Sharp MZ-3500 Manual do Utilizador descarregar pdf (Página 28)

M7 3500

2) Read/write from Z 80 to VRAM

(1) Timing period for display and

V-RAM Read/write.

H • SYNC-

J~L

^>-'7 Range wh°ra RDC can draw.

Fly back perfod

BLNK-

(2) Timing that the Z-80 can read/write VRAM

The Z-80 can read/write VRAM when GDC FIFO

buffer is either empty or Full, and can be accessed by

refreshing during the display period. Number of

characters that can be read/write within one raster in

any mode.

3) Structure of character VRAM

(1) When read/write from GDC

#07FF

#0000

8bi t

(A)

(B)

2KX8

2KX4

ASC 1 I

Attribute

4 b I t

-D7 D8

----------

► Dll

(A)

(B)

-----------------------------------------------

---

ASC I K8bit) (

--------

----

----------------

- —

( I2bil ) )

no D1 D2 D3 D4 D5 D6 D7|d0

DI D2

■ Blink

Reverse (G)

. Vertical line IR)

. Horizontal line (B)

(2) During display

#07FF

#0000

(A)

(B)

2KX8

2KX4

12bi t

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 115 116

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Sharp MZ-3500 Manual do Utilizador Página 28

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