Due to its simplicity it's a fun little processor to program. Hacking on some assembly on a ZX spectrum emulator is a nice way to stay sane in this high abstraction LLM age.
"Simple" is really not a word I would associate with the Z80 ;)
The ISA is quite messy because of the backward compatibility requirement with the Intel 8080 (e.g. the Z80 had to fill undocumented gaps in the 8080 opcode encoding map with new instructions, four of which were prefix instructions to unlock additional instruction 'subsets' (DD/FD for replacing instructions involving the HL register pair with indexed addressing modes via the IX/IY registers, and ED/CB prefixes for adding two entirely new opcode blocks).
If the Zilog engineers would have been free to design their own ISA I'm sure they would have been able to come up with a much more elegant design.
Also the Z80 had more than twice as many transistors as the 6502 (8500 for the Z80 vs 3500 for 6502).
I still prefer programming the Z80 over the 6502 though :)
I am simplifying a lot since there were much more chips involved... but 3500 transistors to have countless hours of fun to play NES games really puts things into perspective
My 5090 has 92 billion transistors (I dont say they dont bring fun)
> If the Zilog engineers would have been free to design their own ISA I'm sure they would have been able to come up with a much more elegant design.
That's an interesting idea. They were previously part of the team that designed the 8080 so they must have been very familiar with the ISA and the design philosophy.
I'm sure they'd be able to come up with improvements but how much more elegant it would have been is hard to say.
Making it even harder to say: the 8080 was based on the 8008. Even though the 8080 was based on the same instruction set as the 8008, it wasn't binary compatible. I assume that means the instruction encoding was different, which means those engineers probably did as much as the could to clean things up while designing the 8080.
Of course, the 8008's origins (along with the completely unrelated 4004) were outside of Intel. They were hired to design custom ICs. The 8008's architecture was dictated by a CTC terminal. While Intel designed the 4004, it was only intended to be used in calculators. Intel, and its engineers, probably put relatively little thought into microprocessor architecture until the 8080.
I cut my teeth writing assembly on a ZX Spectrum (mostly hacking games for infinite lives, etc).
Over the past couple of years I've gone back to the Z80, working on CP/M emulation, testing, and similar things. It's fun to play the old infocom games, and mess around with BIOSes when all you have is 64k.
There's a lot of good CP/M reference material out there, and numerous emulators to run it on modern systems
My first ambitious project was a Z80 assembler. The Z8000 (much later) was distinguished by being the last random-logic (not microcoded) microprocessor of it's day.
If it wasnt some mostly custom system it was probably an HP 64000 Logic Development System. Which used Z80s to run user facing software and control the actual mainframe. I doubt it was a pure Z80 "mainframe". Loved to be proved wrong though!
Reminded me good old days.. games loaded from cassette recorder and my first program for Spectrum which was a simple drawing tool I proudly called "graphic editor" :)
The 6502 and its variants are still ubiquitous as well, powering millions of toys based on Sunplus/GeneralPlus microcontrollers [1] [2] [3] as well as the vast majority of bootleg game consoles that use variants of "Famiclone" hardware (or occasionally general-purpose 6502 MCUs [4]) to this day. It's fascinating how the toy industry went for the 6502 over the 8051 and PIC12 clones more common in other cheap electronics; I suspect it had to do both with the architecture's better performance (important for tasks such as audio decoding) and with the historical availability of experienced 6502 assembly developers as the game industry moved away from 8-bit platforms.
It's still active as a mask for a more complex system on a single die. Even the support chips are available. The Juno project, orbiting Jupiter, had a Z80 compatible core for the radar signal processing.
At, ballpark, 1000 times the clock frequency. It’s a pity we do not how to connect such a large number of tiny cores in a way so that it can perform meaningful work. One hurdle is that, even ignoring the insane amount of connections needed, it would not be possible to connect each of those cores to each other one because their address spaces are so tiny.
GREAT classic question (with a well-defined answer)
In general, the reason why modern CPUs are so complex is because the gap in performance between CPU and memory has grown massively over time.
In the old days, something like a 6502 was running nearly synchronously with RAM.
That gap has grown massively over time; a modern CPU is orders of magnitude faster than RAM. So they have to jump through a lot of loops to avoid simply idling 99.99% of the time while they wait for some new data or instructions from RAM. On-CPU cache memory is one answer. Branch prediction and speculative execution are others. As you may imagine, speculatively executing code based on branch prediction is very complex because you must roll back any side effects from that execution if your prediction turns out wrong.
Example:
# assume `i` is a value stored in main memory
if i == 42
j += 1
k -= 1
l = 666
else
z = 123
q = 5879873
Waiting for `i` to arrive from main memory might take thousands of CPU cycles. So instead we will execute one, and possibly both of those branches. But we'll need to undo those side effects if turns out we executed something with an invalid prediction. It's complex, and messy, but still better than sitting around doing nothing for thousands of cycles.
That's why we can't just take an R2000 and scale it up to 3ghz. I mean, we could, but it wouldn't work very well unless we also had low-latency 3ghz main memory to pair with it.
Acorn co-founder Hermann Hauser famously joked that he gave the original ARM microchip design team two distinct advantages: no time and no resources. With no money for a large crew or complex hardware, the tiny core team had to keep the processor design exceptionally simple, which ultimately birthed the revolutionary RISC architecture.
It also had to run in simulation on a BBC micro… Probably with a second processor via the Tube interface, but still.
Nitpicking, but since the M5 includes cache and GPU a more realistic comparision would probably be to count all transistors in an entire 8-bit home computer system against a modern integrated GCPU (e.g. from googling around a C64 might have around 0.75 million transistors, most in the memory chips).
And in a way, those old 8-bit home computers also worked like a single integrated 'super-chip', because the whole system was driven by a single clock and entirely 'hard realtime', while modern computers are much more asynchronous (and I guess this asynchronous design is what enabled most performance improvements that go beyond pure transistor count scaling).
Z80 was the choice of a microprocessor for then home computers such as Radio Shack TRS-80, SORD M23P, M5, Sinclair ZX81, ZX Spectrum, KayPro II, and many other manufacturers.3 It was capable of running the CP/M operating system in most Z80-based PCs. Z80 had a reasonable share in the PC market until Intel revealed its 16-bit microprocessor in the mid-1980s. Z80 was very popular as a microprocessor not only in PC applications, but also in industrial embedded applications, and some of the big manufacturers have Z80 core inside their ASIC chips still today or use enhanced versions of Z80 in consumer electronic devices.4–7 Zilog still manufactures ez80, an enhanced version of the original Z80, which is still being used by Texas Instruments in its TI-84 and TI-84 Plus calculators.7 It is among the few silicon chips that made a remarkable impact on the electronic device industry.8 To this day, Zilog produces a range of Z80-based microprocessors and intelligent peripheral controllers, and they are available from reputed electronics component suppliers.2,9,10 This microprocessor is one of the longest living microprocessors of all time.
Rare find https://www.zosya.net/file/TTT_in_detail.pdf - Russian, probably can be translated easily, long story on how one of the games for ZX was made
Tom Jennings, the creator of fidenet, is producing a nice modern Z80 computer[0]
0. https://www.ebay.ie/itm/206496219323
RC2014 is the real deal: https://rc2014.co.uk
Why I have not picked one up yet… I think I just have a sweet spot for the 6502 and keep putting together KIM-1 kits.
(EDIT: Finally after years, I just pulled the trigger on their Classic II kit.)
I don't know -- I'm seeing a lot of corner-cutting in the board designs!
I think they’re a notch above the rest
Nice! This one is also being produced: https://retrogamecoders.com/agon-light-first-impressions/
(emulated)
(on a 600 Mhz Teensy 4.1)
Woah that’s cool! I love the case!
Due to its simplicity it's a fun little processor to program. Hacking on some assembly on a ZX spectrum emulator is a nice way to stay sane in this high abstraction LLM age.
"Simple" is really not a word I would associate with the Z80 ;)
The ISA is quite messy because of the backward compatibility requirement with the Intel 8080 (e.g. the Z80 had to fill undocumented gaps in the 8080 opcode encoding map with new instructions, four of which were prefix instructions to unlock additional instruction 'subsets' (DD/FD for replacing instructions involving the HL register pair with indexed addressing modes via the IX/IY registers, and ED/CB prefixes for adding two entirely new opcode blocks).
If the Zilog engineers would have been free to design their own ISA I'm sure they would have been able to come up with a much more elegant design.
Also the Z80 had more than twice as many transistors as the 6502 (8500 for the Z80 vs 3500 for 6502).
I still prefer programming the Z80 over the 6502 though :)
I am simplifying a lot since there were much more chips involved... but 3500 transistors to have countless hours of fun to play NES games really puts things into perspective
My 5090 has 92 billion transistors (I dont say they dont bring fun)
> If the Zilog engineers would have been free to design their own ISA I'm sure they would have been able to come up with a much more elegant design.
That's an interesting idea. They were previously part of the team that designed the 8080 so they must have been very familiar with the ISA and the design philosophy.
I'm sure they'd be able to come up with improvements but how much more elegant it would have been is hard to say.
Making it even harder to say: the 8080 was based on the 8008. Even though the 8080 was based on the same instruction set as the 8008, it wasn't binary compatible. I assume that means the instruction encoding was different, which means those engineers probably did as much as the could to clean things up while designing the 8080.
Of course, the 8008's origins (along with the completely unrelated 4004) were outside of Intel. They were hired to design custom ICs. The 8008's architecture was dictated by a CTC terminal. While Intel designed the 4004, it was only intended to be used in calculators. Intel, and its engineers, probably put relatively little thought into microprocessor architecture until the 8080.
They did eventually design their own clean-sheet instruction set for Z8000.
> If the Zilog engineers would have been free to design their own ISA I'm sure they would have been able to come up with a much more elegant design.
Since Zilog was founded by former Intel engineers, they were probably the ones who helped design the 8080 in the first place?
I cut my teeth writing assembly on a ZX Spectrum (mostly hacking games for infinite lives, etc).
Over the past couple of years I've gone back to the Z80, working on CP/M emulation, testing, and similar things. It's fun to play the old infocom games, and mess around with BIOSes when all you have is 64k.
There's a lot of good CP/M reference material out there, and numerous emulators to run it on modern systems
My first ambitious project was a Z80 assembler. The Z8000 (much later) was distinguished by being the last random-logic (not microcoded) microprocessor of it's day.
> Then, as a young engineer, I worked in a large mainframe computer system based on Z80.
This sentence threw me a little bit. Which mainframes were based on the Z80? I'd love to know more about that.
If it wasnt some mostly custom system it was probably an HP 64000 Logic Development System. Which used Z80s to run user facing software and control the actual mainframe. I doubt it was a pure Z80 "mainframe". Loved to be proved wrong though!
Reminded me good old days.. games loaded from cassette recorder and my first program for Spectrum which was a simple drawing tool I proudly called "graphic editor" :)
Ironically (and sadly) the Z80 was discontinued not very long after this piece was published.
IIRC, only the classic 40-pin DIP Z80 was discontinued. The eZ80, which is fully compatible, is still in production.
We still have the venerable 8051 for anyone who likes old architectures!!
The 6502 and its variants are still ubiquitous as well, powering millions of toys based on Sunplus/GeneralPlus microcontrollers [1] [2] [3] as well as the vast majority of bootleg game consoles that use variants of "Famiclone" hardware (or occasionally general-purpose 6502 MCUs [4]) to this day. It's fascinating how the toy industry went for the 6502 over the 8051 and PIC12 clones more common in other cheap electronics; I suspect it had to do both with the architecture's better performance (important for tasks such as audio decoding) and with the historical availability of experienced 6502 assembly developers as the game industry moved away from 8-bit platforms.
[1] https://spritesmods.com/?art=tamasingularity&page=2
[2] https://archive.org/details/furby-source
[3] https://dmitry.gr/?r=05.Projects&proj=37.%20Pixter#_TOC_a6fe...
[4] https://github.com/davidgiven/tony-sdk
I'm sure clones are still being made.
It's still active as a mask for a more complex system on a single die. Even the support chips are available. The Juno project, orbiting Jupiter, had a Z80 compatible core for the radar signal processing.
The cpu possibly, but I had a hard time trying to find the support chips (ctc, sio/pio, etc)...
Many applications didn't even use those peripherals so I suppose production ended earlier.
The Z80 could even refresh the RAM by itself. It was not like the 8080 which required two support chips only to function.
Do you have an actual use for them? I might have a few tubes of Z80-CTC & SIO in the basement if I haven't given them all away yet.
Interesting interview with Frederico Faggin on of the two designers of the z80 https://m.youtube.com/watch?v=28JtL1WVjMw
interesting to be reminded that an 8080 (8 bit datapath) took 4,800 transistors
an Apple M5 Max is 100,000,000,000 transistors (ok it’s 18 CPU + 40 GPU cores) by comparison so 17 million 8080 equivalents
> so 17 million 8080 equivalents
At, ballpark, 1000 times the clock frequency. It’s a pity we do not how to connect such a large number of tiny cores in a way so that it can perform meaningful work. One hurdle is that, even ignoring the insane amount of connections needed, it would not be possible to connect each of those cores to each other one because their address spaces are so tiny.
Cerebras built the wafer scale engine so I'm not sure what you're pitying.
> It’s a pity we do not how to connect such a large number of tiny cores in a way so that it can perform meaningful work
Every so often someone reinvents the transputer, and it turns out not to be quite as good as mainstream multi-core CPUs, but the wheel must turn.
yeah, i have the notion that a grid would be good enough
The ARM 1 only had 25,000 or so.
wonders how ARM did that - the MIPS R2000 came in at ~115k and the 80286 ~134k
anyway - say you want 50% of the transistors for on chip RAM these days, then thats
100 billion / 50 thousand = 2 million ARM 1s
clocking at say 3GHz
6e15 MIPS = 6 peta MIPS
so if you could run code on it, you would get a 10,000x speed up ;-)
GREAT classic question (with a well-defined answer)
In general, the reason why modern CPUs are so complex is because the gap in performance between CPU and memory has grown massively over time.
In the old days, something like a 6502 was running nearly synchronously with RAM.
That gap has grown massively over time; a modern CPU is orders of magnitude faster than RAM. So they have to jump through a lot of loops to avoid simply idling 99.99% of the time while they wait for some new data or instructions from RAM. On-CPU cache memory is one answer. Branch prediction and speculative execution are others. As you may imagine, speculatively executing code based on branch prediction is very complex because you must roll back any side effects from that execution if your prediction turns out wrong.
Example:
Waiting for `i` to arrive from main memory might take thousands of CPU cycles. So instead we will execute one, and possibly both of those branches. But we'll need to undo those side effects if turns out we executed something with an invalid prediction. It's complex, and messy, but still better than sitting around doing nothing for thousands of cycles.That's why we can't just take an R2000 and scale it up to 3ghz. I mean, we could, but it wouldn't work very well unless we also had low-latency 3ghz main memory to pair with it.
> wonders how ARM did that
Acorn co-founder Hermann Hauser famously joked that he gave the original ARM microchip design team two distinct advantages: no time and no resources. With no money for a large crew or complex hardware, the tiny core team had to keep the processor design exceptionally simple, which ultimately birthed the revolutionary RISC architecture.
It also had to run in simulation on a BBC micro… Probably with a second processor via the Tube interface, but still.
A fairly deep dive into it
https://www.righto.com/2015/12/reverse-engineering-arm1-ance...
ARM1 has no cache memory, no hardware multiply and division, no MMU and no cache.
Yeah — even ARM2 has no divide, as far as I recall from my days with an A310.
This is understandable, considering that the M5 is the Ultimate Computer, powered by Dr. Richard Daystrom's very own engrams
But the M5 is clearly not safe to use in Enterprise¹ computing environments.
¹ USS Enterprise, that is.
excellent point
Yup and Moore's law about transistors doubling every 18 to 24 months did basically hold, which is even more impressive.
Foreseen it was.
Nitpicking, but since the M5 includes cache and GPU a more realistic comparision would probably be to count all transistors in an entire 8-bit home computer system against a modern integrated GCPU (e.g. from googling around a C64 might have around 0.75 million transistors, most in the memory chips).
And in a way, those old 8-bit home computers also worked like a single integrated 'super-chip', because the whole system was driven by a single clock and entirely 'hard realtime', while modern computers are much more asynchronous (and I guess this asynchronous design is what enabled most performance improvements that go beyond pure transistor count scaling).
The inventor of the Z80 Fredrico Faggin is promoting a consciousness first universe now
https://youtu.be/-vz5LU2ECm0?is=g1T-QM8Lq9qNyiNK
I read his book, honestly I think he's right.
A paragrap from the linked articale
Z80 was the choice of a microprocessor for then home computers such as Radio Shack TRS-80, SORD M23P, M5, Sinclair ZX81, ZX Spectrum, KayPro II, and many other manufacturers.3 It was capable of running the CP/M operating system in most Z80-based PCs. Z80 had a reasonable share in the PC market until Intel revealed its 16-bit microprocessor in the mid-1980s. Z80 was very popular as a microprocessor not only in PC applications, but also in industrial embedded applications, and some of the big manufacturers have Z80 core inside their ASIC chips still today or use enhanced versions of Z80 in consumer electronic devices.4–7 Zilog still manufactures ez80, an enhanced version of the original Z80, which is still being used by Texas Instruments in its TI-84 and TI-84 Plus calculators.7 It is among the few silicon chips that made a remarkable impact on the electronic device industry.8 To this day, Zilog produces a range of Z80-based microprocessors and intelligent peripheral controllers, and they are available from reputed electronics component suppliers.2,9,10 This microprocessor is one of the longest living microprocessors of all time.
Z80 also powered the whole MSX line of home computers, how could have he missed that?!?
Also mentioned the KayPro II but omitted the Osborne 1.
Slop from the article