The 6800 is an 8-bit microprocessor produced by Motorola and released shortly after the Intel 8080 in late 1974.It had 78 instructions, including the (in)famous, undocumented Halt and Catch Fire (HCF) bus test instruction.It may have been the first microprocessor with an index register.
It was usually packaged in a 40 pin DIP (dual-inline package).
Several first-generation microcomputers of the 1970s, available by mail order as kits or in assembled form, used the 6800 as their CPU; examples are the MEK6800D2 development board, the SWTPC 6800 (the first computer to use the 6800), the MITS Altair 680 range (MITS offered these as alternatives to its Altair 8800 which used the Intel 8080), several of the Ohio Scientific designs, Gimix, Smoke Signal Broadcasting, Midwest Scientific, and the Newbear 77/68.
The 4051, a professional grade desktop graphical system intended for user programming in BASIC, was manufactured and sold by Tektronix. This integrated a 6800 processor, memory card, storage display tube, keyboard, and magnetic tape cassette in a single unit and employed an external thermal imaging printer for hard copy.
The 6800 'fathered' several descendants, the pinnacle being the greatly extended and semi-compatible 6809, which was used in the Vectrex video game console and the TRS-80 Color Computer, among several others. There are also many microcontrollers descended from the 6800 architecture, such as the Motorola 6801/6803, 6805, RS08, 68HC08, 68HC11 and 68HC12.
Hitachi, Ltd. acted as a second source for many of Motorola's CPUs, and also produced its own derivatives including the 6301 and 6303, which could run 6800 code. These microprocessors also had a couple of extra instructions added to their instruction sets.
Competitor MOS Technology came up with an architectural relative of the 6800, with its 6502 ('lawsuit compatible' MPU) and its successors. The 6502 did not have the 16 bit registers of the 6800, but had more addressing modes and was substantially cheaper. The 6502 was used in many computers and game consoles during the late 1970s and early-to-mid-1980s (most notably the Atari 2600, Apple II, the Commodore PET, VIC-20 and Commodore 64, the Acorn Electron/BBC Microcomputer, and the Nintendo Entertainment System/NES).
The 6800 was supplanted by the Motorola 68000, used in large numbers in the Apple Macintosh family before the introduction of the PowerPC, a RISC technology developed by IBM and produced jointly with Motorola
It was usually packaged in a 40 pin DIP (dual-inline package).
Several first-generation microcomputers of the 1970s, available by mail order as kits or in assembled form, used the 6800 as their CPU; examples are the MEK6800D2 development board, the SWTPC 6800 (the first computer to use the 6800), the MITS Altair 680 range (MITS offered these as alternatives to its Altair 8800 which used the Intel 8080), several of the Ohio Scientific designs, Gimix, Smoke Signal Broadcasting, Midwest Scientific, and the Newbear 77/68.
The 4051, a professional grade desktop graphical system intended for user programming in BASIC, was manufactured and sold by Tektronix. This integrated a 6800 processor, memory card, storage display tube, keyboard, and magnetic tape cassette in a single unit and employed an external thermal imaging printer for hard copy.
The 6800 'fathered' several descendants, the pinnacle being the greatly extended and semi-compatible 6809, which was used in the Vectrex video game console and the TRS-80 Color Computer, among several others. There are also many microcontrollers descended from the 6800 architecture, such as the Motorola 6801/6803, 6805, RS08, 68HC08, 68HC11 and 68HC12.
Hitachi, Ltd. acted as a second source for many of Motorola's CPUs, and also produced its own derivatives including the 6301 and 6303, which could run 6800 code. These microprocessors also had a couple of extra instructions added to their instruction sets.
Competitor MOS Technology came up with an architectural relative of the 6800, with its 6502 ('lawsuit compatible' MPU) and its successors. The 6502 did not have the 16 bit registers of the 6800, but had more addressing modes and was substantially cheaper. The 6502 was used in many computers and game consoles during the late 1970s and early-to-mid-1980s (most notably the Atari 2600, Apple II, the Commodore PET, VIC-20 and Commodore 64, the Acorn Electron/BBC Microcomputer, and the Nintendo Entertainment System/NES).
The 6800 was supplanted by the Motorola 68000, used in large numbers in the Apple Macintosh family before the introduction of the PowerPC, a RISC technology developed by IBM and produced jointly with Motorola
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