How much memory can a 68000 address?
How much memory can a 68000 address?
The 68000 has a 24-bit external address bus and two byte-select signals “replaced” A0. These 24 lines can therefore address 16 MB of physical memory with byte resolution. Address storage and computation uses 32 bits internally; however, the 8 high-order address bits are ignored due to the physical lack of device pins.
Is the Motorola 68000 still made?
Yes. They’re known as ColdFire processors now, and they’re sold by NXP. Coldfire is a rather different product, though. The instruction set is similar but not identical, and there’s no exposed memory bus.
Who introduced the 68000 microprocessor?
Motorola
Motorola 68000 series
| Designer | Motorola |
| Bits | 32-bit |
| Introduced | 1979 |
| Design | CISC |
| Registers |
|---|
How many data pins for a Motorola 68K has?
The 68000 has 64 pins which may be grouped together as shown in Figure 1.
What is the 68000 processor addressing modes?
Table of addressing modes¶
| Name | Syntax | EA Mode |
|---|---|---|
| Address Register Indirect with Index | (d8,Dn,An) | 110 |
| Absolute Short Data | .w | 111 |
| Absolute Long Data | .l | 111 |
| Program Counter Relative with Displacement | (d16,PC) / d16(PC) | 111 |
What was the Motorola 68000 used in?
The Motorola 68000, also referred to as the 68000 or 68k, is a 16/32-bit CISC processor that was produced by Motorola’s Semiconductor Products Sector. The 68000 was used in the Apple Lisa and early models of Amiga, Atari ST, and Macintosh computers.
How many transistors does the Motorola 68000 have?
Microprocessors
| Processor | MOS transistor count | Designer |
|---|---|---|
| Motorola 68000 (16/32-bit, 32-bit registers, 16-bit ALU) | 68,000 | Motorola |
| Intel 8051 (8-bit, 40-pin) | 50,000 | Intel |
| WDC 65C02 | 11,500 | WDC |
| ROMP (32-bit) | 45,000 | IBM |
How many interrupt pins does the 68k have?
256
In 68k there are 256 such interrupt vectors.
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.
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.
What is easy 68K?
EASy68K is a 68000 Structured Assembly Language IDE. EASy68K allows you to edit, assemble and run 68000 programs on a Windows PC or Wine. No additional hardware is required. EASy68K is an open source project distributed under the GNU general public use license.
