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Memory expander

The Mega-Cart can be used as configurable Memory (RAM) expander/unexpander.  By using the on-screen menus, you can select a specific memory configuration for the Vic-20's BASIC mode without having to remove the cartridge and flip dip-switches.

There are many ways to select a memory configuration.  The easiest is to hold a function key on boot:

Key

Information
Start the Vic Unexpanded (with 32K Read Only No auto)
Start the Vic +3K Ram (with 32K Read Only No auto)
Start the Vic +32K Ram (No auto)
Start the Vic full Expanded with EASYLOAD+ in RAM on BLK 5
Start the Vic Unexpanded with SJLOAD active on BLK5 *
Start the Vic +3K Ram with SJLOAD active on BLK5 *
Start the Vic +32K Ram with SJLOAD active on BLK0 (3K RAM area) *
Start the FILE BROWSER to launch any program from classic or sd2iec based drives *
* from revision 20 (November 2010).

In addition, the Early Startup menu contains two special submenus (Normal & Soft Reset) that allow you to start up the Vic-20 with various memory configurations (with relative characteristics).

The Normal Reset sub-menu contains many memory configurations (some offering additional utilities like Super expander or Programmer's Aid).  If you select a configuration with 32K in Normal Reset mode, any ROM image on BLK5 will be automatically started (if previously loaded in memory).

If you prefer, you can lock this sub-menu and always start the Mega-Cart from the Normal Reset menu instead of the default Early Startup menu.  To do this just hold the "4" key on boot.  You can re-enable the Early Startup menu by holding down the “0” (zero) key while booting.

Full list of Normal Reset configurations and relative information.

The Soft Reset (No Auto) sub-menu contains memory configurations with 32K RAM always present (Read/Write or Read Only).  Note: if you select any of these configurations, ROM images on BLK5 will not be started even if previously loaded into memory  (like with normal Vic-20 RAM expanders).  In this way you can inspect and (according to the selected RAM configuration) even edit the memory using a monitor or any other tool.  You can at any time start a ROM image on BLK5 by typing SYS64802 (standard Vic-20 soft reset call).

If you prefer, you can lock this sub-menu and always start the Mega-Cart from the Soft Reset (No Auto) menu instead of the normal Early Startup Menu.  To do this just hold the "5" key on boot.  You can re-enable the normal Early Startup menu by holding down the “0” (zero) key while booting.

Full list of Soft Reset (No Auto) configurations and relative information.