\n\n
The figure below shows the memory maps of the real KIM-1 and the KIM Uno next to each other. The core point being, ROMs have been added in unused parts of the KIM's memory map. Given there are 1152 bytes RAM and 2K ROM, there's plenty of empty space to fill... the limiting factor is the 32K Flash available within the atMega328.
\n\nSome small utilities are preloaded into RAM at boot time, rather than added as ROM. They can just be overwritten if not used. Back in the day, they were typically loaded from tape before starting to code on the KIM-1. Having them preloaded is a nicer option...
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\n\nA ROM with the VTL-02 programming language resides at FC00.
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Calculator-sized KIM-1.
\n\tOpen source hard/software - see downloads here.
\n\tFull emulation of 6502 & unaltered KIM-1 ROM on an Arduino Pro Mini (atMega328).
\n\tIncludes serial port (ie, you can use a PC as external keyboard/screen).
\n\tPartial emulation of the 6530 I/O chips. Display driven through ROM, not yet by hacking of I/O registers.
\n\t
Extras:
\n\n\t6502 Programmable Calculator Mode. A floating point ROM with 38 math functions is built in, special display functions & instructions are added to make the programmable calculator easy to use.
\n\t\tAdditional ROMs and preloading of software into RAM let the KIM Uno start up with a tool set that any KIM-1 programmer really needed back in the day: Disassembler (Baum & Wozniak), Relocate & Branch calculator (Butterfield), Movit (Edwards).
\n\t\tMicrochess built in to ROM. 'Dual screen' version with optional display of chess board on serial port.
\n\t\tOn-board 1K EEPROM either serves as permanent ROM storage or as an extra 1K of RAM.
\n\t\t
The single connector on the Pro Mini serves as power connector, serial port and to update firmware.
\n\tExpansion port provides SPI and I2C, accessible by or through the emulator. This makes it simple to add SD mass storage, or WiFi connectivity or just things like temperature sensors.
\n\tExpansion port also allows any other Arduino to use the board when the on-board Pro Mini is removed.
\n\t