Re: Crystal Castles ROM Address Range

Hey Clay great description of the issue on this one.

Now do you have any F#(*)$#ing idea how to do that with Williams "classic"
hardware? Been pulling my hair out for way to long trying to figure out how
to do it on them. And while I am at it MCR III :)

David

-----Original Message-----
From: techtoolslist-bounces@flippers.com
[mailto:techtoolslist-bounces@flippers.com] On Behalf Of Clay Cowgill
Sent: Tuesday, November 20, 2012 8:16 PM
To: 'Technical Tools Mail List'
Subject: Re: [Techtoolslist] 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 23:23:30 2012