MOS Technology 6510#8501
{{Short description|8-bit microprocessor}}
{{Use mdy dates|date=January 2016}}
{{redirect|6510|the mobile phone|Nokia 6510}}
{{Infobox CPU
|name = MOS Technology 6510
|image = KL MOS 6510.jpg
|caption =
|produced-start =
|produced-end =
|slowest = 0.985 | slow-unit = MHz
|fastest = 1.023 | fast-unit = MHz
|data-width = 8
|address-width = 16
|manuf1 = MOS Technology, Rockwell, Synertek
|arch = MOS 6502
|pack1 = 40-pin DIP
|predecessor = MOS 6502
|successor = MOS 8502
|variant = MOS 8500, 7501/8501, 8502, 6510T
}}
image:MOS Technologies large.jpg. The production week/year (WWYY) of each chip is given below its name.]]
The MOS Technology 6510 is an 8-bit microprocessor designed by MOS Technology. It is a modified form of the very successful 6502. The 6510 is widely used in the Commodore 64 (C64) home computer and its variants. It is also used in the Seagate ST-251 MFM harddisk.[https://github.com/ForgottenMachines/Seagate/blob/main/ST-251/Seagate_ST251_schematic.pdf ST-251 schematic]
The primary change from the 6502 is the addition of an 8-bit general purpose I/O port, although 6 I/O pins are available in the most common version of the 6510. In addition, the address bus can be made tristate and the CPU can be halted cleanly.
Use
In the C64, the extra I/O pins of the processor are used to control the computer's memory map by bank switching, and for controlling three of the four signal lines of the Datasette tape recorder (the electric motor control, key-press sensing and write data lines; the read data line went to another I/O chip). It is possible, by writing the correct bit pattern to the processor at address $01, to completely expose almost the full 64 KB of RAM in the C64, leaving no ROM or I/O hardware exposed except for the processor I/O port itself and its data directional register at address $00.{{cite magazine |url=http://www.atarimagazines.com/compute/issue32/112_1_COMMODORE_64_ARCHITECTURE.php |title=Commodore 64 Architecture |first=Jim|last=Butterfield |magazine=Compute! |date=January 1983 |page=208 |issue=32}}
Variants
= MOS 8500 {{anchor|8500}} =
In 1985, MOS produced the 8500, an HMOS version of the 6510. Other than the process modification, 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.
= MOS 7501/8501 {{anchor|7501|8501}} =
The 7501/8501 variant of the 6510 was introduced in 1984.[http://plus4world.powweb.com/hardware/MOS_75018501 Hardware – MOS 7501/8501] Compared to the 6510, this variant extends the number of I/O port pins from 6 to 8, but omits the pins for non-maskable interrupt and clock output.[https://ist.uwaterloo.ca/~schepers/MJK/7501.html CPU 7501 / 8501] It is used in Commodore's C16, C116 and Plus/4 home computers, where its I/O port controls not only the Datasette but also the CBM Bus interface. The main difference between 7501 and 8501 CPUs is that they were manufactured with slightly different processes: 7501 was manufactured with HMOS-1 and 8501 with HMOS-2.
= MOS 8502 {{anchor|8502}} =
{{mainarticle|MOS Technology 8502}}
The 2 MHz-capable 8502 variant is used in the Commodore 128. All these CPUs are opcode compatible (including undocumented opcodes).{{cite web|url=http://www.oxyron.de/html/opcodes02.html|title=6502/6510/8500/8502 Opcodes|last=Graham|website=www.oxyron.de}}
= MOS 6510T {{anchor|6510T}} =
The Commodore 1551 disk drive (for the Commodore Plus/4) uses the 6510T, a version of the 6510 with eight I/O lines. The NMI and RDY signals are not available.
See also
References
{{Reflist}}
Further reading
{{See also|MOS Technology 6502#Further reading|l1=List of books about 65xx microprocessor families}}
External links
- [http://www.devili.iki.fi/pub/Commodore/docs/datasheets/CSG/6510-8211_rev_a.zip MOS 6510 datasheet (GIF format, zipped)]
- [http://www.6502.org/documents/datasheets/mos/mos_6510_mpu.pdf MOS 6510 datasheet (PDF format)]
- [http://www.6502.org/documents/datasheets/mos/mos_6510_mpu_nov_1982.pdf MOS 6510 datasheet (preliminary, Nov. 1982, PDF format)]
- {{webarchive |url=https://web.archive.org/web/20230227154421/https://twitter.com/Siliconinsid/status/1587897081649397764 |title=Siliconinsider@Twitter - Die shot of MOS Technology 6510 |date=February 27, 2023
}}
- [http://fms.komkon.org/EMUL8/ komkon.org - Computer Emulation Resources] (includes downloadable source code for 6502)
- {{webarchive |url=https://web.archive.org/web/20180728124917/http://www.c64web.com/ |date=July 28, 2018 |title=Web server using a MOS 6510 computer (aka C64) }}
{{MOS CPU}}
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