Sharp MZ-3500 - Manual (Page 32)

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CH48
O' For 40 digit display
1 : For 80 digit display
There is a 40/80 digit switching signal I/O port
in the gate array of CSP1 and CSP2, but, the I/O
signal called CH48 is provided apart from the I/O
port.
08/16 — I/O port inside CSP1 and CSP2.
7) Graphic V RAM Address
Relation between VRAM address and screen (640 x 200 dors)
8-bit structure
Relation tretwepn VRAM address and screen
200
Uyte
0000 UOOI 0002 0003 UU )i
0050 0051
00\0
OOFO
3F30 31 7)
Graphic
address
map for
200 rasters
16-bit structure
Graphic
address
map for
400 rasters
CRTC block diagram
Color graphic VRAM PWB (option)
'iBK byte
(option I)
48K byte
(option tl)