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Crab Apple BIOS; minimal Apple I replica (6502 homebrew)
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Boot and BIOS menu to configure my minimal Apple I replica; Crab Apple.
This is a very (VERY) simple design for anyone wanting to build their first computer. It uses a 6502 with 32k RAM, 8k ROM, 7400 (quad NAND) and a PIC18F as the serial chip.
The PIC18 also provides the system clock and reset. The clock speed, BAUD rate and text colour can be changed through the BIOS menu after reset.
This is a very (VERY) simple design for anyone wanting to build their first computer. It uses a 6502 with 32k RAM, 8k ROM, 7400 (quad NAND) and a PIC18F as the serial chip.
The PIC18 also provides the system clock and reset. The clock speed, BAUD rate and text colour can be changed through the BIOS menu after reset.
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