[Coco] Another review...

[sales at gimechip.com]

Thanks for the review Brian :-)
For those interested, you don't actually have to buy the kit from me - I've 
posted all pertinent information regarding the GAL mod for the 26-3124 
M.P.I. here:
26-3124 MPI CoCo 3 Upgrade #2
Note, however, If you intend to do the modification yourself, as Mark 
Marlette pointed out, it would be cheaper to do the 74LS10 modification, 
which I have posted here:
26-3124 MPI CoCo 3 Upgrade #1
Both Modifications are functionally equivalent. I just enjoy working out 
different ways to achieve the same results. The CoCo and Sinclair Computers 
are the Hobby that keeps me sane.

Also, if you need the mod for the 26-3024 M.P.I., it is posted in the #2 
link above as a comment.
The code for that mod is as follows:
Name 26-3024 M.P.I. Upgrade ;

PartNo GCC-3024.01 ;

Date 6/1/2010 ;

Revision 01 ;

Designer J&R ;

Company GIMEchip.com ;

Assembly 26-3024 M.P.I. Upgrade PAL for CoCo 3 ;

Location U6 ;

Device g16v8 ;

/* ***************************************** INPUT PINS 
**********************************************/

PIN 01 = !FFXX; /* LOW For Any Address Between $FF00-$FFFF */

PIN [2..9] = [A7..0]; /* CPU A7 - A0 */

PIN 11 = RW; /* READ = 1, WRITE = 0 */

PIN 12 = E; /* E-Clock */

PIN 13 = Q; /* Q-Clock */

PIN 18 = !CTS; /* Cartridge Select Signal. */

PIN 19 = !SLENB; /* Input To Disable Device Selection. */

/* ***************************************** OUTPUT PINS 
*********************************************/

PIN 14 = !DBEN; /* Enables The Multi-Pak Interface Data Buffer */

PIN 15 = !IOR; /* Read the Slot Select Latch. */

PIN 16 = !IOW; /* Write the Slot Select Latch */

/* ***************************** LOGIC EQUATIONS & VARIABLE DEFINITIONS 
******************************/

FIELD ADDRESS = [A7..0]; /* */

LATCH = ADDRESS:[7F]; /* Slot Select Latch@$FF7F */

IOR = LATCH & FFXX & E & RW; /* Active on $FF7F and E=1 and RW=1 */

IOW = LATCH & FFXX & E & !RW & !Q; /* Active on $FF7F and E=1 and RW=0 and 
Q=0 */

DBEN = (ADDRESS:[40..7F] & FFXX) # SLENB # CTS;/* Active $FF40-$FF7F or 
SLENB or CTS */

/* 
***************************************************************************************************/

I copied and pasted that directly from WinCUPL, so let me apologize in 
advance if it doesn't come out right after I press SEND.

If I may be of further service to any of you, you need only ask - If I can 
help, I will. Your Friend via the CoCo - John

----- Original Message ----- 
From: "Brian Blake" <random.rodder at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, June 30, 2010 8:12 PM
Subject: [Coco] Another review...


> This time, I posted a quick review of the GIMEchip 26-3124 MPI GAL 
> upgrade.
> View it here:
>
> http://coco.randomrodder.com/reviews.html
>
> Hope it's informative for a few of ya'll out there..
>
>
>
> Brian
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco


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