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

From: tokafondo_at_tokafondo.name Date: Sat, 18 Jun 2022 15:48:50 +0000 Message-ID: <da839ebcb006bc78af85a87905e98959_at_tokafondo.name>

15 de junio de 2022 21:00, "smf" <smf_at_null.net> escribió:

> Yes. If you are just going to use it for loading software from your PC,
> then some kind of freeze cartridge with
> https://www.mpja.com/download/ch376ds1.pdf hooked up to IO port should
> be pretty workable & cheap.
> 
> Actually DMA'ing is a pain and you still need to figure out what you're
> DMA'ing from.

For proper DMA, there are at least 24 lines for the address and data buses, and there are also the lines of PHI2, /DMA, RW and BA lines that need to be taken care of, AFAIK.

What device can be used to control 28 bits from a PC?

> On 15/06/2022 20:54, tokafondo wrote:
> 
>> Think that DMA'ing was precisely what the Z80 did in the CP/M
>> cartridge. It disabled the 6510 and dealt with the VIC-II.