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Re: Learning KiCad - Lazyport Prototyping Board

Hi John,
thanks for the feedback,
I will add pullups to P6, P7 on U6
I also will use the second MMV as suggested ( I didnt think of doing that )
Jumper block K3 sets the input voltage to the second regulator depending on if a 7812 regulator or a LM3940 (3.3v) regulator is used, K4 sets the LED bias current depending on if we have a 12v or 3.3v output voltage.
It has also ocurred to me to bring the INT* signal to connector P7 as it might be needed for some projects
I will make changes over the weekend and report back
David Fry

On Wednesday, May 21, 2014 11:01:55 PM UTC+1, David Fry wrote:
Hi All,
I like a number of others on the forum have over the last couple of weeks been starting to learn how to use the KiCad workflow process, I just though it might be interesting to share what I have been doing with the program and get some feedback from other members on the forum.
I have been developing another S-100 prototyping board for my own purposes, yes I realise that there are at least 3 others currently available, two of which are dedicated to providing as much prototyping area as possible. This proto board is aimed specifically at I/O port addressed projects and takes a different approach in supplying pre-wired all the necessary S-100 port decode logic and data line buffers/control and presenting all the necessary signals to 3 SIL connectors close to the prototyping area. I am not taking any credit for the design as it is taken directly from the S-100 IDE board I'm just re-cycling the circuitry to make port addressed prototype projects quicker to produce.
The board has positions for two voltage regulators, one for the 5v rail, the other can be jumpered for either 12v or 3.3v
Regulators have been positioned to allow heatsinks to be fitted as required.
Both supply rails and gnd connections run along left hand edge of proto area to facilitate horizontal orientation bussed supply rails
Port addressing can be jumpered for 8 or 16 bit I/O port addresses
Port address jumpering for a 2, 4, or 8 I/O port window
An addition of a Monostable Multivibrator to drive the Board Enable LED
Lower 8 bits of address bus buffered for allow further decoding
All signals brought to 3 SIL connectors along edge of prototype area
My question to all you all is, have I missed anything out with regard to features/signals needed for port I/O based projects ?
John, I would be particularly interested in your input
I have attached the schematic and a board layout to this post, If there is sufficient interest in the community for this board then I am quite happy (once ironed out) to hand it over to the guys doing pcb production.
David Fry