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Programming the 1802 is a pleasure. It's an early RISC design, but I think you got that with the 4 bits wrong. I can't think of any usable set of instructions that used only four data bits and has the others pulled up or down to a constant value.

Could it be that it used only a 8 bit address bus? The 1802 mutiplexed its address lines and small computers (including the original Elf) omitted the latch for the upper address bits and used only the lower address bits with a 256 byte RAM. That's also why my old computer has three different latches for the upper address bits on various expansion boards.

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

The ROM was 8 bits wide, the RAM was definitely only 4 bits wide - it was a 2114

That explains it then. The actual program was in the ROM and the RAM was only used to save some (obviously) 4 bit values. This may be a little awkward, but it would not be hard to do. The better question would be, wether or not the savings were worth the trouble.

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

Exactly so. I made one or two small changes to the code once it was in production, but didn't really get involved with the software until our next desktop calculator which was mains powered and ran completely on an 8088 (later a V20).

But I(we) digress Laugh | :laugh:

Firmly on my list of things to try!

I wanna be a eunuchs developer! Pass me a bread knife!

The old 4164 DRAM has 64 kilobits, so it must be an array of 256 x 256 bits. Not exactly high resolution, but the DRAM should be easy to get. Please don't use the ones in my old Ataris and C64s. Smile | :)

you did see this link?[^]

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

CDP1802 wrote:
you did see this link?[^]

Looks like the kind of info I want -- but it also looks like it would take me a year and a half to read it!

I wanna be a eunuchs developer! Pass me a bread knife!

Oooops. I have learned to switch between languages instantly, at least between those I know.

This[^] will not be poetry, but it should do the trick.

How are you going to open the IC without breaking or contaminating the chip?

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

CDP1802 wrote:
How are you going to open the IC

One way : Part II: How to «open» microchip and what's inside? Z80, Multiclet, MSP430, PIC and more : ZeptoBars[^]

The fuming sulphuric acid is itself an interesting substance: Oleum - Wikipedia[^]

Peter Wasser

"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts." - Bertrand Russell

Thanks. And here[^] they have my favorite little processor under the microscope.

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

CDP1802 wrote:
How are you going to open the IC without breaking or contaminating the chip?

Carefully[^]

I wanna be a eunuchs developer! Pass me a bread knife!

I, CDP1802, first of my name, sentence you...[^]

The language is JavaScript. that of Mordor, which I will not utter here

This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.

"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."

If software development were a circus, we would all be the clowns.

Amazing stuff

New version: WinHeist Version 2.2.2 Beta
I told my psychiatrist that I was hearing voices in my head. He said you don't have a psychiatrist!

Takes me back to 1980's electronics magazine projects.

Haven't logged in for over 6 years. Thanks to all posting on my timeline, all from here. Won't be replying cause I don't know my password.

Michael Martin
Australia

"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible."
- Mr.Prakash One Fine Saturday. 24/04/2004

Michael Martin wrote:
Won't be replying cause I don't know my password.

[Note to self: remove farcebook password from the password manager]

Thanks for the great tip!

I wanna be a eunuchs developer! Pass me a bread knife!

So you think you're special eh? I haven't logged in in 52 years. Never had a password!

... such stuff as dreams are made on

Oh it seems that I am also immune, but this brings a good question - how many people do not use FB ?

I'll open an account over Z's dead body.

Actually probably not then either, but as long as he's breathing there's not a chance. Everything that man touches turns into an invasion of privacy.

Dead | X|

Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius

Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt

When it first started, I wanted to take a look -- and I've regretted it, ever since.

I wanna be a eunuchs developer! Pass me a bread knife!

same for me...

at the very beginning was a cool idea, but I pretty fast got disappointed and started to log less and less... right now I only do one log per year to keep the settings to the most restrictive I can find.

M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.

Tachyonx wrote:
how many people do not use FB

The teenagers seem to not use it at all. They consider it a platform for the uncool old people.

utf8-cpp

Tachyonx wrote:
how many people do not use FB

If FB is still claiming they have 1.5 billion users, that would be 5.5 billion. Almost 80% of the world.

megaadam wrote:
I haven't logged in in 52 years.

Liar... Fartbook is not so old Roll eyes | :rolleyes:

M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.

I'm with you, except in my case, it's 74 years. I don't even know how to spell Facebook.

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