20 Mar
2017
20 Mar
'17
6:10 p.m.
On Mar 20, 2017, at 8:46 PM, Win Heagy via cctech
<cctech at classiccmp.org> wrote:
Is there any reason why this chip would be removed? I see a number of them
on ebay for around $25. The expansion interface hardware manual indicates
it is an FD1771B-01, but the service manual indicates a couple
possibilities....FD1771 A/B -01 -11. Any considerations to look for here?
The EI may have had a double density board which plugs into the FDC chip socket. The FDC
chip then plugs into the doubler. Without the doubler you only have single density.
Original Percom or Tandy doublers are fairly rare to find today so someone may have pulled
it out to sell. Ian Mavric in Australia does make reproductions though.