24 Dec
2004
24 Dec
'04
1:38 p.m.
Yes, the iPDS does use an 8272.
Here's the list of interesting chips on the base processor.
8085 CPU (2x)
8202 Dynamic RAM Controller
8251 Communication I/O
8253 Interval Timer
8255 Peripheral I/O (3x)
8272 Floppy Disk Controller
8275 CRT Controller
2716 EPROM (3x, not sure if all 3 are 2716)
8264 DRAM (8x, 64KB)
The main processor board (and it was one monolithic
system board with
cables to the keyboard, crt, and floppy drive. Besides the main cpu
with 64KB of ram, there was a second 8085 that implemented the keyboard
and crt terminal. So the main cpu only talked through an I/O port to
get "console in" and "console out". The main board also had an 8272
(I
think that was the chip) to control the floppy drive.