If you do a RV32I core i would heavily recommend including at the very least the Compressed Instructions extension.
As it adds a few 16-bit versions of existing full sized 32-bit instructions, which helps with instruction throughput as you then only need to fetch half as many bytes.
The ...

The idea
For quite some time I've been obsessed with something I'd call a "modern retro computer" (and I'm sure many of you are too). The "retro" in this name mostly refers to the low complexity of a system, meaning something that can be built and programmed from scratch by an individual – as in ...

One thing we didn't discuss in this thread is voltage. According to the datasheet of W65C816 - going faster than 8MHz requires 5V, but I remember I read about some successful implementations of 14MHz SBCs running with 3.3V.
What's your experience on the field?

Thank you, Barry. Luckily I found it on ebay - and it's already on the way to me

Below my quick comments/questions related to few different posts from this thread. Btw - it looks like my poll definitely misses 6800/6809, as these architectures were mentioned number of times here.

The story


> I bought a book about 35 years ago that sampled several different 16-bit ...

Thank you for all comments, very good hints there. Below are my comments regarding some of the "official" boards mentioned earlier.

I was under the impression that the Foenix ran at 14Mhz -however it uses FPGAs ...
As far as I know Foenix (256K) run at 6.29MHz and uses standard W65C02 or W65C816 ...

It looks like all commercialy available 6502/65816 SBCs, like Commander X16 , Foenix or even those offered directly by WDC ( W65C816SXB ) are clocked at 8MHz or less, as if there was some hard limit. On the other hand there are reports on this Forum of SBCs running at 14MHz or even more - without ...

(...) Assembly language of any kind is inherently unfriendly—after all, it has no real resemblance to a human language. At least in C or FORTRAN, recognizable words are used. LDA or ROL ...what the heck is that? :D
Well, I'd argue the same applies to *nix/POSIX commands (what's slrn ?) yet... what ...

Ok, so it arrived. Will let you know after weekend whether it actually works
I know it does very little and is a small project, but as it;s my first PCB, the satisfaction is great. Or... well - there will be when I see it actually working.

And of course my own 65020 is a delight. I'm enjoying it a lot. But I am a little biased there.
I'm sorry it's not on the list and I absolutely understand your preference. Funny enough what made me to start this thread was actually my experimentation with a hypotetical instruction set that would ...

I've just noticed it's exactly two years since your initial post on 65020, which, btw, is a great project and - as mentioned in some comments - an actual implementation of what some here thought about, but never managed to go with as far as you. Have you been working on it recently and - if so ...

RISC-V I found to be the easiest. Actually all the RISCs were relatively easy althogh ARM has changed a little since I first wrote code in the beginning to what it is today.
Sparc has their interesting register window thing, i860 is a nightmare if you want to do floating point. Transputer is like ...

Let me start with my personal experience. I probably spent most of my time coding ASM manually on 68000 (Amiga) and, before that, on 6502 (C16, C64). It was way before I gained any decent knowledge in software engineering, so my approach was rather ugly (lots of dissassembling of existing code ...

Dear All.

As in the topic, I would like to start a discussion on various instruction sets/architectures, that - in your opinion - are the most suitable for writting Assembly code manually.

Just for fun I've created a poll on that topic, although, considering the name of this forum, the winner is ...

Hello, I just joined in :) Here are some my thoughts: (...)
It's never too late and thanks so much for sharing your thoughts, Gilhad :-) I've made some final adjustments after all the comments (including yours) and ordered a PCB for the entire $25(from JLPCB) including taxes and postage. Will let ...