HP 86221 (DIP28) in HP85B computer

J

Jerzy Hoffmann

Guest
We have the computer HP85B and we have problem to know how its work.
Inside is tape storage system, within there is a chip named as:
1MA6-0001
86221
Package for it is DIP28

The 86221 is probably Hewlett Packard mark and is its own number for common
chip.
Can you help me to obtain a pinout for it or service manual for HP85B?
Maybe someone know for replacement for that chip with other classic one?
I will be grateful for it.
Regards,
Jerzy Hoffmann
 

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