home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.ti
- Path: sparky!uunet!gatech!psuvax1!ukma!netnews.louisville.edu!ulkyvx.louisville.edu!jhwhit01
- From: jhwhit01@ulkyvx.louisville.edu
- Subject: Re: HFDC
- Sender: news@netnews.louisville.edu (Netnews)
- Message-ID: <1993Jan21.100158.1@ulkyvx.louisville.edu>
- Date: Thu, 21 Jan 1993 14:01:58 GMT
- Lines: 36
- References: <2146@rztsun.rz.tu-harburg.de>
- Nntp-Posting-Host: ulkyvx02.louisville.edu
- Organization: University of Louisville
-
- In article <2146@rztsun.rz.tu-harburg.de>, ti6hk@ap04.rz.tu-harburg.de (Henry Koplien - 3358 ) writes:
- > I think we now reached the point of the most interesting stuff about the
- > HFDC! What are the differences between the versions of the HFDC??
- > Specially the bugs.
- >
- > I wasn't shure if the level 2 floppy-bug is hardware-dependent or
- > only software-dependent. Up to now I thought it is a failure of the pcb
- > coming nondeterministic, i.e. logic levels about 3 Volts sometimes less.
- > If it is a software-problem it should be solved.
- > Barry wrote H12. Tell us more about this version, if you can.
- > The other thing of interest, are there any changes of the pcb? This limits
- > upgrades by the software.
- >
- > To Barry Boone...
- >
- > I found the bug not only writing non-image files... The bug concerns
- > every write-format to floppydisk. I wrote a low-level debugging tool editing
- > sectors on floppy's and harddisks. Writing back the sector will sometimes
- > fail for the floppy. With a second try the sector is written! So it doesn't
- > matter which format you choose, every format is stripped down to a low-level
- > write.
- >
- > Henry
- >
- >
-
- Henry, you might want to make sure you have the SMC9216B (8-pin DIP) on your
- HFDC and not the SMC9216 used on several boards. The non-B version is only
- guaranteed to work at speeds up to 4.3 MHz, but the signal driving the chip is
- 8 MHz. The B-version is spec'd for up to 8.3 MHz.
-
- The 9216(B) is the data separator which is used only for reads (which are of
- course used during sector writes to put the data in the right area on the disk
- track).
-
- Jeff White jhwhit01@ulkyvx.bitnet
-