Extended memory and SNApshots in emulators

[VELESOFT]

Exist any snapshot fileformat that support extended memory for russian ZX clones ? I see only Z80 fileformat with 48/128 and 256kB(ZS Scorpion 256) support. Why isn't supported other snapshots for Pentagon 512/1024/ATM turbo, etc.. ? SNA 128 is easy format, but support only 128kB memory and not contain some other info (ay registers, tacts counter, computer type ...). My idea is add new computer types to Z80 fileformat.

http://www.zxmodules.de/fileformats/z80format.html

Z80 contain one byte for set HARDWARE MODE (computer type) and actually contain only 17 supported values:

0-8 = zx models (16/48/128/+2/+2A/+3...)
9 Pentagon 128k
10 Scorpion 256k
11 Didaktik+Kompakt
12 Spectrum +2
13 Spectrum +2A
14 Timex TC 2048
15 Timex TC 2068
16-127 = unused / reserved for next zx clones
128 Timex TS 2068

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