Re: Switchless ROMs

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Thu, 29 Dec 2016 19:11:20 +0100 Message-ID: <4deb175d-b8ec-9639-9e9a-0b0dbb48f67e@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/29/2016 06:45 PM, Jim Brain wrote:
> On 12/29/2016 3:57 AM, silverdr@wfmh.org.pl wrote:
>> If we want to keep compatibility - I am afraid the answer is "yes". A
>> simple example: a program uses the RAM area under KERNAL as a
>> temporary storage and reads from the consecutive addresses there. I
>> know for a fact that such programs exist. So you would need to monitor
>> the configuration bits or the _CS or ...
> I do plan to check _CS, so the RAM access won't affect this.

Yes, but copying the KERNAL to RAM for patching purposes will. From the 
ROM it's 2 consecutive accesses to the 2 bytes containing the RESET 
vector when you do that.

  Gerrit

       Message was sent through the cbm-hackers mailing list