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ZX Spectrum => SOFTWARE => Wątek zaczęty przez: VELESOFT w 2013.06.22, 22:59:02

Tytuł: DIVIDE PLUS - new memory mode DIVIDE128
Wiadomość wysłana przez: VELESOFT w 2013.06.22, 22:59:02

More details here:

http://www.worldofspectrum.org/forums/showthread.php?t=44189 (http://www.worldofspectrum.org/forums/showthread.php?t=44189)

(http://velesoft.speccy.cz/other/DPLUSFAT.gif)

Tytuł: Odp: DIVIDE PLUS - new memory mode DIVIDE128
Wiadomość wysłana przez: Tygrys w 2013.06.23, 12:25:19

This feature isn't available on old GALs?

Tytuł: Odp: DIVIDE PLUS - new memory mode DIVIDE128
Wiadomość wysłana przez: VELESOFT w 2013.06.23, 13:32:44

Cytat: Tygrys w 2013.06.23, 12:25:19

This feature isn't available on old GALs?

With old GALs is possible use DIVIDE128 mode and other features as with new GALs, but there are a few restrictions :
1) is impossible use ESXDOS system
2) is impossible reset MAPRAM mode(this feature will supported in future, now you don't need it) and hardware stability of your DIVIDE PLUS is lower than with new GALs.

With old GALs you can test this modified version of FATWARE.

Tytuł: Odp: DIVIDE PLUS - new memory mode DIVIDE128
Wiadomość wysłana przez: VELESOFT w 2013.06.24, 15:19:35

Here is new table for memory paging on DIVIDE PLUS:

(http://velesoft.speccy.cz/other/divide128_mapram.png)

Additional info:

- each column can be used as classic 32kB divide mode for one divide system (port 23 select one of 16 possible divide systems/memory)
- one row is used as new 128kB divide memory (port 227 switch between rows)
- this table show memory layout in DIVIDE128 mode with active mapram (active MAPRAM = bit D6 of port 227 is set = rom with divide system is in write protect ram area)
- for DIVIDE128 mode without mapram must be used different table (similar, but not same). Without mapram is rom with divide system in rom chip, and ram pages in rom3 are without write protect. I can add this table later...