Digital Hardware
The digital hardware consists of:
• The 6502 (modified) CPU microprocessor
• The Alphanumeric Television Interface Controller (the ANTIC Display Processor)
• The Graphics Television Interface Adaptor (GTIA)
• The POT Keyboard Integrated Circuit (POKEY)
• The Peripheral Interface Adaptor (PIA)
• The Memory (ROM and RAM)
• Miscellaneous Iogic
• Memory Management Unit (MMU)
• Delay Line
6502 (modified) CPU Microprocessor
The 6502 (modified) CPU microprocessor contalns register flags, interconnections, arithmetic
logic, control logic, and all recognized operation codes. The characteristics of the
microprocessor are:
• Byte-oriented structure
• 151 opcodes
• Decimal and binary arithmetic modes Seven addressing modes
• True indexing Stack pointer
• Two interrupt levels 64K address range
• Integral clock circuit
• Single +5 volt DC power Requirement
Figure 1-4 is an illustration of the 6502 (modified) CPU Pin Assignments.
1200XL Home Computer
Field Service Manual 1-5
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