15 Jun
2008
15 Jun
'08
4:43 p.m.
From: "Andrew Lynch"
Implementing floppy IO can take on many variations and
picking the FDC
is just the first of many challenges [FDC1793? NEC765? SMC9266?
WD2797?]. What about the data separator? Few chips remain and viable
sources are scarce. Even integrated FDCs with built in data separators
are not readily available.
The WD1770/1772/1773 is still my favorite "almost no external
circuitry" chip, but they're getting harder to find, in spite of
being used on Atari and Commodore boxes. You don't need to buffer
the floppy interface and the things have integrated data separators--
and come in a 28-pin package.
I wonder if it might be practical to implement an FDC in a uC or even
a CPLD.
Common sense might be to use an IDE-interface floppy, such as a
Superdrive (again, getting scarce) or implement a USB UHCI to
interface to USB floppies (still easy to find). I shudder to think
at the effort and space required to implement a USB stack in Z80
code, however.
Cheers,
Chuck
15 Jun
15 Jun
5:22 p.m.
On Sunday 15 June 2008 16:43, Chuck Guzis wrote:
From: "Andrew Lynch"
I thought it was the 179x parts that had the data separator on-chip, no?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Implementing floppy IO can take on many
variations and picking the FDC
is just the first of many challenges [FDC1793? NEC765? SMC9266?
WD2797?]. What about the data separator? Few chips remain and viable
sources are scarce. Even integrated FDCs with built in data separators
are not readily available.
The WD1770/1772/1773 is still my favorite "almost no external
circuitry" chip, but they're getting harder to find, in spite of
being used on Atari and Commodore boxes. You don't need to buffer
the floppy interface and the things have integrated data separators--
and come in a 28-pin package. 
6:09 p.m.
Whatever you guys do, Ill volunteer to do the layout.
Randy
Date: Sun, 15 Jun 2008 17:22:48 -0400
From: rtellason at verizon.net
To: cctalk at classiccmp.org
Subject: Re: CP-M Z80 home brew computer circuit board
On Sunday 15 June 2008 16:43, Chuck Guzis wrote:
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From: "Andrew Lynch"
I thought it was the 179x parts that had the data separator on-chip, no?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Implementing floppy IO can take on many
variations and picking the FDC
is just the first of many challenges [FDC1793? NEC765? SMC9266?
WD2797?]. What about the data separator? Few chips remain and viable
sources are scarce. Even integrated FDCs with built in data separators
are not readily available.
The WD1770/1772/1773 is still my favorite "almost no external
circuitry" chip, but they're getting harder to find, in spite of
being used on Atari and Commodore boxes. You don't need to buffer
the floppy interface and the things have integrated data separators--
and come in a 28-pin package.
5858
days inactive
5858
days old
2 comments
3 participants
participants (3)
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