Re: Emulator discrepancies (was DMA'ing in Commodore 64 for developing purposes.)

From: tokafondo <tokafondo_at_tokafondo.name>
Date: Wed, 15 Jun 2022 20:26:51 +0100
Message-ID: <bd2ec742-731a-e4f2-4396-d566a8b90aae_at_tokafondo.name>
El 15/06/2022 a las 20:05, smf escribió:
> Right, it's fine for some things, but if your code requires accurate
> timing (which is very common with c64 code) then not being able to stop
> the vic2/sid/cia etc chips will make it pretty much worthless.
> 
> Even dma'ing memory is going to be problematic as the cpu will have to
> stop. But it would make a killer downloader.
> 
> A new motherboard with dual port ram would be cool

Of course that there is no way to freeze the complete computer but only the CPU as the VIC-II does.

But DMA'ing would make testing almost instant. Imagine an IDE that once compiled, instead of creating files to be burnt in a ROM, or files to be copied to a image disk, would "transfer to C64 memory" directly so changes would be see on the fly.


> 
> On 15/06/2022 17:49, Bill Degnan wrote:
>>
>> I'd like to clarify my use of an in-circuit emulator, which is not an
>> "emulator" of a C64.  It's just a CPU emulator. You literally plug the
>> in-circuit emulator into the 6502 slot and run the cable into the
>> hardware unit.  The hardware unit has a serial interface that allows
>> you to step machine instructions, load programs, move/inject/change
>> values within a block of RAM, take snapshots of RAM and save the log
>> session as a text file, etc.
>> Bill
> 
Received on 2022-06-15 22:00:43

Archive generated by hypermail 2.3.0.