Harris 6120

 
Post new topic   Reply to topic    CPU-World.com forums Forum Index -> Want to Buy (collectible items)
View previous topic :: View next topic  
Author Message
pbirkel



Joined: 24 Jan 2012
Posts: 3

PostPosted: Tue Jan 24, 2012 4:40 am    Post subject: Harris 6120 Reply with quote

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.
Back to top
View user's profile Send private message  
isa-d



Joined: 16 Aug 2006
Posts: 1769
Location: Italy

PostPosted: Tue Jan 24, 2012 6:57 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message  
pbirkel



Joined: 24 Jan 2012
Posts: 3

PostPosted: Tue Jan 24, 2012 7:27 am    Post subject: Reply with quote

[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)?
Back to top
View user's profile Send private message  
isa-d



Joined: 16 Aug 2006
Posts: 1769
Location: Italy

PostPosted: Tue Jan 24, 2012 3:53 pm    Post subject: Reply with quote

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) Exclamation

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

Quote:
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).

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?
Back to top
View user's profile Send private message  
pbirkel



Joined: 24 Jan 2012
Posts: 3

PostPosted: Wed Jan 25, 2012 3:02 am    Post subject: Reply with quote

[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 :->.
Back to top
View user's profile Send private message  
Display posts from previous:   
Post new topic   Reply to topic    CPU-World.com forums Forum Index -> Want to Buy (collectible items) All times are GMT - 5 Hours
Page 1 of 1
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Powered by phpBB © 2001 phpBB Group