Re: Write Signal on Disk II Question

On 11 Nov., 05:08, "Bryan Parkoff" <nos...@xxxxxxxxxx> wrote:
Do you know any special controller card without using logic state
sequencer ROM may be able to read all presence pulses and absence pulses
reliably? All presence pulsea and absence pulses can be written to the disk
reliably using special controller card. Do you know if it exists?

Bryan Parkoff

Hi!

Do you want to copy the disk to another disk or do you want to make an
image?
I don't know a controller CARD, but I can think of a trick with the
existing card, if you only want to copy to another disk:
Using a '74 one can reencode the signal read from disk and write it to
another disk at the same time. Then you only need to step over the
tracks while reading and you shold have a working copy (maybe you'll
need some circuitry to avoid writing during the seek).
If you only want to get an image for an emulator, you could try
connecting it to the IBM-PC's parallel port. I would connect the Read
data line to the Acknowledge line (remember it is inverted) and write
some DOS program to read the signal. IMO this should work but will be
a very difficult programming job.
Maybe I'll write such a program when I'm looking for a new challenge.
Mostly I do these things on an as-needed basis.

Ferdinand Meyer-Hermann

.

Relevant Pages

  • Re: Write Signal on Disk II Question
    ... I'd study the QAM modulation schemes often used in broadband ... write disk bytes to the disk using more than two adjusted zero bits ... Do you know any special controller card without using logic state ... All presence pulsea and absence pulses can be written to the disk ...
    (comp.sys.apple2)
  • Re: Write Signal on Disk II Question
    ... sequencer ROM may be able to read all presence pulses and absence pulses ... All presence pulsea and absence pulses can be written to the ... Do you want to copy the disk to another disk or do you want to make an ...
    (comp.sys.apple2)
  • Re: Fitting a SATA disk on pre-SATA motherboard
    ... If so, the controller card will need an onboard BIOS, which many have, and he ... I think that he will use it as a data disk. ... Presumably the controller card will come with a disk for the drivers. ...
    (uk.comp.homebuilt)
  • Re: Carte Blanche
    ... One vote here for a Disk II controller card. ... Much easier to hack than burning 6309's. ... Surprising... ...
    (comp.sys.apple2)
  • Re: What do you think, will connecting a ST-225 work (part 2)
    ... bit controller card. ... Hi level format the drive using FORMAT ... Running FDISK produces "Error Reading Fixed Disk". ... I believe the ST-225 is using BIOS in the controller card. ...
    (uk.comp.homebuilt)