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RE: [N8VEM-S100:1825] S-100 6502 CPU V2 boards -- almost there!

Two things guys, first please remember there is risk here, as with all these boards there is the possibility of a dud. While this board is better than most (been through 3 revision prototypes), Murphy may still strike! 


Second for those that can afford it, I really recommend getting two bare boards. With all the boards Andrew and I have done I always build two identical boards. I don’t know how many times over the years flipping a misbehaving/damaged board with a second identical one saved my skin.  Because I do a lot of prototype/experimental work, screw-ups on the bus are more common than they should be.  One big advantage of the S-100 bus is you can quickly localize where the problem is – at least to the board.


Once localized to the board, if after analyzing the key signals the problem is not identified, I tag all chips on the non-working board with “white-out” paint and systematically substitute them with chips on the working board.  This (frustrating) technique is very useful in identifying damaged/marginal chips that render the bus unreliable. I.E. they are not dead but act up as they heat up etc. 


While on this, remember the other trick to identify such a chip is to spray them with Freon. A temporary recovery is a dead giveaway.


Anyway just a thought.


BTW when the 6502 board arrives I will write up a step by step building outline.






John Monahan Ph.D

e-mail: mon...@vitasoft.org

Text:    mon...@txt.att.net



From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Andrew Lynch
Sent: Saturday, August 17, 2013 8:10 AM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:1825] S-100 6502 CPU V2 boards -- almost there!




If you are considering getting an S-100 6502 CPU V2 board please let me know. 


We are almost to the 20 board threshold for a PCB order.  There are 17 boards for builders in the wait queue already.


Don’t worry, I’ll still have “skin in the game” since I’ll need to distribute 25 boards just to break even on the PCB manufacturing order.


The S-100 6502 CPU V2 PCBs are $20 each plus shipping.  Please send a PayPal to LYN...@YAHOO.COM


Shipping in the US is $3 for a single PCB and $2 for each additional PCB.  Shipping internationally is $10 for a single PCB and $3 for each additional PCB.  This is for the bare basics USPS first class postage with no tracking or insurance.  The builder assumes all risk of delivery as per usual arrangement.


Whatever is left can go to the rest of the builders and late comers.  If there are surplus they can go to VCGM and/or eBay.


Thanks and have a nice day!

Andrew Lynch

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