[Coco] Cartridges that use SCS decoding
jrosslist at outlook.com
Thu Mar 9 16:51:56 EST 2017
Ahhh, the hardware lingo of this thread!
It sounds cool, I wish I understood it to the degree you guys do! Perhaps someday, I'll have the time to learn it.
From: Coco <coco-bounces at maltedmedia.com> on behalf of Zippster <zippster278 at gmail.com>
Sent: Thursday, March 9, 2017 8:41 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Cartridges that use SCS decoding
Good point Jim. I do something similar with the PSG.
There is a bit in the control register (SCS space), that software must explicitly
set to enable writes to CTS space and enable SLENB.
> On Mar 9, 2017, at 12:53 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> On 3/9/2017 12:44 PM, Zippster wrote:
>> You can use SLENB.
> I would add that you need to a way to decode the writes. Since CTS will not be driven, you'll need to construct a pseudo-CTS signal, and you'll need to guard against doing so simplistically, since a wrote the $c000 could be for the external EEPROM/RAM/FLASH, or it could be for the internal RAM. I use a flag in SCS space to denote writes are allowed in FLASH space.
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