Mz3500, 5^. fdc (upd765) – Sharp MZ-3500 User Manual
Page 52
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5^. FDC (UPD765)
UPD765 pin configuration (top view)
MZ3500
UPD765 block diagram
KLSt I 0~---►
RDO——►
WHO——►
CSO—
AOO—
DBO
I NDEXO-------- ►
I NTCV«------
)fO-
GNDO-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
—O Vcc
-►ORW/SEEK
-►O LCT/Dl R
-►O FLTR/STEP
->0 HOLD
—O READY
■O WPRT/2S1DE
FLT/TRKO
♦O
WDATA
-►O USO
-►O USl
-*0
SYNC
—O RDATA
*------ O WINDOW
—O WCLK
- kf AH'»
* 1 K T 2 ' ' 1 D F
- 1 S D F X
- n T T k K O
•^Efch
►
H ' X D
►
S { D F
►
L C T I ) J R
► F L T K S T E P
RESET ; Reset
MFM
RD : Read
SIDE
WR ; Write
USO, 1
CS ; Chip Select
WDATA
AO : AO
PSO, 1
DBO • 7 ; Data Bus
FLT
DRQ : DMA Request
TRKO
DACK : DMA Acknowledge
WPRT
TC : Terminal Count
2 SIDE
INDEX : Index
READY
INT : Interrupt Request
HDLD
0 : Clock
FLTR
GND : Ground
STEP
WCLK ; Write Clock
LCT
WINDOW : Data Window
DIR
RDATA : Read Data
RW/SEEK
SYNC : VFO Synchronize
WE : Write Enable
: MFM Mode
; Side Select
: Unit Select
: Write Data
: Pre Shift
; Fault
: Track 0
; Write Protected
: Two Side
; Ready
: Head Load
; Fault Reset
: Step
: Low Current
: Direction
: Read Write/Seek
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