Re: Crystal Castles ROM Address Range

Crystal Castles uses so-called bank selected memory, meaning that only a
portion of the total ROM is visible at any given time from a particular
address range.

>From a quick glance at the schematic, it looks like writing either a 0x00 or
0x01 to address 0x9E87 will switch banks of ROM. Put another way .1f and
.1h will appear in memory *or* .1k and .1l. 0xA000 (.1k and .1h) and 0xC000
(.1l and .1f)

You can write 0x9E87 with 0x00 or 0x01 from the 9010 controls to manually
switch banks and view/checksum ROM contents.

-Clay

> -----Original Message-----
> From: techtoolslist-bounces@flippers.com
> [mailto:techtoolslist-bounces@flippers.com] On Behalf Of
> Justin Johnson
> Sent: Tuesday, November 20, 2012 7:06 PM
> To: techtoolslist@flippers.com
> Subject: [Techtoolslist] Crystal Castles ROM Address Range
>
> This is my first post. I'm learning how to use my Fluke 9010
> and ran into a problem doing a CRC check on some of the ROMS.
> Looking in the
> MAME source code I found the address ranges for each ROM(see
> below).
> ROMs 304 to 305 work fine but the address appears to be out
> of range for ROMs 101 and 102. ROM 101 according to the
> source code should start at 10000-11FFF. What address should
> I be using? Where am I going wrong here??

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Received on Tue Nov 20 23:16:10 2012