[Coco] Educate me about Y-Cables

[Kip Koon]

Hi Joe,
To use a couple of packs on a Y cable be sure to know what memory addresses each pak responds to.  If both devices use the same address, then they cannot be used on a Y cable and a MPI is definitely required.  I believe there are memory maps floating around that specify what paks use which memory locations.  The following link to my dropbox called the "Coco Hardware Address.pdf" is one that I have on hand.  
https://www.dropbox.com/s/axfqsee5pfyirkt/CoCo%20Hardware%20Address.pdf?dl=0
I hope it helps.

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon



-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Joe Grubbs
Sent: Friday, February 20, 2015 9:18 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Educate me about Y-Cables

Yeah I'm really looking for a small footprint kind of solution so I can use my CoCoSDC alongside the modem or rs232 pak. Otherwise I'd just try to find a full fledged MPI.



--- Original Message ---

From: "Zippster" <zippster278 at gmail.com>
Sent: February 20, 2015 9:09 PM
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Subject: Re: [Coco] Educate me about Y-Cables

I guess I was really thinking something very simple mainly so I could use 1 additional slot.  Like an SDC along with a real floppy, or sound cart, or RS-232, etc.

I think someone else is working on a new MPI (Retro Innovations?) so I didn’t really want to get into that at the moment.  Buffering and some DC power from a wall-wart is easy enough though.  I'll see what I can come up with.

- Ed


> On Feb 20, 2015, at 4:32 PM, David Ladd <davidwladd at gmail.com> wrote:
>
> On Fri, Feb 20, 2015 at 3:31 PM, Nick Marentes 
> <nickma2 at optusnet.com.au>
> wrote:
>
> Maybe a buffer cartridge with a ribbon cable to a seperate box placed 
> back
>> a bit from the CoCo to eliminate the "flux-capacitor" monstrosity 
>> glued to the side of the CoCo  (the Tandy Multipac with an assortment 
>> of varying size cartridges and cables standing up in the air looking 
>> like a science project experiment).
>>
>> The "new" multi-pac design then wouldn't need the buffering and can 
>> house the power supply while the CoCo keeps it's sexy slim lines.
>>
>
> ​Actually the buffering would still be needed as the TTL Chips in the 
> CoCo can only supply so much current per line.  That's why ribbon 
> cables with 3 connections were the max that people would go.
>
> I have seen first hand what happens when you try to go beyond those 
> tolerances.  You let the smoke out :O
>
> Other than that I think the vertical design of the MPI was to allow 
> the carts to dissipate heat better as a horizontal placement of the 
> carts would mean the top most cards would get heat from the lower 
> ones.  Or at least that was my understanding for the design.​
>
>
>
>>
>> Nick
>>
>>
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