1.2.3 DISPLAY CONT
When video memory data (VRAM) [black/white display: 32KB x 1
(VRAM-B) and color display: 32KB x 3 (VRAM-B.G.R)]
Black/white or color display gives a full graphic presentation
of characters or figures. Display control too graphic display
controller (GDC) is yPD 7220D.
32KB x 1 or 32KB x 3 VRAM is
accessable on a time sharing basis either the GDC or the CPU
via the I/O bus.
Picture structure of both black/white and color display is as
shown in Fig. ].2.4.
(color display only)
i
--------------
1
)=80x8=&40 bit '
AN: 80 characters x 25 lines
Fig. 1.2.4
For black/white and color displays, a pallet display
system is employed and eight different patterns made from
1
or
3 VRAMs enhances display performance. Fig. 1.2.5 shows pallet
display system concept.
I
t--
R
I
0
1 2
...
*79
(bytl
640 dots
31920
1-10
Summary of Contents for AS-100M
Page 1: ...Canon FIELD SERVICE MANUAL ...
Page 26: ...2 2 5 FDD Media Canon specified MDD 512DD 512B sector 2 3 ...
Page 30: ...ICURRENT LÖÖPl Available soon 2 7 ...
Page 39: ...3 3 5 FDD 3 3 1 External View Housing plate Fig 3 3 1 Fig 3 3 2 3 5 ...
Page 41: ...3 4 8 FDD 3 4 1 External View Housing Fig 3 4 1 Fig 3 4 2 3 7 ...
Page 43: ...3 5 PRINTER Refer to PRINTER TECHNICAL GUIDE 3 9 ...
Page 47: ... 2 KEYBOARD 3 5 FDD 4 3 ...
Page 48: ... 8 FDD 4 4 ...
Page 100: ...8 FDD Fuse 1 Replace two 5A fuses 8 FDD as In Fig 5 5 7 5 23 ...
Page 107: ...Chapter 7 Troubleshooting 7 1 At System Up 7 1 ...
Page 129: ...Chapter 8 Appendix 8 1 Unit Configuration and General Wiring ...
Page 130: ...8 1 Unit Configurations and General Wiring 8 1 POWER SWITCH ...
Page 135: ...Fig 8 1 6 8 FDD For 115 120 230 240V POWER SWITCH ...
Page 136: ...CANON INC COPYRIGHT g 198 BY CANON INC Printed in Japan Feb 1983 E Y 8 6 0 7 2 2 2 2 ...