Help Identifying RAM Chips

Correct, the number 1 is 64k and I bet that is for video use i think because: I have old machines like this designs usually uses big 24 dip static memory or dynamic 64k in 4 bits form maybe. 300 Could be static memory more likely than dynamic type which might be 8k x 8bit in a 24 or 26 pin fat package and mostly likely found in video section. Oh yeah, I'm very sure that was normal configuration for that CGA video type for that time in 1983's, that should have 2 of them to make 16k. Other last 3 chips, they're all 256k x 1bit at 150ns. Note! Change all 9 chips in a bank to keep reliablity which you might have experienced having problems suppose if you had just did one chip... 150ns could be 8mhz because 4.77mhz takes exactly 210ns per instruction in 8088 so IBM used 200ns chips. Oh, Tim, I would be surprised if military accidently released 15ns in early 1980's Oh no! :) NOT! The fastest current drams of any kind was 45ns and mostly used in video cards for no reason where 60ns would do well...static chips did not hit 30ns mark for nearly 7 years later, I think. Troll the hardware guy. Big nip to save bandwidth... Yes right, Tim.