30 Oct
2015
30 Oct
'15
11:40 p.m.
On 2015-Oct-29, at 10:22 AM, Jon Elson wrote:
Very neat, too bad the memory is gone.
Is building a new memory with modern stuff a consideration (enough documentation .. )?
- Another
topic: what is a Honeywell Alert machine? Searches are just bringing up some current-day
"Honeywell Instant Alert" messaging system.
It was a 24-bit DTL machine
designed for the X-15 project, and then used in a number of other projects. It is about
25 Lbs (without memory), draws 25 A at 5 V, and runs off a 3 MHz clock. It is constructed
of 6 multilayer PC boards with ceramic flat packs on both sides. The boards are attached
to a motherboard with flexible PCB, so there are no connectors inside the machine. They
chose this for reliability, it makes it REALLY hard to work on. There are cold plates
between the boards that conduct heat down to the baseplate. The instruction set was
apparently modeled after some Honeywell business machine of the time. It has no floating
point hardware, but DOES have hardware multiply and divide.
I have gotten it to run, sort of. Since I have no memory for it, I can jam op codes into
the data in plug and observe the speed at which the memory address ripples.