history - Why did the Motorola 68000 processor family fall out of …
Sep 25, 2023 · In the '80s and '90s the Intel x86 and Motorola 68000 families were the two leading microcomputer architectures in the 16-bit/32-bit personal computer scene. The 68000s …
m68k - Why are old CPUs like MOS Technology 6502 and …
Oct 17, 2020 · Why are old CPUs like MOS Technology 6502 and Motorola 68000 considered better for real time systems applications than modern x86 based CPUs? Because the persons …
m68k - What do the "byte-select signals" in the 68000 do ...
Wikipedia says: The 68000 has a 24-bit external address bus and two byte-select signals "replaced" A0. Here is an image of the chip's pins: As Wikipedia says, A0 is not there. So …
history - Did IBM originally plan to use the 68000 in the PC ...
Nov 14, 2020 · One of the big turning points in the history of the industry was IBM choosing the Intel 8088 over the Motorola 68000. Given that most people outside IBM considered the 68000 …
68000 and memory access speed - Retrocomputing Stack Exchange
May 13, 2017 · The 4 clock cycles per memory access was for instruction fetch and the 68000 could actually take longer. (Internal Architecture of 68000 was 3 16-bit Arithmetic Logic Units; …
Are there more different ways Motorola 68000 A-line and F-line …
Oct 30, 2024 · Are there more different ways Motorola 68000 A-line and F-line traps were used than the Classic Mac way and the Lisa way? Ask Question Asked 1 year, 1 month ago …
How does states, bus cycles and clock cycles differ in the M68000?
Jul 24, 2019 · When the 68000 changes state, it does so on a clock transition. A clock cycle is one complete cycle of the clock. For an 8Mhz 68000, there are 8,000,000 clock cycles per …
motorola 68000 - What limited the use of the Z8000 (vs. 68K and …
The Zilog Z8000, Motorola 68000, and Intel 8086 all arrived at roughly the same time-frame and each represented the new 16-bit architecture of their respective CPU designers.
cpu - What is the relation between external clock and internal …
Jul 25, 2021 · According to the 68000 bus diagram, there are 4 CPU cycles for a memory cycle, so an external frequency of 8 MHz. However, things are happening on the falling edges of the …
Why does the 68000 have Immediate addressing modes for byte …
Jul 26, 2024 · Motorola's 68000 has an instruction like ori.b #immediate, d0. This particular instruction is encoded as all zeroes, followed by a full 16 bits encoding an 8-bit immediate …