I have school TV setup that needed an external HDMI audio/video output as secondary monitor on windows xp system. Most models were using a variant of 6502 CPU at a clock speed of 1.023 MHz.I found cheapest way to trick pc by physicaly making an dummy VGA (XGA,RGB) analog connector by simply putting three resistors from 50 up to 150 ohms on some connections. Later on the BASIC interpreter was replaced by Microsoft's AppleSoft BASIC, and the hardware design went through on several iterations. The original Apple was introduced in 1977, including Integer BASIC and Assembler Monitor functions.

BASIC: and prefixes don't work for DATA entriesThe resistors works as and answering mashines and if GPU sends R/G/B signals it is transfered to receiving pins and fooling the GPU that is actualy monitor on that VGA port connected. Use Ctrl+N to switch to the X16 upper/lower character set for a workaround. Provide an option for virtualization.Emulator: LOAD' (and LOAD'',1) will show host uppercase filenames as garbage. Features: Range of keyboard mapping options to enhance your gaming experience.

Mac Extended Display Emulator