Another recent addition to my growing collection is, as the title
suggests, an IBM 5285. It has a 12" display and dual 8" floppy drives.
The separate keyboard is connected at the front of the machine by a
large 25 pin connector.
Originally passed to me as "working" the machine fired up to display
what looked like a single ASCII code at the top centre of the screen
and a column of blocks on the far right. The keyboard is laid out very
much like a terminal keyboard and testing the keys the keyboard buffer
quickly becomes full. This results in what looks like a series of
memory addresses along the bottom of the screen.
All the while the two 8" drives are merrily spinning away. I have one
disk with the machine which when inserted in either drive fails to read
or alter the state of the display.
My initial thoughts were faulty connections. I took the covers off to
reveal about a kilo of dust liberally spread around the inside. I
cleaned each component carefully and replaced the boards. Now I don't
get anything on the display and the drives still whirr around oblivious
of disk or no disk...
So... my questions are:
1. Has anyone come across this model before and is it a dumb terminal?
2. What checks would you suggest to solve the disk access problems?
3. Can anyone point me towards a repository of information about it?
Thanks in advance