[Coco] Coco flash cartridge

[Mark McDougall]

Steve Bjork wrote:

> On a CoCo 3, the ROM Pak could be up to 32k address space and is anyway 
> to support that size of cart?  This would let us write games like 
> Rampage for your Flash Cartridge.
> 
> After looking over your design, the A14 line could be connected to a 
> little logic (think NAND gate for U3) for a 16k/32k switch to support 
> both 16k and 32k addressing.

How does the address decoding work for a 32K cartridge??? IIUC CTS# decodes 
$C000-$FFEF, so decoding $8000-$BFFF would contend with the mainboard ROMS?!?

> On side note, there were some 64k games that used a bank switch, but no 
> need to try to support them.

If I ever get to do the 'proto' version with a CPLD, it will support 
8/16/32KB ROMS plus heaps of bank-switching...

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"