Nigel Goodwin

Considering this
http://www.electro-tech-online.com/r...ht-seeker.html
is about as far as he goes, I can't see him building anything like a relay based computer

And to be honest, it's seriously a complete waste of time and money anyway, if (for historical reasons) you wanted to see what one was like, it would be fairly easy to write a simulator on a PC.

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ericgibbs

hi Nigel,
I did say in the 'past', I suppose I should I should have said, 'in the distant past'.
Remember at one time time, it was cutting edge!.

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

Pommie

Nigel,
You are absolutely correct, however, at his age I was going to conquer the world and be the most famous person ever. Unfortunately, I only managed half of that.

The youth of today should be encouraged at every step. Krumlink appears to have a lot of enthusiasm and gets on and does things. Let's encourage him and others to have a go.

Mike.

ericgibbs

Mike,

For whats its worth, I agree 100%

I achieved most of my goals and I try to help others to do the same...

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

blueroomelectronics

3V0 managed to focus Krumlink for a short while, and Krumlinks school robot (with the globe) looked great (was it a VEX?).
Krumlink appears to be driven by visual / physical projects. A microcontroller IC looks pretty meek and may appear uninteresting compared to something mechanical.

Differential engine (an early mechanical computer) the meccano version is a monster.

This wee 12F509 device is a very power micro computer

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Bill
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Krumlink

I still study PIC mcu and I am still very much interested in it. The robot was built out of scratch, no prefab parts (I hate lego and vex because of this). I LOVE PIC and mcu, it is just understanding a 2nd language is hard, aka C (I know english, leet and learning c )

UH NIGEL? HELLO BINARY CLOCK???

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Krumlink

So, at what speed will the SRAM output? will it just spew out data as fast as possible or at a set speed?

(I am thinking it output's at the clock speed)

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Nigel Goodwin

It will output just as fast as you ask it to, you set it's address lines, and it outputs the data from that address on the data lines. It's a static RAM (CMOS so can be battery backed) so can be run as slow as you like.

I've got an old Microtan 65 memory card with battery backed 6116's on, from years and years ago.

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PIC programmer software, and PIC Tutorials at:
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Krumlink

So how do I set it's speed lol

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Nigel Goodwin

You don't really, you set it's address lines, and the output reflects what's in that address - so how fast you change the address lines sets the speed.

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http://www.winpicprog.co.uk

3v0

My work with Krumlink has been plagued by equipment problems on his end. Once we got that sorted he was too busy to keep appointments.

Krumlink has too many irons in the fire. We postponed further study till after the FIRST robotic competitions are over. Maybe till after school is out.

When things are less hectic and he has the time to be serious about learning we will try again.

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Krumlink

Ok! So I send in the clock signal into the address lines to change it, and it changes lines at that speed?

Edit: so this is where the finite state machine comes in?

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Krumlink

Uh that was a question, I send in the signal to change address lines?

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aussiepoof

If you want some 6116's and other static rams to play with you can have all of mine for free (well, plus postage)... in fact I probably have 8255's as well.

Let me know,
P.

ericgibbs

hi,
If you used a 8255 PIO to connect to the 6116 SRAM, you would do the following write/read sequence.

Change the PIO's portA to output.
Set the PIO's portA to say the 8 bit data you want to write to the SRAM.
Then set the PIO's portB and portC[low nibble] to the the address [location] in the SRAM where you want the data on portA to be written.
Then set the SRAM WR and CS low and high,[using portC[high nibble] this will write the data to the addressed SRAM location.

For reading the SRAM,
Change the PIO's portA to input.
Then set the PIO's portB and portC[low] to the the address [location] in the SRAM where you want the data on portA to be read from
Then set the SRAM CS low and high, this will place the data of the addressed SRAM location onto the portA, which the program then reads.

As you can see, the write/read cycle is much longer than the 'clock' rate.

It would help if you could post a block diagram of your project.

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/