Tektronix 4010 Maintenance Manual page 32

Characteristics-4010 Maintenance
TABLE 2-6
Gin Mode Specifications
Functions
Transmit Terminal Status and
With Alpha cursor displayed, the Terminal status, address of bottom-left corner
Alpha Cursor Position of Alpha cursor, CRt and EOT! are transmjtted to the computer in response to
ESC ENO from the computer. The Terminal automatically resets to full Alpha
Mode upon completion of sending the following bytes if CR is echoed by the
computer. Otherwise, the Terminal must be reset as explained under Echoplex
Suppression. Note that if CR is echoed, it resets the cursor to the left margin.
Byte
Item Bit7 Bit 6 Bits 5-1
1
Terminal Status
0 1 Status Bits
2 High bits of X address
0 1 5 MSB X
3
Low bits of X address
0 1
5 LSB X
4 High bits of Yaddress
0 1 5 MSB Y
5 Low bits of Yaddress
0 1
5 LSB Y
6
CRt
0 0 01101
7
EOT!
0 0 00100
Transmit Terminal Status and If ESC ENO is received while in Graph Mode, bytes 1 through 7 will be sent as
Graph Mode Beam Position explained above. Echoing of the bytes by the computer is not recommended
because echoing of bytes 1 through 5 will affect the content of the Y memory
latch, and echoing of CR will reset the Terminal to Alpha Mode.
Display Crosshair Cursor ESC SUB from the computer turns the crosshair cursor on. (ESC SUB should
not be entered at the keyboard.) This is a preparatory state for transmitting the
address of the crosshair intersect point. The Terminal can be reset to Alpha
Mode by ESC FF without causing it to transmit the crosshair intersect address.
The Terminal can also be reset to Alpha Mode by a PAGE or RESET command
entered at the keyboard, without transmitting the crosshair intersect address.
Transmit Crosshair Intersect Address
In Response to ESC ENO
With crosshair cursor displayed, ESC ENO from the computer causes trans-
mission of bytes 2 through 7 as previously listed. The Terminal automatically
returns to Alpha Mode upon completion of transmission if CR is echoed by the
computer. Otherwise, the Terminal must be reset as explained under Echoplex
Suppression. A 20 ms delay must exist between ESC SUB and ESC ENO.
I n Response to Keyboard
With crosshair cursor displayed, a keyboard character entry causes the Terminal
Character Entry
to transmit the keyboard character, and then to transmit bytes 2 through 7 as
previously listed. The Terminal automatically returns to Alpha Mode upon
completion of transmission if CR is echoed by the computer. Otherwise, the
Terminal must be reset as explained under Echoplex Suppression.
leR and EOT are optional, being dependent on straps on TC-2. EOT. or CR and EOT may be omitted. EOT cannot be sent without sending CR.
2-12
®