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-
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—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 KT 2'' 1 DF
- 1 SDF X
-n T TkKO
•^Efch
H'X D
S { DF
LCT I)J R
►FLTK STEP
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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