System Control Blocks

Byte 1
lOS Flogs I Model Code I
UCB + 16 (10) 17 (11)
Bytes and
Offset Alignment
16 (10) 1 Byte 1
17 (11) . 1 Byte 2
GRAPHICS DEVICES CLASS
2250 Display Unit
UCBTYP
Byte 2 Byte 3 Byte 4
Optional Features I Device Closs I Unit Type
Hex.
Dig.
J-
1-
3-
-K
-1
-2
-3
0-
1-
2-
3-
4-
5-
6-
7-
8-
9-
A­
B-
C-
D-
E-
F-
10 il,)\
IV \ ILl i9 (i3)
Field Description. contents, Meaning
Device class
1053,2260
2250
Model code
Model 1.
Model 2.
Model 3.
Optional Features
Model Optional Features
1,2,3
1,2,3
1,2
1,2
1,2,3
1,2,3
1,2
1,2
1,2
1,2
1,2
1,2
1,2
1,2
1,2
1,2
No optional features.
Programmed function keyboard only.
Light pen only.
Programmed function key board, and light pen.
Alphameric keyboard only.
Programmed function keyboard and alphameric
keyboard.
Alphameric keyboard and light pen.
Alphameric keyboard, light pen and programmed
function keyboard.
Absolute vector graphics only.
Absolute vector graphics and programmed
function keyboard.
Absolute vector graphics and light pen.
Absolute vector graphics, programmed function
keyboard and light pen.
Absolute vector graphics and alphameric
keyboard.
Absolute vector graphics, programmed function
keyboard and alphameric keyboard.
Absolute vector graphic, alphameric keyboard,
and light pen.
Absolute vector graphics, alphameric keyboard,
light pen and programmed function keyboard.
UCB 371