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Pro-Log Corp. put the 8085 and supporting hardware on an STD Bus format card containing CPU, RAM, sockets for ROM/EPROM, I/O and external bus interfaces. The included Instruction Set Reference Card uses entirely different mnemonics for the Intel 8085 CPU. The product was a direct competitor to Intel's Multibus card offerings. Intel 8085 second ...
Intel produced a CMOS 8085 (80C85) ... Furthermore, direct 16-bit copying between HL and memory was now possible, using a direct address.
Store to memory using Direct Store (memory store that is not cached or write-combined with other stores). 3 Tiger Lake, Tremont, Zen 5: MOVDIR64B Move 64 bytes as Direct Store. MOVDIR64B reg,m512: 66 0F 38 F8 /r: Move 64 bytes of data from m512 to address given by ES:reg. The 64-byte write is done atomically with Direct Store. [ai] 3 Tiger Lake ...
Indirect addressing does carry a performance penalty due to the extra memory access involved. Some early minicomputers (e.g. DEC PDP-8, Data General Nova) had only a few registers and only a limited direct addressing range (8 bits). Hence the use of memory indirect addressing was almost the only way of referring to any significant amount of memory.
Direct address: ADD.A address 1 — add the value stored at address 1; Memory indirect: ADD.M address 1 — read the value in address 1, use that value as another address and add that value; Many ISAs also have registers that can be used for addressing as well as math tasks. This can be used in a one-address format if a single address register ...
I/O addressing can also sometimes employ the fact that the processor outputs the same 8-bit port address to both the lower and the higher address byte (i.e., IN 05h would put the address 0505h on the 16-bit address bus). Similar I/O-port schemes are used in the backward-compatible Zilog Z80 and Intel 8085, and the closely related x86 ...
Real mode is characterized by a 20-bit segmented memory address space (giving 1 MB of addressable memory) and unlimited direct software access to all addressable memory, I/O addresses and peripheral hardware. Real mode provides no support for memory protection, multitasking, or code privilege levels.
In cases where an original 8237s or direct compatibles were still used, transfer to or from these devices may still be limited to the first 16 MB of main RAM regardless of the system's actual address space or amount of installed memory. Each DMA channel has a 16-bit address register and a 16-bit count register associated with it.
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