Re: [hatari-devel] Valid memory amount?

[David Savinkoff <dsavnkff@xxxxxxxxx>]

----- On Nov 19, 2020, at 2:43 PM, Eero Tamminen oak@xxxxxxxxxxxxxx wrote:

> Hi,
> 
> On 11/20/20 12:12 AM, Nicolas Pomarède wrote:
>> Le 19/11/2020 à 23:04, Eero Tamminen a écrit :
>>>  > OK for it then, but does it really make sense to allow 512 for
>>> falcon ?
>>>
>>> Does it really make sense to allow 128KB & 256KB
>>> for ST/STE/TT? :-)
>> 
>> Well yes, because the MMU can be configured for these RAM configuration
>> without specific HW modifications. There might not have been real
>> machine with 128 KB, but it seems there was an early 260ST with 256 KB.

Maybe there was someone in an Atari lab with a 520ST prototype and
piggybacked 128K waiting for 256K to become available
(the anticipation!).
That 128K would go into bank switched RAM for a C64 later (Yesss!)


>> 
>>>  > AFAIK the min config was 1M
>>>
>>> 1MB might be a minimum shipped Falcon config, but
>>> according to comments in Hatari code, 512K has
>>> been tested to be also supported, see:
>>> https://git.tuxfamily.org/hatari/hatari.git/tree/src/stMemory.c#n368
>> 
>> Does it work with normal TOS4 or a patched one ? I don't remember if
>> TOS4 expect at least 1MB in falcon mode ?
> 
> Well, at least it boots fine and its desktop seems
> to work fine in Hatari with 512KB RAM, regardless
> of whether MMU is enabled or not, when using:
>	"--fast-boot off --patch-tos off"
> 
> 
> 	- Eero