Harris 6120

[pbirkel]

Looking for Harris 6120 CPU (12-bit processor, PDP-8 instruction set). It seems to have become hard to come by :-<. I "cut my teeth" on a PDP-8/L and would like to rejuvenate my old memories with a little construction project ...

Hints for a source of these beasties will be greatly appreciated even if you don't have one to part with yourself.

Thank you.

[isa-d]

I bought one for my collection in China on Taobao
http://item.taobao.com/item.htm?id=9681278303&cm_cat=0
but it's a ceramic military version
for your project i thinking a more common 6100 can be works

[pbirkel]

[quote="isa-d"]I bought one for my collection in China on Taobao
http://item.taobao.com/item.htm?id=9681278303&cm_cat=0
but it's a ceramic military version
for your project i thinking a more common 6100 can be works[/quote]

THX - Very interesting! How does one get that page in English (no luck yet; I'd even settle for Italian :->) and who is the manufacturer "HD1"? (Is that the key for Harris and MIL-grade?)

I do want the 6120 rather than the 6100 chip-set (you really need 2 or 3 chips to get extended addressing an peripheral I/O functions).

Were they a reliable source (and how did you pay them)?

[isa-d]

This is the CPU with also a 6100



H it's the Harris logo, I hope Harris didn't made two different chips with the same part number (6120) and same package (DIP 40 pin)

There are various distributor in USA with this part number, HD1-6120-9, in stock, try to ask a quote.
I bought mine on Taobao (China) but was an used socket pull, so not sure if work or not, price was very low, about 10 euro, but I bought it with other chips so postage was combined.
The only way for buy it on Taobao it's to contact a service like this
http://www.taobaobroker.com/
it will buy the chip for you

[pbirkel]

[quote="isa-d"]
I took Harris 6120 was only an improved version of 6100
or do you mean the 5 chip-set CPU MCP-1600 (LSI-11) used on various DEC machine?[/quote]

Well, yes, it is "improved" by supporting the full PDP-8/e instruction set, including on-chip extended memory addressing (32K main, 32K control panel). The 6100 is basically a "straight eight"; you need additional chips to implement just the original extended-addressing 32K main memory (base memory is only 4K).

Agree that the MCP-1600 is something else :->.