WTB: EPROM Emulator for 2716

I don't. I think I might still have some 2716's, though.

Are you looking here for something you can download code into and test, without the UV erasure step? Or something more complex than that?

Those things are a 'mere' 2k byte and 450ns cycle times, I think. One could almost make one of those from a cheap micro in today's world; with a socket conversion, anyway.

But no emulator laying about, despite the fact that I have a lot of old stuff hanging on shelves. Sorry.

Jon

Thanks for looking Jon! Yep... just trying to avoid having to burn, UV erase and burn again. I thought about making my own with a propeller micro but I need to start being more careful about "project creep." That is, it always seems that I have an idea to do something (in this case design a test rig with custom software for a 6800 based pinball machine) and then I decide I could do the project more efficiently if only I build another widget first. I would also be interested in most any tool that works with the motorola 6800/6802/6808. I've been on a real retro-computing kick... reading too many old issues of BYTE! tim

When were those in use, 30 years ago?

Yep... that's about right. This particular pinball machine is from around 1986... and the 6808 wasn't exactly new at that point. : )

Okay. Figured.

Didn't you know? It's widgets all the way down!! Seems like that to me, anyway. ;)

oh, my. Retro for me is more like core memory, drum memory, mercury delay line memory, front panels with soft but real switches that don't develop callouses when you use them to toggle in your programs, and if I move closer to the 6800 time line, maybe even some 1103 dynamic ram chips.

Those 6800 things came slightly after, if I recall, but that's not too far away from old recollections.

Hmm. I think the early ones were 1MHz. Might be able to emulate that, too, with another one of those widgets. ;)

Where are you picking up 6800's? I have a few 8080A laying about... damn... now I'm going to have to go see if I have any more of the 6800's in the box. (Probably, if I do, the pins are going to need some cleaning.)

Jon

Pinball!! Cool! We had a few pinball machines at home. My wife is .. well, it was very important to her that we had a few in the living room! However, no micros in those.

Then we had kids and moving and jobs that took up 36 hours a day of my time and... well...

We used to go, every week, to a pinball palace and buy up a fixed number of tokens and spend a few hours playing together (or separately.)

Good luck reprogramming the thing! Should be a lot of joy.

Jon

Someone over in sci.electronics.basics and .design is asking:

Subject: HDS-200 / Motorola 6800 Development tool

Is there any interest out there in this (antique) development tool? I've got one (it takes up a lot of space!) that I would like to part with.

Thanks, TomC

Not sure if that is something you could use.

Jon

Get a small 5V Flash and make an adapter socket. You will not find anything too small or slow.

IIRC, there were two kinds of 2716: one with supplies of +5V, +12V and -5V, and another with +5V only.

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Tauno Voipio

I may have a spare 2716 ppod for one of my logic analyzers -- but you'd need the logic analyzer as well! :>

If you are looking for real 2716's, I can probably find a few (even 1702's!). I *think* all the 2716's were interchangeable (IIRC, the mess happened with TI in the 2732 series) -- aside from access times.

If, OTOH, you are looking for a poor man's development tool, we used to use 2Kx8 SRAMs with a "write protect switch" epoxied (superglue didn't exist back then) to the top of the device. (this requires some forethought in laying out the PCB so you have access to a "write" signal)

4K parts (2732) were harder to fabricate in this manner as you had to piggy-back *two* 2K SRAMs, lift their CS legs and air-wire a small decoder mounted (legs up) on the top of the topmost SRAM. We called these "pigs" -- many early video games (arcade pieces) were developed this way. :> Sure beat the 30+ minute erase-burn-test cycles!

You might even look for an integrated BBRAM with some external logic on the WE signal (or, just reload it each time you power up)

You can try to find 2816 device (EEPROM pin compatible with 2716), so there will be no need for erasure and writing is also faster...

I've used them for development at the time...

- while(1);

Why worry? I often find the spinoff projects to be more useful than the original aim. Necessity is the mother of invention ...

Me too. It's much more effective than taking the rejuvenation pills ;-)

Cheers, Chris

Chris Burrows Astrobe v3.2: ARM Oberon-07 Development System

I have a Dataman Softy S4 - yours for £??? - make an offer by email if you are interested. It supports 2716 and you can still download code and eprom signatures from their website. It programs and emulates and has the emulator lead.

Michael Kellett

Here you go, this should work nicely:

They're electrically erasable. As long as your programmer supports the part...

There's lots of other sources as well. Use "28C16" in your query here:

All... thanks for all the info!

Jon... thanks for the tip on the 6800 development harware.

while(1) and JW... thanks for the idea about the 2816.

: )

Tim

Might depend on where you are and if one that works for bigger EPROM's could be adapted in some way to give you what you need. I have a pair that I think do up to the 512k size (will have to check) that run from the parallel ports. Made by Computer Solutions Ltd some years back.

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Hi Paul... thanks for the reply. I'm in the US (Texas). From what I can tell most emulators that did 512 also did smaller eprom emulation but sometimes they only emulated down to 2732s... but some do emulate

2716s... so kinda depends on the exact model. Not a real expert on 2716s v. 2732s but there may be some fundamental difference (besides size).

My recollection is that that was a nice period of time where most of the time most of the different sizes were voltage and pin compatible. But that might very well have been at or above the x32 size. The x16 might be different in some way. I'd have to go to a datasheet again, to know. Memory fails.

Your point is wise to hold in mind, lacking specifics, while looking around.

Jon

I

There was no difference between the 16 and 32 from a read point of view, just A11 was added. I think on the 2716 it was the programming voltage pin, but this may be wrong (I have not been designing eprom programmers which would program these for well over 20 years :-) ). But I am quite sure the 32 can "drop in" replace a 16 if the data are written in its upper half (Vpp for the 16 is held at 5V during read and this is where A11 is).

Dimiter

------------------------------------------------------ Dimiter Popoff Transgalactic Instruments

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Okay. Always good to sweep away a little ignorance and/or recover some lost memory. ;)

Thanks, Jon