[Coco] need a mini 6551 RS-232 pak layout

[jdaggett at gate.net]

Roger

I am familiar with both programs as well as Eagle. That would be a simple 
and easy task to do. Do you have any concept of size of theboard. I already 
have a template for a mini Coco plug in board in ExpressPCB that is 2.5 x 
3.8 inch. It has the fingers for plugging into the MPI.


james



On 15 Jan 2009 at 22:10, Roger Taylor wrote:

> I'm looking for someone who can help finsish designing the schematic
> and board layout for a mini RS-232 pak based on the rather simple
> schematics for the CoCoPro! RS-232 Pak.  As some know, this is nothing
> more than the schematics for the DC Modek Pak but with the phone modem
> circuitry removed.  It's just a 6551 and ROM mapped to the expansion
> port pins.  My version has an EPROM instead of the ROM.  There's 4
> chips and the board fits in a standard game pak case.  The board is
> already designed to fit any game pak and also a new case I'm looking
> at.  So, the mini RS-232 pak layout has to fit on this board.  I've
> already got the chips layed out similar to the DC Modem Pak's format
> but I'm having trouble with the trace routing.  Maybe that's because
> I'm not an expert at such.
> 
> The software needed is free, called ExpressSCH and ExpressPCB.  If you
> can use ExpressSCH/ExpressPCB and are good with design and the 6551,
> please submit a quote for what you think it's worth for you to finish
> laying out this board and test all the connections "on paper", etc. 
> 6551, 2764/27128 EPROM, 74LS04, 74LS133.. that's about it.  I'll work
> with you to help get this done so I can send off for 4 sample boards
> as quick as possible.  Give me an idea of what you'll need or not
> need.
> 
> I've got the base layout files, and about 75% of the schematic is
> drawn and some of the net connections are defined which helps
> ExpressPCB reveal what pins need to be connected with traces, etc. --
> Roger Taylor
> 
> http://www.wordofthedayonline.com
> 
> 
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