Vax 613 0S Instruction Manual Page 227

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The first glyph is the space character (20
16
), continuing through successive ASCII
characters to the tilde character (7E
16
); these are followed by the characters A0
16
through FF
16
in the DEC supplemental Character Set. There are glyphs for 95
ASCII characters and 96 DEC Supplemental characters in this table. Undefined
characters are imaged as an error character (a backwards question mark). If the
console device is a TURBOchannel option, it probably uses its own font. This is
out of the control of the firmware.
When it enters and exits console mode, system firmware must ensure that the
console window is displayed correctly.
16.1.3 Attached Terminals
When present, the special attached terminal connected to serial port number 3
must be operable at all times. The console support firmware does not attempt
to alter the state of these terminals or the serial port through which they are
connected. At entry to the console mode, firmware calls the operating system’s
SAVE routine, if supplied. At exit, the operating system’s RESTORE routine is
called, if supplied.
The firmware sends an XON character (11
16
) to the attached terminal at entry to
console mode, in an attempt to eliminate a hung line condition. These include for
the VT200 series: keyboard locked, executing device control string (for example,
ReGIS and SIXEL), Tektronix mode, local mode, set-up, and so on.
16.1.4 Built-In Terminals
If there is no attached terminal, the console firmware uses a console window on
the built-in display hardware, whether it is the smart frame buffer video on the
system board or an optional video. The state of this hardware must be modified
for the console to run.
The LK401 keyboard on serial port number 2 (SCC1 Channel A) and the serial
port characteristics must be operable without changes, so their state is not
altered, except for sending a resume_kbd_xmission command (8B
16
). The
firmware cannot control certain other situations in which the workstation
keyboard must be reset (possibly by cycling power), including:
LK401 test mode
Division six keys (Shift, Ctrl) not set to down/up
Any other division set to down/up
There is no guarantee of reasonable operation of keyboard autorepeat, LEDs,
bell, or keyclick; these features should work as specified, if the LK401 is in its
power-on default state.
Console 16–3
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