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M Z 3500
4-10. Character VRAM select Circuit
GDC- 1
The signal BLNK is used to address the ASCII RAM
within address area of 0000-07FF in transfeiring
the display data from the VRAM to the CG.
Low when
0000^07FF
CS
61 l 6 ( 2 K x 8 )
ASCH
V-RAM
* 0 0 0 0
-03FF
2 1 1 4 ( 1 K * 4 )
First half of
= attribute
1 0 0 0 0
- 0 7 P F
BLNK: Erase signal
H-SYNC
TU
BLANK
Period that the GDC is enabied to read/write
and draw graphic data.
[Circuit description]
With respect to GCD1. the assignment during read/write
of the Character VIDEO-ROM is per the table below. The
Character VRAM Select Circuit is provided.to aecomplisb
this function.
L
AK11 =l.uw * 0 0 0 0
6 1 1 6 ; 2 K x 8 )
V -K. AM
Latter half of
attribute
First half
of attribute
t
AR10 = HI
t
AKIO = Low
*07FF
*0400
»03FK
»0000
8bu
4bit
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