The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
Sea.dog:
That should be a doddle for you to troubleshoot, Andrew :med:
There are some cheap, UK stocked ones on eBay - https://www.ebay.co.uk/itm/224365359347
Obviously the first thing that you'll check are the "easy" surface mount components. I would not expect there to be any problem with the resistor packs, but you never know.
awemawson:
I've started 'knife and forking' my way about the board - even made up some extra sharp probes - then realised jottings in my note book weren't going to cut the mustard. So I dug out an old copy of Protel DXP to start drawing the circuit, but failed at the first hurdle as I can't find a component library for Protel that has the NEC uPD43256v 32k x 8 RAM chip, and although I could draw one up myself it gets extremely long winded.
My copy is dated 2002 so I would have expected it to be in the 'known chips' provided by Altium, but it isn't
. . . my head hurts . . :coffee:
AdeV:
The uPD43256v seems to be an ultra-elusive chip; I can only find 2 references on the googlemachine... neither of which are useful.
Maybe it'd be worth contacting NEC directly for a pinout, and you'll definitely have to draw your own symbol!
Is it definitely the "V" variant (16 pin single-in-line)? The DIP version ("C" variant) returns waaay more results.
AdeV:
If the "V" was actually a fat-fingered "C" :lol: then this page might help: https://componentsearchengine.com/part-view/UPD43256BCZ-85L/NEC
As I'm registered, I downloaded the file & it has an Altium footprint in it... I can forward it to you if you like.
awemawson:
Ade,
Thanks but I have the pin out and a copy of the data sheet. I started defining the chip as a component in Protel just before supper, but then realised that I'd made the outline far too big. I'll re-do it in the morning. It's just to be able to draw a readable circuit diagram that I can easily modify, I don't intend to incorporate the twinkly bits for Spice modelling etc as I don't need them.
Last time I did this I was resurrecting the Numericon 850 control on a Chipturn CNC lathe back in 2012 so my memory of the 'how to's ' is rather hazy - after all it was four CNC lathe rebuilds ago !
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