durgadas311
Veteran Member
Not all logic boards are compatible with the case. The arrangement of ports on the back changed, so a different logic board might not fit. However, I believe Kaypro did not always ship the exact same hardware under the same label. But, I think it is just as likely that the version of software on the video was different than what you are running. Main board 81-240 is listed as being for the II/4(83). Note, the 4/83 and 4/84 are totally different main boards. Both are commonly referred to as "4". There is a technical document on bitsavers, "Kaypro Technical Manual 1484F", which shows the official part numbers used in various models.