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Z80 or 6502?

And no copping out by saying you prefer the 6809. Everyone prefers the 6809.


8080, of course


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Gonna jump forward in history a bit and pick the first ARM in the Acorn Archimedes, made and designed in Britain.


Okay, so that would be Z80 then. It's binary-compatible with the 8080, but with some extra features.


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It was more of cultural choice, of course, though Z80 is superior to 6502 in one detail - it can move stack pointer to any address in memory, which 6502 could not do.

In any case, I respect them all and would want to have each machine in my collection. Hopefully, one day I will have £££ to purchase them.


The machines are expensive, but if you've got a serial terminal, you can wire up a storage-less SBC fairly cheaply, and even build a micro, if you're good. http://searle.hostei.com/grant/ has some schematics for simple ones, if you can't be bothered to draw up your own (it also has a design that allegedly can run CP/M off a CF card). It even has some instructions for building your own micros (ZX80, Jupiter Ace, and part of the UK101).

But I'm mostly building single-board stuff, because I suck, and I want to play with assembler without an OS, and it seemed like a fun way to do that.

My one problem is the 6809: it's back in production (thank you Rochester Electronics), but you can't actually buy them, AFAIK.


At least the 6502 is still being sold by the Western Design Center.


Ditto for the Z80 and Zilog: The 6809 is the only one you can't buy.


Motorola stuff just seems harder to find in general.

I don't think they even sell 68000's anymore, and that's one of their most famous processors.


They still make 68000 processors, but they aren't pin compatible with the old ones.


Oh, so they don't make DIP ones anymore? Kind of a shame.


They might, but I didn't see any when narrowed down by what doesn't require a significant order due to not normally being stocked.


I've actually got an Osborne 1 laying around, so Z80 all the way


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what are some good 386/486 desktops or laptop from the 90s?

bonus for aesthetics and chipset documentation


A friend just sent me a z80 alongside some sram, eeprom, and a few other goodies. Looks like i'm building a z80 machine soon then. I haven never touched any of this though so i have a lot of learning to do, starting with the z80 instruction set.


That picture is of a Sun Ultra 80, which is NOT x86, but SPARC.


I chose the 6502 for my SBC because it has the most active online community.


So i'm starting to try and build my own system with a z80, and i'm a bit confused on starting it. I have some sram that i plan to use for hte memory, but i want to be able to use an eeprom to load programs onto the machine. I'm going to make my own assembler/programmer with a uc but i don't know how to go about boot loading. Should i have it start reading from the eeprom then hand the address bus to the memory after? should i try to get everything copied to memory? I'm not sure what to do or how to do it, a lot of this hardware level stuff is unfamiliar to me. I'm trying to understand the pinout of the z80 right now and what each pin is used for (I know the obvious ones like address and data pins)


z80 most fun to program

it's a beautiful mess; have fun implementing an optimised multiplication alg ^_^