The JVC JD-3824R00-1 harddisk

This is the internal hard disk of a Toshiba T-3100. It uses a custom interface, probably similar to the ST-506 harddisk interface, but fewer pins. Both signals and power are combined in one 26 header.

Other machines using this type of hard disk interface:

Epson PX-16
Epson Equity LT
Epson Portable PC (Q150A)
Sharp PC-7200
Data General One Model 2T ?
GRiDCase 3 Plus
Toshiba T1200 ?
Wang WLTC Laptop

In cage
3. Parameters (2 heads, 34 sectors, 615 cylinders) 4. 2-7 RLL coding 5. Spindle Rotation: 2597 rpm 6. Data Transfer: 7.5M bps 7. Average Access: 78ms 8. Power Voltage: 5V and 12V

Without cage A JVC JD3824R00-1. On the corners blue rubbery shock absorbers.
Controller This is the controller from the Toshiba T-3100. The chip numbers are: T7518 (large one), DC2090P166A (smaller one), TC57256AD-20 (EPROM). All are of the Toshiba brand.
Connector
Pin 1 GND (20- 2) Pin 2 -Read Data (20-18) Pin 3 GND (20- 4) Pin 4 -Write Data (20-14) Pin 5 GND (20- 6) Pin 6 Reserved Pin 7 -Drive Select/+Power Save (-) Pin 8 -Ship Ready (-) Pin 9 GND (20- 8) Pin 10 +Read/-Write control (34- 6) Pin 11 -Motor On (-) Pin 12 Head Select(+Head 0/ - Head1) (34-14) Pin 13 -Direction In (34-34) Pin 14 -Step (32-24) Pin 15 -Write Fault (34-12) Pin 16 -Seek Complete (34- 8) Pin 17 -Servo Gate (-) Pin 18 -Index (34-20) Pin 19 -Track 000 (34-10) Pin 20 -Drive Ready (34-22) Pin 21 GND (20-11) Pin 22 +5V (-) Pin 23 GND (20-12) Pin 24 +5V (-) Pin 25 GND (20-15) Pin 26 +12V (-)
The signals have the same name as the ST-412/ST-506 interface (between'()'), but the read/write signal is not differential.

Info on the 26-pin HD interface

Latest update: 2014-09-28

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In cage		3. Parameters (2 heads, 34 sectors, 615 cylinders) 4. 2-7 RLL coding 5. Spindle Rotation: 2597 rpm 6. Data Transfer: 7.5M bps 7. Average Access: 78ms 8. Power Voltage: 5V and 12V
Without cage		A JVC JD3824R00-1. On the corners blue rubbery shock absorbers.
Controller		This is the controller from the Toshiba T-3100. The chip numbers are: T7518 (large one), DC2090P166A (smaller one), TC57256AD-20 (EPROM). All are of the Toshiba brand.
Connector		Pin 1 GND (20- 2) Pin 2 -Read Data (20-18) Pin 3 GND (20- 4) Pin 4 -Write Data (20-14) Pin 5 GND (20- 6) Pin 6 Reserved Pin 7 -Drive Select/+Power Save (-) Pin 8 -Ship Ready (-) Pin 9 GND (20- 8) Pin 10 +Read/-Write control (34- 6) Pin 11 -Motor On (-) Pin 12 Head Select(+Head 0/ - Head1) (34-14) Pin 13 -Direction In (34-34) Pin 14 -Step (32-24) Pin 15 -Write Fault (34-12) Pin 16 -Seek Complete (34- 8) Pin 17 -Servo Gate (-) Pin 18 -Index (34-20) Pin 19 -Track 000 (34-10) Pin 20 -Drive Ready (34-22) Pin 21 GND (20-11) Pin 22 +5V (-) Pin 23 GND (20-12) Pin 24 +5V (-) Pin 25 GND (20-15) Pin 26 +12V (-) The signals have the same name as the ST-412/ST-506 interface (between'()'), but the read/write signal is not differential.