C128/C65/MEGA65 Bank switching

Es gibt 7 Antworten in diesem Thema, welches 3.166 mal aufgerufen wurde. Der letzte Beitrag (6. März 2020 um 00:53) ist von adtbm.

  • Don't forget, that you have more than 2 Banks available in the MEGA65, because it comes with build-in memory extension :wink:

    Bitte melde dich an, um diesen Link zu sehen. <- here you can find all MEGA65 related files, games, etc.

    Bitte melde dich an, um diesen Link zu sehen. <- MEGA65 main Homepage. links to all important MEGA65 sites (links on top of the page to Files, Forum, GitHub, Manual,etc.)

    Bitte melde dich an, um diesen Link zu sehen. <-Pauls Blog - constant updates about current tasks, project status, etc.

    Bitte melde dich an, um diesen Link zu sehen.,Bitte melde dich an, um diesen Link zu sehen. <- All Open-Source information regarding MEGA65. Found Bugs ? create an issue there please!

    Bitte melde dich an, um diesen Link zu sehen. <- Join for live chat support and more --- The Future is 8-bit !!!

  • I know, but I already asked if the BASIC 10 really can access more than BANK 0 and BANK 1.

    Hint: Moving DATA from BANK X to BANK 0/1 with MAP DMA (Stash/Fetch/Swap) is not meant.

    That's only moving Data from extended memory to 'BASIC-Memory.

    In other words: can the cpu directly access the extended memory?

    I try explain in C128- language.

    The 4502 can access 1MB, this is equivalent to C128 with 'full' MMU capability, where MMU bankswitches parts of the 1MB into cpu's '64k viewport'. The extended memory is more like the REU, where you must fetch,stash or swap parts within the range the MMU can see (and thus make availlable to the cpu).

  • Now i got you ! I'll check back with Paul.

    Bitte melde dich an, um diesen Link zu sehen. <- here you can find all MEGA65 related files, games, etc.

    Bitte melde dich an, um diesen Link zu sehen. <- MEGA65 main Homepage. links to all important MEGA65 sites (links on top of the page to Files, Forum, GitHub, Manual,etc.)

    Bitte melde dich an, um diesen Link zu sehen. <-Pauls Blog - constant updates about current tasks, project status, etc.

    Bitte melde dich an, um diesen Link zu sehen.,Bitte melde dich an, um diesen Link zu sehen. <- All Open-Source information regarding MEGA65. Found Bugs ? create an issue there please!

    Bitte melde dich an, um diesen Link zu sehen. <- Join for live chat support and more --- The Future is 8-bit !!!

  • Partially it's hard to explain, coz BANK is used in 2 different meanings.

    Bitte melde dich an, um diesen Link zu sehen.: Real existing hardware 64k RAM Bank and

    Bitte melde dich an, um diesen Link zu sehen.: The BASIC command 'BANK', which in fact doesn't mean a RAM-Bank but a configuration of memory.

    In case of FRE(x) we talk about real RAM-BANKs

    But you can't use pE BANK 5 to 'switch' to the 5th real RAM-BANK.

  • Partially it's hard to explain, coz BANK is used in 2 different meanings.

    Bitte melde dich an, um diesen Link zu sehen.: Real existing hardware 64k RAM Bank and

    Bitte melde dich an, um diesen Link zu sehen.: The BASIC command 'BANK', which in fact doesn't mean a RAM-Bank but a configuration of memory.

    In case of FRE(x) we talk about real RAM-BANKs

    But you can't use pE BANK 5 to 'switch' to the 5th real RAM-BANK.

    Additional info:

    When I activate Bank 2 & 3 in VICE, and I try to FRE(2), FRE(3) the answer is

    ?ILLEGAL QUANTITY ERROR

  • Because Bank 2 and Bank 3 on the c65 are ROMs ? Kernelroutines, etc...

    So a FRE(2) or (3) is not logical.

    Bitte melde dich an, um diesen Link zu sehen. <- here you can find all MEGA65 related files, games, etc.

    Bitte melde dich an, um diesen Link zu sehen. <- MEGA65 main Homepage. links to all important MEGA65 sites (links on top of the page to Files, Forum, GitHub, Manual,etc.)

    Bitte melde dich an, um diesen Link zu sehen. <-Pauls Blog - constant updates about current tasks, project status, etc.

    Bitte melde dich an, um diesen Link zu sehen.,Bitte melde dich an, um diesen Link zu sehen. <- All Open-Source information regarding MEGA65. Found Bugs ? create an issue there please!

    Bitte melde dich an, um diesen Link zu sehen. <- Join for live chat support and more --- The Future is 8-bit !!!

  • Because Bank 2 and Bank 3 on the c65 are ROMs ? Kernelroutines, etc...

    So a FRE(2) or (3) is not logical.

    No, I said "activate RAM BANK 2 & 3 in VICE x128."

    It is just that I think BASIC (neither 7.0 nor 10.x) was designed to use more than 2 RAM BANKS, one for programm, one for variables.

    Even GW-BASIC only initializes only 64k for BASIC in MS-DOS, that's why I think that from BASIC it's not possible to access more than BANK 0 and 1.

    On the other hand we can pretend that BASIC 7.x & BASIC 10.x are superior to GW-BASIC, because our 8-bit BASICs can use twice the memory (128K)

  • I have moved the discussion here regarding the Available Memory on the c65 with the help of Bank switching

    Bitte melde dich an, um diesen Link zu sehen. <- here you can find all MEGA65 related files, games, etc.

    Bitte melde dich an, um diesen Link zu sehen. <- MEGA65 main Homepage. links to all important MEGA65 sites (links on top of the page to Files, Forum, GitHub, Manual,etc.)

    Bitte melde dich an, um diesen Link zu sehen. <-Pauls Blog - constant updates about current tasks, project status, etc.

    Bitte melde dich an, um diesen Link zu sehen.,Bitte melde dich an, um diesen Link zu sehen. <- All Open-Source information regarding MEGA65. Found Bugs ? create an issue there please!

    Bitte melde dich an, um diesen Link zu sehen. <- Join for live chat support and more --- The Future is 8-bit !!!

  • adtbm 6. März 2020 um 01:30

    Hat den Titel des Themas von „C65/MEGA65 Bank switching“ zu „C128/C65/MEGA65 Bank switching“ geändert.