[Coco] RS-232 Pak Back to Stock

[Gene Heskett]

On Wednesday 03 April 2013 22:01:32 John E. Bielak did opine:

> I picked up a deluxe RS-232 pak thats somewhat modified that I'm trying
> to put back to stock.
> 
> The changes:
> - The ROM has been cut out

Leave that as it, its far more useful w/o it.

> - The trace for pin 4 cartridge edge connector has been cut and there is
> a wire going out to an external connecter

That is the IRQ line, put it back AND if using an MPI, pull 3 of the 4 
pullup resistors from the 4 connectors pins 8, and jumper all pin 8's 
together.  No more missed incoming characters.  And doesn't need an 
external wire to get the IRQ into the coco when the slot select switch or 
logic isn't set to the slot the cart is in.

> - There's a jumper between E1 and E2
> - A jumper appears to have been removed from E3 and E4

That doesn't ring any bells, consult the manual on that.
 
> Obviously,  I need to desolder the old ROM pins, put a socket in, drop
> in a 4K EPROM (2732?) with the cart image, and then reconnect trace to
> connector pin 4, but I don't know what to do with the E1 - E4 jumpers.
> I've Googled around and the only examples I've been able to find are
> other modded boards, nothing that appears stock.
> 
> -JEB-
> 
> --
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> Coco at maltedmedia.com
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Cheers, Gene
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