DISK II emulator for APPLE II from Nishido.
He is close site with english translation because many people copy gerber and schematic and sell this board. But japanise version still available.
Connector description
top with marker here
1 3 5 7 09 11 13 15 17 19
2 4 6 8 10 12 14 16 18 20
1:GND
2:STEP0
4:STEP1
6:STEP2
8:STEP3
10:WRITE REQUEST'
12:+5V
14:DRIVE ENABLE'
16:READ PULSE
18:WRITE SIGNAL
20:WRITE PROTECT
others:NC
Links
tulip-house Nishido site.
Vintage computer forum about apple I/II
Gerber files of this board
Archive with firmware, schematic and disks
Photos
my sdisk card