Just poking around in the video chip would enable the second bank of 32K RAM for writing. Then copying the basic ROM by reading the ROM and writing the RAM would make it possible to switch to the next stage, which was to enable the second bank of RAM for reading and writing.

After that a relocation routine took care of moving the ROM code to the upper portion of the RAM which left you with 48K of usable RAM in BASIC and 64K - the video mode you were using for assembler!