DMA Controller in 8085 microprocessor?

Question

How can i Intereface a DMA Controller in a 8085 microprocessor, for transfering data from a floppy disk? PLease help me with the code.. Thanks a ton..

Answer 1

Ah Chris, quit building recievers! just kidding. I agree with him

Answer 2

The Intel 8085 was an 8-bit microprocessor made by Intel in the mid-1970s. It was binary compatible with the more-famous Intel 8080 but required less supporting hardware, thus allowing simpler and less expensive microcomputer systems to be built.

There are no known DMA controllers for this processor and no floppy disk drives were used with it.
Think about it, floppy drives in the 1970's, the 3½-inch
single sided didnt come out till 1982, before that were 51/4" & 8". DMA, as is normally used with the ISA bus, the transfer is performed by a DMA controller which is typically part of the motherboard chipset. ISA originated as an 8-bit system in the IBM PC in 1981

Check for yourself>>
http://en.wikipedia.org/wiki/8085

Answer 3

Dma In Microprocessor

Answer 4

As I said the other time you asked this, the 8085 supports an external DMA controller with the HOLD and HLDA lines, when HOLD is asserted the processor finishes the current instruction then stops and asserts HLDA. When the transfer is complete the DMA controller removes HOLD and the processor removes HLDA and continues where it left off.

It is arrogant and foolish to assert that the 8085 was never used with a floppy controller, I used one with a fiber optic link and a lot of purpose built hardware I'll never be at liberty to talk about. The SOS version of the processor was radiation hard...