| Re: [hatari-devel] About RAM size comments (commit 6c827e5) |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] About RAM size comments (commit 6c827e5)
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Sat, 2 Jan 2021 18:39:43 +0100
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Eero Tamminen schrieb:
So the limits are actually:
4MB:
- ST/MegaST/STE/MegaSTE (unmodified)
10MB, due to VME: [1]
- TT
- MegaSTE with HW mods
14MB:
- Falcon
- ST/MegaST/STE with HW mods
That's correct.
What about 6MB, is that actually a legal ST-RAM
amount? On all the machines?
As far as I know, there is nothing in TOS that would make 6 MB ST-RAM
illegal. As noted before, this requires a new MMU.
Btw. Has somebody actually done the TOS 2 ROM
15MB ST/MegaST HW setup?
Sorry, I was unclear before. 15 MB would be possible, if one does *not*
support TOS 2. (Because TOS 2 starts at $E00000 = 14 MB.)
However, I only know to actual MMU re-implementations -- from hearsay,
never had them myself: one by Martin Wevelsiep, that (according to [1])
would indeed support 15 MB in a MegaST, and the CoMMU from a company in
Vienna (design based on a diploma thesis), that is said to be limited to
14 MB.
Regards
Christian
[1] <https://www.stcarchiv.de/stc1991/12/news>
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: https://www.chzsoft.de/
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