ROMs
Examples
These days there's so much technology and ways you can learn. There are videos and CD roms.
$1 contains a register with control bits for enabling/disabling the system ROMS as well as the I/O area at $D000.
American machines, or those with a second processor, may have US BASIC or HIBASIC: the ROM routines will not be in the same place for these ROMS."
Android ROMs also use this type of checksum.
As the processor could only address 64 kB at a time, the ROM was mapped into memory and only 38,911 bytes of RAM (plus 4 kb between ROMs) were available at startup.
External ROMs were developed with Ace Forth to be used as control applications. citation citation System Architecture The ACE had an 8 kB ROM containing the Forth kernel and operating system, and the predefined dictionary of Forth words in about 5 kB.