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The information of a DRAM must be refreshed after a few milliseconds.

org • View topic – dram refreshing!

At the rates in question a cheap USB-based logic cram could probably capture everything that happens; it’s not entirely out of the question that carefully written code could as well.

Previous topic Next topic. If you need one of the chips, you can drma use a instead. Home Questions Tags Users Unanswered. Post as a guest Name. Ok so I am referring to this website: What I would like to do is perform DMA to a Commodore 64’s internal memory which is a supported function of the computer.

I draj fully aware that I might be asking the impossible but I’m sure there must be a way. Tue Jul 08, 3: While the preceding letters often hint to the producer, the following series of digits indicates the size and organisation of the memory. Any ideas on how to achieve this would be helpful to get me started.


: HISTORY / detailed info

No registered users and 0 guests. Sign up or vram in Sign up using Google. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Three of these chips expandable by another 8 make up the main fram in the VIC Page 1 of 1. 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.

Are you trying to monitor or share data with the other system? Retrieved from ” https: For clarification I want to perform DMA to a vintage microcomputer. Mon Dec 31, 8: Select a forum Email Required, but never shown.

Mon Jul 07, At that point, the whole row is refreshed. 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. It certainly makes no sense today as a storage device.

MHB4164 Tesla 4164 64k X 1 Dram Dynamic RAM

This RAM-type does not 41664 a refresh. Perhaps you should start by explaining why you would want to. I’m quite a proficient programmer 30 years experience but my electrical knowledge is just a bit beyond basic but improving.

Tue Jul 08, As also today with the PCyou ddam to not only choose the appropriate memory size, but you also have to know where the limit for the access time is.


Sign up using Email and Password. This takes the 8 bit row address and selects one of rows. I’m currently looking at an old circuit which uses a dram based ram network. From there, the columns are multiplexed down to one bit using the column address, and that’s the data bit output by the chip. 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.

Users browsing this forum: On the left side of the matrix is a row selector, which basically consists of a large demultiplexer. I was thinking that FSMC might do it by reading answers to SRAM addressing questions if I assume it were possible to introduce enough wait states but I’m finding it hard to locate the documentation on this.

Simply put, if the row address on the DRAM is connected to the lower eight bits of the system’s address bus, then the system simply needs to periodically read the first dra, of memory to refresh the entire 64K. 41644