Epson PC AX Technical Manual page 201

REV.A
DREN
DAKN
FDAN
BTC
FTC
FDRQ
DRQ
FWD
WB
PSI
PSü
WD
C48
TEST
MIN
OSC
CLK
WCLK
PINT
SYNC
VDRQ
SIDE
HS
INV
INVN
SEEK
DTKO
TRKO
o
I
o
I
o
I
o
I
I
I
I
o
I
I
o
o
o
o
I
I
o
I
o
I
o
I
I
o
60
12
50
13
42
40
61
35
36
33
34
28
55
38
48
57
54
56
41
43
53
51
22
20
21
37
31
39
DIAGRAMS AND REFERENCE MATERIALS
(-) Enable DMA and interrupt.
(-) D~~ acknowledge. (input frorn 8237)
(-) DMA acknowledge. (output to 765)
(+)
Terminal count. (input frorn 8237)
(+)
Terminal count. (output to 765)
(+)
D~~ request. (input from 765)
(+)
D}~
request. (output to 8237)
(+)
Write data. (input from 765)
(+)
Write enable. (input from 765)
Peak shift. (input from 765)
Peak shift. (input from 765)
(+) Write data. (output to FDD)
48 MHz clock input.
(-) Test pin.
Mini/Standard. (for SED9420)
16/9.6 MHz clock output. (for SED9420)
FDC dock. (8/4.8/4 ~rnz)
FDC write clock. (IM/600K/500K Hz)
(+)
Interrupt request of FDC. (input frorn 765)
VFO synchronize. (input frorn 765)
(+)
VFO DREQ. (for SED9420)
(+) Side select. (Head select, input frorn 765)
(+)
Head select. (output to FDD)
Input of inverter.
Output of inverter.
(+)
Seek. (input from 765)
(+)
Track O. (input from FDD)
(+)
Track O. (output to 765)
*
Legend:
I
=
Input P in
o
Output P in
7-27