[Coco] Programmable Sound Generator Cart for CoCos
zippster278 at gmail.com
Fri Nov 25 15:41:06 EST 2016
Yes, if and when it’s told to…
Several banks in the upper 32K (ROM) region will be controlled by registers in the CPLD.
Either FLASH or RAM will be bankable into these under software control.
Default behavior on startup will be lower FLASH mapped to standard cart space, once the
software takes over, banks covering the 32K ROM space will be mapped to the added
memory as directed.
Very similar to what I used on the MC-10 board. Very flexible, but has to be managed
by software to be useful. Just extra resources at the programmer’s disposal.
> On Nov 25, 2016, at 1:42 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> On 11/24/2016 6:49 PM, Zippster wrote:
>> Some cool chiptunes coming to the CoCo soon.
>> I just finished drawing up a prototype using the YM2149 PSG. I’m hoping we’ll be
>> able to put it to good use along with the work Simon is doing. Of course there’s a large
>> amount of music already out there from other platforms that won’t be hard to convert
>> to get us jump started.
>> This is essentially the same thing as the MC-10 Supercart, but for the CoCo.
>> Should have some prototype PCBs in a week or so. :)
>> By the way, check out John and Neil’s latest Podcast for an interview with Simon.
>> Really enjoyed it guys!
>> Happy Thanksgiving everybody!
>> - Ed
> I can understand the ROM and the SSG, but how does the RAM fit into the picture? Does it occupy ROM space as well?
> RETRO Innovations, Contemporary Gear for Classic Systems
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