please where is possible to find or who has got firmware to spectrum analyzer HP 8591A (old version) ? I need U6 U7 U23 U24 and there are 27C512 eprom s. Labeled is 08590-80154 900103 (1990 year).or another version about 1990-91? In this older type of CPU board is not possible to install 27C010 eproms with newer firmware (PAL array with different program hence the boards seems to be identical). So importants is that must be in EPROMs 27C512 , AMD type 1818-3448 ..
The CPU board where these memories are installed calls 08590-60102 .
If somebody needs I have FW to HP 8591E version 8590_80230 (4x eprom 27C010) from y. 1994 .
Thanks a lot!