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Hardware - MOS 7501/8501 Name: MOS 7501/8501 AKA: CPU Category: Chip Introduced: 1984 This is the CPU. The 7501 is a modified version of the 6502. The difference between the numbers (7501/8501) is that they were manufactured with different technologies. 7501 is manufactured with HMOS-1 8501 is manufactured with HMOS-2 8501R1 8501R1 (TH) Made in Thailand, different font for printed text. CSG 8501 A CSG (Commodore Semiconductor Group) branded 8501, manufactured week 14, year 1990. 8501R4 7501R1 7501R1 0184 Taken fron the crock's Commodore 232 prototype. Copyright © Plus/4 World Team, 2001-2013