Sharp MZ-3500 Manuale Utente Scaricare il pdf (Pagina 43)

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MZ3500

4-12. Read/write from the Z-80 to V RAM

Read/write of the Model 3500 V-RAM is done via the

UPD7220GDC. There are two methods used to read/write

data. The method (1) is used for the model 3500.

(1) Read/write via the 16 byte FIFO.

(2) Read/write of V-RAM in the DMA mode without

intervention of the FIFO.

¡Outline of the read/write data via the FIFO;

Set parameter for the command

Set parameter for the command.

\ Method used to give a command

to the GDC.

Command must be given to the GDC in the same manner.

On next page is the program of the above flowchart.

- 48 ■

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 115 116

SERVICE MANUAL 1
1. SPECIFICATIONS 2
Keyboard layout 3
1-3. MZ-1U02 3
1-4. MZ-IR03 4
1-6. MZ-1R06 5
1-7. MZ-1D07 6
2-1. SDO (INITIALIZE STATE) 8
MAIN CPU 8
M* )S V 1 M/} 9
MZS.'tOO 10
2.3. SD2 (ROM based BASIC) 11
Operational description 12
3. CPU AND MEMORY 13
L© 'MTR ! 14
3-3. Sub CPU and I/O port 15
1) Block diagram 16
‘ VK IN MEMCKT MM I Mf 20
4. CRT DISPLAY 22
X 25 lines screen.) 24
For Model 3200 senes 26
4-2. Video RAM 27
5) Synchronize signal timing 30
X : Y - 1 : 2 30
X : Y : 1 : 1 31
'iBK byte 32
(option I) 32
48K byte 32
(option tl) 32
M Z 3500 34
CSP 2 Block Diagram 37
20 GND IN 38
ASCII C.G. Structure 40
4 9. VSYNC 41
ARIO = HI 42
> FIFO Empty? 44
[Explanation] 45
Straight line drawing 46
Whereas 46
5. MFD INTERFACE 47
^ 0 ^ 0 1 49
8) Data write procedure 50
5^. FDC (UPD765) 52
UPD765 signal description 53
5-5. Data recording method 54
<ITE DATA 55
Write pulse [] fl d fl R 56
Polarity inversion 56
+5V RtAD DATA 57
M -- 3.1 58
©"T 58
Advanced 59
Does not trace i l^is 59
5-11. Media format 60
(Bbyles) 61
02 0\ FF FF 62
( 2KX 152 = 304K ) 63
Stop bit 64
6-4. System switch functions 65
6-5. 8251AC controls 65
2) Data output control 66
3) Data input control 67
7-D0C># 68
3iil>CPU of Ni^ 70
<i> 71
7 4. Data transfer timing 72
7-6. I/O port map 73
8. OTHER INTERFACES 74
-<3 ri> 75
MZ,"500 76
DIP SW(A) 79
1. BLOCK DIAGRAM 80
A. +5V and +12V supplies 80
M 7,3500 81
3. Alarm circuit 82
DESCRIPTION 83
10-2. Key search timing 84
JLJl_JlJT_ri_rLJl 85
Power ON 86
START (5mS) 86
11. SELF CHECK FUNCTIONS 87
CD SDO bank alternation error 88
11-2. Sub-CPU side 89
.8 test the 90
20 lines 90
/<.y ^ Jf -y > K W 91
8) ROM-IPL 92
S3Si-54Kl=-.*- • 93
12. IPL FLOW CHART 96
MAIN CPU IPL FLOW CHART 2/2 97
12 2. SUB CPU IPL FLOW CHART 98
■ I I Y Y TV 99
IjJliJlJjljJljJLllLljLLJ 99
LlJ LiJ LiJ Lei LiJ LLl LiJ 99
LJLeJ'LDliJLiJLLjLJLiJ 99
Pi co vO co fO Pi 100
Ч Г ^n UO 100
¿. ^ О 101
Û. CM Û 101
GUIDE LIST 102
I'l Exteriors 103
1 Exteriors 104
PWB & Fixing angles 105
[3 Connector 106
[4] Others 107
5 CPU PWB 107
5I CPU PWB 108
U Power supply unit 108
[6j Power supply unit 109
П MZ1R06 (RAM board) 111
SHARP CORPORATION 116
Industrial Instruments Group 116

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Sharp MZ-3500 Manuale Utente Pagina 43

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