"Michael A. Terrell" wrote in message
...
Meindert Sprang wrote:

Wrong, the 8279 is a programmable floppy controller which means it is a
floppy controller you can program to read different formats. It is
"programmed" by the code that executes on the 8085. There is no code
inside
the 8279.

Meindert


Sorry, Meindert, but you are wrong. According to the 1990 INTEL
Peripherals Databook the 8279/8279-5 is a Programmable Keyboard /
Display interface. The datasheet is dated Sept 1987 and is on pages
3-215 to 3-230

The 8272A is a Single / Double Density Floppy Disk Controller chip.
The data sheet is in the 1990 INTEL Peripherals Databook and is dated
Nov 1986. It is on pages 4-1 to 4-31. This was used on the original IBM
PC on their floppy disk controller card. The clones used the NEC
version because it was cheaper.

Oops! I mixed up some numbers here.....

But then again, is there really code inside the 8279? I vaguely remember
that the SDK-85 from Intel also had this chip and that programmable only
meant that you could set it up for a variety of keymatrices and display
configurations.

Meindert