How did the Z80 instruction set differ from the 8080?
2016年10月26日 · The Zilog Z80 microprocessor, known for its use in the ZX Spectrum, was designed to be a backwards-compatible extension to the Intel 8080 processor. It introduced …
Why did the Z80 with 4-bit ALU out-perform the fully 8-bit Intel …
2020年2月16日 · Looking at the development and architecture of the Z80, it appears to be a scaled-down, cost-reduced (in terms of total system cost), clone of the Intel 8080. It only used …
Comparing raw performance of the Z80 and the 6502
2022年5月21日 · It is said the Z80 has a typical 4 clock ticks per instruction, while the 6502 has typically 1 clock tick per instruction and a rudimentary pipeline. It is said the Z80 ALU …
z80 - What is R register and DRAM refresh internal operation ...
2024年4月14日 · The Z80 CPU has a built-in feature to support refreshing DRAM memory, by keeping a 7-bit refresh counter in the register R. The refresh counter is increased by 1 after …
How does the Z80 determine which peripheral sent an interrupt?
2019年3月30日 · extra pins every Z80-world compatible peripheral has to have. extra intelligence every such a peripheral has to have: particularly, they have to understand specific Z80 …
z80 - How did 8 bit processors perform 16 bit arithmetic ...
2018年6月5日 · The Z80 includes two ALUs: a 4-bit general-purpose one, and a 16-bit increment/decrement circuit. Having recently found out about that, I find myself curious how …
z80 - How do I Interface a PS/2 Keyboard without Modern …
2019年3月21日 · A Z80 with a PIO can do everything (*1) a separate system can do. In this case it needs 4 port bits. Two for receiving data/clock from the keyboard/mouse, two to overwrite …
Fastest non-emulated CP/M Z80-based computer ever built?
2017年11月24日 · Back in 1995, I used to work on satellite on-board-systems that were typically powered by a number of 1MHz Z80 forming what you would today call a multi-core CPU. The …
How do Z80 Block Transfer instructions work? - coco
2018年1月12日 · Comparing Z80 with 6809 we should take into account difference in first production date which leads to technology difference (feature size) and thus to difference in …
How costly is it to put things on the stack with the Z80?
2018年11月5日 · Putting automatic objects on the stack is a horribly inefficient way of handling them on the 8080 and Z80 unless it is necessary to support recursion or reentrancy. Copying …