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Sharp Pc-7xxx internal hard drive

nodevice.com has the serivce manual for the 7200; it's a pay site (you pay about 8 euro for 24 hour access, but you get all the downloads you can manage in that time).

It might be worth having if you don't already have it.
 
Thanks for the info, i'll be sure to go there and get the manual.

Sadly i have no info on the expansion card the hard drive come on, i have a thread running in the PC compatible section, with some photo's. One thing i do know, is the connected on this expansion card is a row of pins, like on a modern IDE hard drive. Because the connector on the board is a socket, similar to a an ide cable connector.

Thats all i know at the moment. I'm totally stumbling in the dark, wondering if some sort of ISA ide expansion card wouldn't be an option.
 
OK, i now own a copy of the manual! Thanks to Chuck(G)!

I will quote you what is says about the hard drive, this is apparently unique to the 7200, which i have.

"This controller is and IBM PC AT controller (for JVC drive) that consists of an NDC864 host interface, NDC870 Hard disk controller , NCL2000 RLL modem, NCL2002 ECC, and z-80 micro processor."
 
an esdi drive wouldn't work would it?

hdd_ibm_wd-325n.jpg
 
I dont know, how does this board connect to the motherboard? The connector on the board of the machine, resembles a female IDE connector. Which makes me think some sort of board, attaches on to the mobo with a row of pins.

Many thanks
 
Sounds to me as if this takes a plain old MFM drive. Yes, there were MFM drives made in 3.5" form factor, but they are fairly rare, outside of a few "hard card" units and their failure rate was significant.

I don't know if anyone still has one floating around anywhere.

It might be possible to adapt that IBM PS/2-30 drive, as those were MFM (even though they're referred to as "ESDI").

http://www.ibmmuseum.com/ohlandl/misc/IBM_IDE.html#IBM_XT_IDE
 
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1ajs said:
an esdi drive wouldn't work would it?

hdd_ibm_wd-325n.jpg
Click to expand...

Heh...that looks familiar...wonder why...

That's an IBM 'DBA ESDI' drive, not 'ESDI', and needs to go in a system with MCA.

Chuck, pretty sure those are entirely proprietary drives (in the Model 30). Interface-with-able, I'm sure, but not through any existing means besides those PS/2s with the same interface built in.
 
Hi guys

This is the 7200's on board HD connector, least i believe it is, because on the reverse side of the board it says HD where the pins are :-D


imag0281l.jpg
 
Haemogoblin said:
Hi guys

This is the 7200's on board HD connector, least i believe it is, because on the reverse side of the board it says HD where the pins are :-D
Click to expand...

Yeah, well, that would be a pretty good indication and, if I had to guess how this worked, I'd say there was a IDE controller card that plugged into that header and the the drive cable would attach to a male 40 pin header on the card itself. It's the only setup that would make any sense.
 
Nope. The JVC drive is pretty old--it's the same hard drive used in some of the GridLites and in the Zenith SuperSport. Pinout is as follows:

Pin 1 GND
Pin 2 -Read Data
Pin 3 GND
Pin 4 -Write data
Pin 5 GND
Pin 6 Reserved
Pin 7 -Drive Select/+Power Save
Pin 8 -Ship Ready
Pin 9 GND
Pin 10 +Read/-Write control
Pin 11 -Motor On
Pin 12 Head Select(+Head 0/ - Head1)
Pin 13 -Direction In
Pin 14 -Step
Pin 15 -Write Fault
Pin 16 -Seek Complete
Pin 17 -Servo Gate
Pin 18 -Index
Pin 19 -Track 0
Pin 20 -Drive Ready
Pin 21 GND
Pin 22 +5V
Pin 23 GND
Pin 24 +5V
Pin 25 GND
Pin 26 +12V

ZDSParts.com has one for $68.

(It's basically an RLL drive)
 
If this JVC drive is anything like the MFM ones they put in the early Toshiba "laptops" (eg JD-3812MOTO), and it does look like it, then it might not be worth replacing because the replacement will likely fail soon. The platter coating was faulty and would break down over time, whether it was used or not.
 
Thanks guys, as i couldn't find a suitable replacement at an affordable price, i've decided to use the machines only ISA port, to hook up an IDE hard drive. I was hoping to save the port for a network card, but that's not going to be possible. Bit of a downer, but unless they make isa IDE / Lan cards i'm a bit stuffed lol
 
Ole Juul said:
If this JVC drive is anything like the MFM ones they put in the early Toshiba "laptops" (eg JD-3812MOTO), and it does look like it, then it might not be worth replacing because the replacement will likely fail soon. The platter coating was faulty and would break down over time, whether it was used or not.
Click to expand...

I still wonder if a PS/2 mod 25 or 30 "ESDI" (not) drive could be fitted with a cable adapter and used. Those are a bit more reliable.

I used to have a Gridlite, but it had the 20MB Prairietek drive in it. It ran fine for 20 years for me and was still running when I sold the machine.
 
Chuck: the 25 and 30 do not use the IBM "ESDI". I forget which models do, but the 25 and 30 have something much more proprietary (looks the same at first glance, still an edge connector on the drive, but fewer conductors)

The drive someone posted above whose picture is stored on my server (as I have that drive and it is for sale) is the MCA-based 'DBA ESDI' that you speak of. I got it for my Model 30 286 before I became aware that IBM did something different with the 25 and 30.
 
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