Anybody got a datasheet for Hitachi HM6116ZP-4 CMOS RAM

http://www.goldmine-elec-products.co...?number=G14750

Hitachi 2048-word x 8-bit high speed CMOS static RAM. These have been discontinued years ago but there are still many circuits that use them. We have a very limited quantity. Prime Hitachi branded!

Features:
Single 5V supply
High Speed: Fast access time
Directly TTL compatible
Equal access and cycle time
Completely static RAM: No clock or timing strobe required

24 pin DIP.
G14750

I was going to purchase one, but I would like to look at teh datasheet first.

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The 6116 is pretty much a generic chip and so any data sheet will do. Googleing 6116 gives this which should tell you everything you need to know.

What are you thinking of using it for?

Mike.

 

Wow pommie THANK YOU SO MUCH!!!!!

I am using this for the relay computer's memory RAM. It will be easy to interface it.

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I am going to need help to understand this. So to program this, how would I do that? Would I send it into the A bus or the I/O bus?

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To access the 6116 you need to setup the 11 address lines and the data lines. You then either set /wr and /cs low to write the location or /oe and /cs low to read it. It is ideal for a relay computer as there is no multiplexed busses and 2k is probably more than enough memory. To connect it to a pic would require most of the pic I/O and so would be a bad choice.

Mike.

 

G'Day Mike,
What he could do is to use a 8255 PIO between the PIC and the [static] 6116 RAM.
As the 'relay' computer will be slow, the PIO setup/loading shouldnt slow things down.
Krumlink, Google for a 8255 PIO datasheet.

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Gday Eric,

Aren't you in effect multiplexing thing by using an 8255. The simplicity of the non multiplexed bus is a definite advantage if your building a relay computer. Also, the fact that you will need ram in order to access the 8255 makes it doubly not a good idea.

Mike.

 

Hi Mike,
I have used the 8255 as an expander in the past with good results.

Ref attached image.

A more elegant way, would be a serial/I2C Ram.

Krumlink.
Any chance of a block diagram of the 'relay' circuit.?

Attached Images

6116a.gif (34.4 KB, 7 views)

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Eric " Good enough is Perfect "
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Hi Eric,

Using an 8255 with a pic chip to access a 6116 would be the way to go. For a relay computer I think it would actually complicate matters. Assuming that the Harvard architecture would be the simplest to implement in relays, then having ram and rom on the simplest busses would be the way to do it.

To use any serial eeprom would further complicate matters and again would require other ram in order to implement it. You would require a loadable address counter + a bit counter, not to mention some way to shift the address out.

I'm assuming that a relay computer would have rom/ram for code, ram for variables, no stack and switches/leds for I/O.

Mike.

 

hi Mike,
I thought Krumlink was making a pseudo 'relay' computer by using a PIC, this appears to be an incorrect conclusion.

You are burning the midnight oil again.

Regards

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Naaarh, only 10pm here.

Mike.

 

But the 8255 is a really limited 'horrible' device, there are MUCH better PIO chips available (like the 6522 for a start).

But considering this is supposed to be for a 'relay computer', isn't the memory supposed to made of relays? - isn't that the point?.

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That should indeed be the point. However, if you look at the link I posted on the other relay computer thread then the relay computer is the ALU and associated address/data busses. The actual memory used was silicon. Even with silicon memory the thing was still huge and not something I would like to attempt building. If you did do relay memory then you are going to be pushing the envelope at 256 bytes.

Mike.

 

Well based on past experience, I don't think there's a chance he's going to build it anyway!

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We were all that enthusiastic once and shouldn't knock it. However, your probably right.

Mike.