Re: Crystal Castles ROM Address Range

Thank you very much Clay for the info. I will give it a try over the weekend.

Thanks

Justin

Sent from my Verizon Wireless 4G LTE DROID

David Shoemaker <davids@oz.net> wrote:

>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 23:47:29 2012