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The MOS 8500 Processor
In 1985 MOS produced the 8500, an HMOS version of the 6510. Other than the process change, it is virtually identical to the NMOS version of the 6510. The 8500 was originally designed for use in the modernised C64, the C64C. However in 1985, limited quantities of 8500s were found on older NMOS based C64s. It finally made its official debut in 1987, appearing in a motherboard using the new 85xx HMOS chipset.
 
The MOS 8502 was also based on the MOS 6510 that was used in the Commodore 64. The 8502 added the ability to run at a double (2.048 MHz) clock rate, in addition to the standard 1.024 MHz rate used by the Commodore 64. The pinout is a little bit different from the 6510. The 8502 has an extra I/O-pin and lacks the PHI2-pin that the 6510 had.
 
The 7501/8501 variant of the 6510 was used in Commodore's C16, C116 and Plus/4 home computers, and the 2 MHz-capable 8502 variant was used in the Commodore C128. All these CPUs are opcode compatible (including undocumented opcodes).
MOS CSG 8500
MOS CSG 8500 Top Side
CSG
8500
0590 24
MOS CSG 8500 Back Side
HONG KONG
HH042209
MP150SG
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Core Frequency:1 MHz
Board Frequency:1 MHz
Data bus (ext.):8 Bit
Address bus:16 Bit
Voltage:5 V
Manufactured:week 05/1990
Made in:Hong Kong
Package Type:Plastic
DIP-40
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MOS 8501
MOS 8501 Top Side
MOS
8501
1988 24
MOS 8501 Back Side
HONG KONG
HH162217
HC-10
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Core Frequency:1 MHz
Board Frequency:1 MHz
Data bus (ext.):8 Bit
Address bus:16 Bit
Voltage:5 V
Manufactured:week 19/1988
Made in:Hong Kong
Package Type:Plastic
DIP-40
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MOS 8501R1
MOS 8501R1 Top Side
MOS
8501R1
4784
MOS 8501R1 Back Side
HONG KONG
HH434102
2
This CPU is built in my Commodore C-16 computer from 1984.
 
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Core Frequency:1 MHz
Board Frequency:1 MHz
Data bus (ext.):8 Bit
Address bus:16 Bit
Voltage:5 V
Manufactured:week 47/1984
Made in:Hong Kong
Package Type:Plastic
DIP-40
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MOS 8501R4
MOS 8501R4 Top Side
MOS
8501R4
4986 24
MOS 8501R4 Back Side
HONG KONG
HH452951
410B
This CPU is built in my Commodore Plus/4 computer from 1986.
 
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Core Frequency:1 MHz
Board Frequency:1 MHz
Data bus (ext.):8 Bit
Address bus:16 Bit
Voltage:5 V
Manufactured:week 49/1986
Made in:Hong Kong
Package Type:Plastic
DIP-40
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MOS 8502R0
MOS 8502R0 Top Side
MOS
8502R0
3686
MOS 8502R0 Back Side
HONG KONG
HH193807
HC-10
From my Commodore 128
 
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Core Frequency:2 MHz
Board Frequency:2 MHz
Data bus (ext.):8 Bit
Address bus:16 Bit
Voltage:5 V
Manufactured:week 36/1986
Made in:Hong Kong
Package Type:Plastic
DIP-40
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