EVERYTHING mac related cost a fortune back then, and people did upgrade old machines even when it was only marginally cheaper than buying a whole new one. A lot of those CPU upgrade cards were pushing up on $1500 throughout the 68K era.
I always thought it was funny when people scrape the numbers off ICs in attempt to hamper reverse engineering. With standard TTL parts which those almost certainly are, any semi-competent engineer armed with a logic probe and a TTL databook can usually figure out what they are in a few minutes. I wonder what sort of monitor that supported though? Was there a composite video format that shared the Mac scan rates?
I always thought it was funny when people scrape the numbers off ICs in attempt to hamper reverse engineering. With standard TTL parts which those almost certainly are, any semi-competent engineer armed with a logic probe and a TTL databook can usually figure out what they are in a few minutes. I wonder what sort of monitor that supported though? Was there a composite video format that shared the Mac scan rates?