How much memory can a 68000 address?
Table of Contents
How much memory can a 68000 address?
4 gigabytes
As you know, the 68000 has a 32 bit Program Counter and 32 bit address registers. This is so because addresses of locations in memory are 32 bit numbers, and consequently you can address up to 232 locations, i.e. 232 bytes, or 4 gigabytes (each memory location is one byte).
Is 68000 still used?
After 43 years in production, the 68000 architecture is still in use.
What do you mean by Motorola 68000 explain their mode of operation and addressing mode in brief?
This addressing mode is another of the high-level languages constructs that the MC68000 provides directly in its Assembly language. This mode works exactly like the Address Register Indirect, but after the data has been fetched from memory the address register is incremented by the size of the data itself.
How many classes of registers does the 68000 have *?
The 68000 register structure, has 8 data registers and 8 address registers, each 32 bit long.
Does Motorola still make microprocessors?
Although no modern desktop computers are based on processors in the 680×0 series, derivative processors are still widely used in embedded systems….Motorola 68000 series.
| Bits | 32-bit |
| Introduced | 1979 |
| Design | CISC |
| Branching | Condition code |
| Registers |
|---|
Where are Motorola chips made?
In 2000, Motorola owned 18 wafer fabs. By this month, it will have just 8. At present, 30% of its chip revenue comes from products made, tested, or assembled by Taiwan Semiconductor Manufacturing Co.
What happens if the Motorola 68000 attempts to perform a word access or long word access to an odd memory address explain?
This processor will not work if the words or long words are not aligned. If we tried to transfer a word to odd address, then one byte will be in one word address. But the other half will be in a different word address. This is why the 68000 processor doesn’t have the A0 pin.
How many registers does the 68k have?
Motorola 68000 series
| Design | CISC |
| Branching | Condition code |
| Endianness | Big |
| Registers | |
|---|---|
| 8 × 32-bit data registers 7 × 32-bit address registers stack pointer (address register 7) 8 × 80-bit floating-point registers if FP present |
How is 8086 1 MB memory?
The number of address lines in 8086 is 20, 8086 BIU will send 20bit address, so as to access one of the 1MB memory locations. The four segment registers actually contain the upper 16 bits of the starting addresses of the four memory segments of 64 KB each with which the 8086 is working at that instant of time.
How do you calculate overflow flag?
1. If the sum of two numbers with the sign bits off yields a result number with the sign bit on, the “overflow” flag is turned on. 2. If the sum of two numbers with the sign bits on yields a result number with the sign bit off, the “overflow” flag is turned on.
Who defeated Motorola?
How did Motorola grow to become one of the biggest companies in the world, and at one point hold a dominant market share? In a word: hardware. And how did Motorola lose it, and end up with the major part of the company bought by Google? In a word: software.
Which of the following is a core processor of Motorola 68000 family?
Which of the following is a coprocessor of Motorola 68000 family? Explanation: The 68881 coprocessor of Motorola provides floating point arithmetics.
Does Motorola still make cpus?
Although no modern desktop computers are based on processors in the 680×0 series, derivative processors are still widely used in embedded systems….Motorola 68000 series.
| Designer | Motorola |
| Bits | 32-bit |
| Introduced | 1979 |
| Design | CISC |
| Registers |
|---|
Is carry and overflow same?
In processors, overflow flag indicates that sign bit has been changed during adding or subtracting operations But carry flag means adding or subtracting two registers has carry or borrow bit.
