[Coco] 32K carts?
joef6809 at gmail.com
Tue Oct 23 12:35:38 EDT 2007
Any first hand info on 32K carts? I would assume they are the same but you
know what happens when you ass u me!
Worst case is I'll have to trace the pins and make sure they go to where I
think they should.
----- Original Message -----
From: <jdaggett at gate.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, October 23, 2007 11:48 AM
Subject: Re: [Coco] 32K carts?
> The internal ROM in the Coco 3 is a 27256.
> On 23 Oct 2007 at 10:48, Joe wrote:
>> That is interesting. I wonder now if all the 32K images floating
>> around the net are backward like that. When I was working on getting
>> these running I jut assumed the images were correct and my MMU
>> emulation was off. now I'm not sure. I've got a real Rampage! cart.
>> Does anyone know if the chip inside it is pin compatible with a 27256.
>> I'll try to pry it out and read it on an external Eprom programmer.
>> ----- Original Message -----
>> From: "Mark McDougall" <msmcdoug at iinet.net.au>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Tuesday, October 23, 2007 5:37 AM Subject: Re: [Coco] 32K carts?
>> > Joe wrote:
>> >> When you switch to 32K External it gets wierd.
>> >> $C001 to Whatever is mapped to the first 16K of the ROM and $8000
>> >> to $C000 maps to the last 16K of the ROM. This makes sense as any
>> >> code running from rom say at $C??? would need to turn on 32K
>> >> External mode, but when that happens if it was a liner map the code
>> >> that was executing would "jump up" 16K.
>> > Thanks Joe - that's done the trick. I had to swap the upper and
>> > lower 16KB in Arkanoid and it runs now! Presumably Rampage has the
>> > same issue.
>> > I need to order a couple of more passives now to be able to test the
>> > flash option and the "Flash2" cart.
>> > For those few interested, I'll do some pricing very soon. I've been
>> > ultra-busy the last few weeks and have only been able to devote the
>> > odd minute here-or-there to this project...
>> > Regards,
>> > --
>> > | Mark McDougall | "Electrical Engineers
>> > do it | <http://members.iinet.net.au/~msmcdoug> | with less
>> > resistance!"
>> > --
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>> > Coco at maltedmedia.com
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