CP-M Z80 home brew computer circuit board - test-drb@ccmp.vtda.org

15 Jun 2008

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Subject: Re: CP-M Z80 home brew computer circuit board
   From: "Roy J. Tellason" <rtellason at verizon.net>
   Date: Sun, 15 Jun 2008 17:22:48 -0400
     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>

On Sunday 15 June 2008 16:43, Chuck Guzis wrote:
  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 thought it was the 179x parts that had the data separator on-chip,  no? 
No.  1770 did as did 2793...

Allison

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