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mc6809
(foldoc) | Motorola 6809
6809
MC6809
(MC6809) An eight-bit microprocessor from {Motorola,
Inc.}.
The 6809 was a major advance over both its predecessor, the
Motorola 6800 and the 6502. The 6809 had two 8-bit
accumulators, rather than one in the 6502, and could combine
them into a single 16-bit register. It also featured two {index
registers} and two stack pointers, which allowed for some very
advanced addressing modes. The 6809 was source compatible
with the 6800, even though the 6800 had 78 instructions and the
6809 only had around 59 (including a SEX instruction). Some
instructions were replaced by more general ones which the
assembler would translate and some were replaced by {addressing
modes}.
The 6809 had one of the first multiplication instructions of the
time, 16-bit arithmetic and a special fast interrupt. But it
was also highly optimised, gaining up to five times the speed of
the 6800 series CPU. Like the 6800, it included the undocumented
HCF (Halt and Catch Fire) bus test instruction.
The Hitachi 6309 was a version with extra registers. The
6809 was used in the UK "Dragon 32" personal computer and
was followed by the Motorola 68000.
Usenet newsgroup: news:comp.sys.m6809.
Lennart Benschop posted a
emulator (originally called "usim") and a cross-assembler to
Usenet newsgroup alt.sources on 1993-11-03. Ray P. Bellis
released a version 0.11.
Benschop emulator (http://lennartb.home.xs4all.nl/m6809.html).
(2014-06-24)
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motorola 6809
(foldoc) | Motorola 6809
6809
MC6809
(MC6809) An eight-bit microprocessor from {Motorola,
Inc.}.
The 6809 was a major advance over both its predecessor, the
Motorola 6800 and the 6502. The 6809 had two 8-bit
accumulators, rather than one in the 6502, and could combine
them into a single 16-bit register. It also featured two {index
registers} and two stack pointers, which allowed for some very
advanced addressing modes. The 6809 was source compatible
with the 6800, even though the 6800 had 78 instructions and the
6809 only had around 59 (including a SEX instruction). Some
instructions were replaced by more general ones which the
assembler would translate and some were replaced by {addressing
modes}.
The 6809 had one of the first multiplication instructions of the
time, 16-bit arithmetic and a special fast interrupt. But it
was also highly optimised, gaining up to five times the speed of
the 6800 series CPU. Like the 6800, it included the undocumented
HCF (Halt and Catch Fire) bus test instruction.
The Hitachi 6309 was a version with extra registers. The
6809 was used in the UK "Dragon 32" personal computer and
was followed by the Motorola 68000.
Usenet newsgroup: news:comp.sys.m6809.
Lennart Benschop posted a
emulator (originally called "usim") and a cross-assembler to
Usenet newsgroup alt.sources on 1993-11-03. Ray P. Bellis
released a version 0.11.
Benschop emulator (http://lennartb.home.xs4all.nl/m6809.html).
(2014-06-24)
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