On 2020-03-23 17:58, Robert Armstrong wrote:
I think the 11/750 might have had an 8085 as well.
I'm pretty sure the 750's console functions were implemented in microcode. It was the only one
of the "big" VAXes that didn't have a separate "computer" as the front end.
Quotations used because the 730 wasn't all that big and an 8085 is not much of a computer.
You're probably right. Took a quick peek at some documents, and couldn't
find anything like a microprocessor in there.
Two other fun facts I know about the 11/750:
This was the only VAX for many years that actually used a boot block on
disks. All other VAXen had the FE provide VMB for the VAX, so that
booting was handled through VMB.
The memory bus on the VAX-11/750 is the same as for the MK11 box for the
PDP-11/70, and they shared some memory cards. However, the MK11 never
handled larger than 256K cards, while the VAX-11/750 was extended to
handle 1MB cards, and eventually even had a 4MB card that could be used.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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