Free for the cost of shiping : Altos CPM and MiocroSoft COBOL 8"disc's

On Thu, Oct 13, 2011 at 9:53 PM, Chuck Guzis <cclist at sydex.com> wrote: Any idea of the 128-byte MFM sector capabiltiy was carried forward into the National Semi PC87306 SuperI/O? The system that I setup for using ImageDisk uses that chip. Ok, after a couple of minutes of searching on the web I found my own answer. The Registry found here lists two motherboards with PC87306 which both list 128-byte sector support: http://www.classiccmp.org/dunfield/img/index.htm The 'X' test (Double-Density with 128 bytes sectors) checks a capability that is used by very few disk formats, and for most people, not having it will not be a significant drawback. (Which is good, because the original NEC-765 PC controller, and most later chips based on this design don't support it). --------------------- Mainboard / Controller Listings ----------------------- S = Single Density P = Passed D = Double Density F = Failed X = Double Density / 128 byte sectors N = Not tested Data rate 250 300 500 Manufacturer Model FDC chip Class SDX SDX SDX ----------------------------------------------------------------------------- IBM 658695T PC87306 P1 PPP PPP PPP QDI P51430VX-250 ExplorerII NS PC87306 P1 PPP PPP PPP