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Chuck(G)

  1. GoTek Floppy Emulator, Part III - Try to crack the nut, first try

    So what's in the firmware for this thing? I can guess, based on the operation--and having done one myself, but it'd be nice to get the firmware from the unit itself.

    So, there's that header near the power pins that I was talking about. I've identified the connections to the MCU USART and noted from that there's a serial boot utility that's present in the chip. All that's needed is a level converter for 3.3V logic to RS232C and a terminal emulator running on a PC (I really like ...

    Updated January 16th, 2013 at 11:37 PM by Chuck(G)

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  2. GoTek Floppy Emulator, Part II - Operation

    Okay, time to test this thing and see what's up.

    As mentioned earlier, this thing comes with a mini-CD--but don't expect much. You get English and Chinese versions of the somewhat cryptic manual and a couple of software programs in RAR archives.

    No installation routines; you have to figure that out all by yourself. No wonder they don't sell many of these.

    The format is fixed at 18 512-byte sectors per track on 80 tracks, with sectors numbered from 1 to ...
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  3. GoTek 1.44M 3.5" Floppy Emulator Tear-down

    On a whim, I picked up a GoTek 3.5" 1.44M floppy emulator from eBay for just under USD$29 shipped.

    It arrived in a padded mailing envelope with a "China Post" shipping label. Inside, inside of a plastic bag was a "mini" CD and the GoTek unit with a couple of mounting screws.

    Here's a top view of the GoTek next to a traditional (NEC) 3.5" 1.44M drive:

    Click image for larger version. 

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    Here's what the front looks ...
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  4. LCD's and Backlights?

    Quote Originally Posted by lyonadmiral View Post
    Hi Guys,
    I think I'm going to take a whack at replacing the inverter. It is only $5 bucks shipped so I think I'll do that first. The laptop isn't mission critical, so if I break it, it's okay.
    Be careful if the thing comes with a plug with wires attached--one of mine was shipped with a plug with red = ground and black = +12, so double-check the documentation before you solder!
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  5. PC-6300 and a Future Domain TMC-850M SCSI Controller, locking up the system

    There's probably a better place to put this post, but since it came up...

    I've located the booklet--actually about 20 pages (AT&T pub 999-300-3091S) that gives instructions for upgrading to the 1.43 BIOS. It came with 2 EPROMs and 1 PAL, identified as "PAL 90" and as a "memory decoder PAL". It replaces PAL49 at position 2P on the motherboard.

    There's some additional information regarding switches and disks in the booklet as well. In particular, ...
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