Sharp MZ-3500 User Manual download pdf (Page 57)

2) VFO circuit configuration

MZ3500

The VFO circuit has the following capabilities.

(1) Two modes; MFM and FM.

(2) The VFO circuit operation is suspended during the

SYNC field located before the ID field and data field.

(3) After suspention, the VFO circuit will synchronize

with the read data (timing is affected by a speed

change in the FDD). Fluctuations in an individual bit

that may be seen (peak shift are ignored.

VFO circuit

+5V RtAD DATA

- 62

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 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 User Manual Page 57

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