Visual/Sound Register (2Dl) - IBM 3278 Technical Reference

Visual/Sound Register
(2Dl)
This 8-bit register is set and reset by the emulation adapter
except for the sound alarm (bit 6) which is reset by any Write
operation from the IBM Personal Computer to this register
with any data. No other bits are affected by a Write operation
I
from the IBM Personal Computer to this address. Each time this
register is loaded by the adapter logic, bit 2 in the Interrupt/Status
Register is set.
Frame
Bit Function Bit
0 0= 80 characters per line 3
1
Inhibit Feature Step of Address Counter 5
2 Inhibit Display 6
3
Inhibit Cursor
7
4
Reverse Cursor 8
5 Blink Cursor 9
6
Sound Alarm
7 Enable CI icker
Visual/Sound Register
1-5