Re: MMU prototyping

From: Jim Brain <brain_at_jbrain.com>
Date: Wed, 23 May 2018 12:05:54 -0500
Message-ID: <9f07e5b4-71d6-ec83-b6eb-842f5a5672c1@jbrain.com>
On 5/23/2018 10:50 AM, Nejat Dilek wrote:
> On Wed, May 23, 2018 at 2:41 AM, Jim Brain <brain@jbrain.com> wrote:
>> On 5/22/2018 4:07 PM, Nejat Dilek wrote:
>>> Nice project!
>>>
>>> Does this also use hacks around the PLA like EasyFlash?
>> I guess it depends on what one defines as a "hack".  This unit simply
>> engages the GAME line anytime a memory access that should be outside the C64
>> is requested.  I think that is standard behavior.
>>
> "Hack" in my sentence was not used in a devaluing context.
No concerns here.  I just struggled to answer the question, since it 
seemed to be two questions:

If we define dynamically setting GAME, then it qualifies

However, EasyFLash attempts to use the cart lines to infer internal 
states and overrides address lines.  This cart does not do that.  It 
simply switches on standard Ultimax mode for the CPU cycle.

JIm

>
> Anyway, my actual curiosity was around the technical side actually.
> Easyflash employs a much broad "hack" to accomplish it's kernal
> replacement goal. So I understand this is much simpler to achieve.
> Much less obtrusive "hack" :)
Yep, I feel I am using the PLA for it's intended purpose.

Jim
Received on 2018-05-23 20:00:21

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