Unused NOS Dynamic RAMs MHB, produced by Tesla, Czech Republic. Upward Pin Compatible with (16K Dynamic RAM). The price is for one IC (1 . Buy NTE ELECTRONICS NTE online at Newark element Buy your NTE from an authorized NTE ELECTRONICS distributor. TMS DRAM are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for TMS DRAM.

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The chip-synonym is Along the bottom of the matrix are sense amplifiers which turn the slightly higher or lower voltage into a definite high or low signal, which is then fed back into each capacitor in a row to fully charge or discharge it again. As also today with the PCyou have to not only choose the appropriate memory size, but you also have to know where the limit for the access time is. This takes the 8 bit row address and selects one of rows.

With the 4614 of the cross reference table one can see the classifications of each of the producers for RAM chips. Three of these chips expandable by another 8 make up the main memory in the VIC Are you trying to monitor or share data with the other system?

MHB4164 Tesla 4164 64k X 1 Dram Dynamic RAM

The computer’s CPU will be halted and tri-stated during this so I only have to share the bus with the video chip. Do you need to write or is snooping enough? Sign up or log in Sign up using Google.


I am fully aware that I might be asking the impossible but I’m sure there must be a way. The information of a DRAM must be refreshed after a few milliseconds. Any ideas on drxm to achieve this would be helpful to get me started.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. At that point, the whole row is refreshed.

org • View topic – dram refreshing!

4146 Post as a guest Name. At the top of the matrix is a precharge circuit which charges each column to half the supply voltage; when each capacitor in a row is connected to a column line, it swings the voltage slightly higher or lower than half, depending on the bit stored in the capacitor.

4614 from ” https: Sign up using Email and Password. Previous topic Next topic. Next, there are often one or more letters, which dtam stand for the housing shape. Email Required, but never shown. Users browsing this forum: On the left side of the matrix is a row selector, which basically consists of a large demultiplexer.

Perhaps you should start by explaining why you would want to. The bit address bus and 8-bit data bus are available to connect to.


It certainly makes no sense today as a storage device. The memory is constructed from DRAM chips of varying speeds the slowest of which are ns parts hence the requirement. Tue Jul 08, 3: I have done quite a bit drzm Arduino projects previously. The RAM in question is dynamic and is refreshed by another system so this would purely be bit addressing with an 8-bit data bus.

In other languages Deutsch. If you need one of the chips, you can also use a instead. I have an idea I’d like to pursue and partly because of their speed and partly because I’d like to begin ARM development I think a Cortex based board might be a good fit. The CPU can be halted and its bus lines put into a high impedance state so that an external device can access the memory.

You have to solder a short piece of wire between pins 1 and 16 of that chip these are the pins just left and right of the alignment notch on the chip. The external device must respect the video chip accesses which 41164 indicated by a signal line.