB Timer's operation mode
D8
E8 Timing
F8 Controller

References

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