Need info for a rare 486 computer-in-a-keyboard

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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Karlsweldt » Mon Jan 30, 2017 7:04 am

If no separate power lead set to the floppy drive, the pinout would be proprietary. Some leads of the ribbon supply power to the drive! Floppy drives went out of favor about 10 years ago.. capacity, reliability problems.
Maybe some help here.. http://www.datasheetarchive.com/FLOPPY% ... sheet.html
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby evasive » Mon Jan 30, 2017 2:47 pm

Not DF, FD!

https://www.amazon.ca/NEC-Internal-1-44 ... B00JH7YG5C
even more crazy pricing:
http://www.ebay.com/itm/NEC-FD1138H-FD5 ... 1105514257
datasheet:
http://floppy.shugart.free.fr/docs/nec/fd1138h.pdf

jumper settings:
http://jope.fi/drives/necflopp.txt

pinout of the connector:
http://old.pinouts.ru/HD/26pin_microfloppy_pinout.shtml

DIY attempt at a converter cable to fit a 34pin floppy in there:
http://www.vogons.org/viewtopic.php?t=19074

This may be what you are looking for, if it's cheaper than those rare 26pin floppy drives.
http://www.martinruss.com/sy99adapter.html

More info:
http://www.cpcwiki.eu/index.php/DIY:Floppy_Drives

Oh BTW, what does your AMIBIOS boot screen show you?

Image

Interested in the line at the bottom of the screen for the ID.
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Jonas-fr » Tue Jan 31, 2017 6:19 am

Thanks for your answer, evasive: I already checked most of the link you posted except for the Vogons one, will test it in the following hours.

In the meantime here's the pictures you asked, the BIOS screen must be the funkiest one I've seen regarding its colorscheme. I'm kinda digging it since it seems full of options (more than I can remember on my other 486 computers).

The BIOS code (it reads: 30-0500-ZZ1453-00101111-070791-ACER1217-H), do you find something interesting reagrding it apart from its date? > EDIT: OK I deciphered it with a table I found on the web: it seems that's a 386CPU BIOS whereas the CPU marking of Texas Instrument shows a 486SL. Maybe the TI CPU is a pimped up 386?
http://imgur.com/fNwgyDW

The Bios menu with its funky colors : )
http://imgur.com/SCig7h5

PS: I'm not complaining but do you know if the messages posted here are always moderated before being visible? It slows the pace of the conversation IMO, but I understand why it is in place since it can prevent spammy posts > EDIT : Thanks Toby B. for the explaination/intervention!
Last edited by Jonas-fr on Tue Jan 31, 2017 9:13 am, edited 1 time in total.
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Toby B. » Tue Jan 31, 2017 8:34 am

PS: I'm not complaining but do you know if the messages posted here are always moderated before being visible? It slows the pace of the conversation IMO, but I understand why it is in place since it can prevent spammy posts.


An adjustment has been made to your account so you should be able to now post freely.

The moderation situation is necessary due to the unwillingness to properly maintain the forum software by the owners of the site leading to a spam fest if the moderation limit is not in effect..
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Karlsweldt » Tue Jan 31, 2017 9:26 am

That BIOS code you noted, [30-0500-ZZ1453-00101111-070791-ACER1217-H], shows a conception date of July 07 1991. Then the "Acer" brand.
Not unusual to see those 'funky' colors with older BIOS images. Just a bit of 'bling'. Some had a choice of color schemes. Most of the older BIOS versions (early 486 and older) did not have an auto-detect for the hard drive, so manual choice of what was listed, or 'user-input' was mandatory. If the hard drive specs were not within the BIOS limits, you might be able to fool the BIOS check by doing a 4x head count and 1/4 cylinder count. But the SPT (sectors per track) cannot be changed. There also may be a choice of 'standard' or "LBA" (logical block addressing) for specs.
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Jonas-fr » Tue Jan 31, 2017 9:29 am

Ok cheers for the info. I'm going to try to guess the pinout of the FDD. I hope I won't fry anything!
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby evasive » Tue Jan 31, 2017 11:25 am

ACER1217 -> ALI (Acer Labes Incoporated) chipset (M1217 to be precise)

ZZ1453 -> OEM variant of 001453 -> Jamicon indeed

core bios date is from 1991, the actual bios might be a bit less ancient.

the 386/486 confusion about the 486SLC is normal, it is a mixture originally from Cyrix:
https://en.wikipedia.org/wiki/Cyrix_Cx486SLC

I gave you the pinout of the FDD and more than one conversion table to 34 pins. I suspect there's more projects out there to connect a 34pin floppy to a 26pin controller, just take your pick on which one seems feasable to build yourself.
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Re: Need info for a rare 486 computer-in-a-keyboard

Postby Jonas-fr » Wed Feb 01, 2017 1:38 am

evasive wrote:I gave you the pinout of the FDD and more than one conversion table to 34 pins. I suspect there's more projects out there to connect a 34pin floppy to a 26pin controller, just take your pick on which one seems feasable to build yourself.


Yes I saw, sorry my post was written as if I would try a random pinout. I'll try the pinout you provided via the VOGONS link and let you know! Cheers!
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