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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For clarification I want to perform DMA to a vintage microcomputer. Page 1 of 1.

If you need one of the chips, you can also use a instead. 464 Required, but never shown. The chip-synonym is This RAM-type does not need a refresh.

The book itself explains how it all works, so there is a fantastic guide to solving your design there. Home Questions Tags Users Unanswered. Perhaps you should start by explaining why you would want to. The chips of computers, which are used as temporary memory, are called RAM. The RAM of the C64 can be enhanced with drma.

MHB Tesla 64k X 1 Dram Dynamic RAM | eBay

In other languages Deutsch. 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. The information of a DRAM must be refreshed darm a few milliseconds.

fram Eight such chips in a row provide an 8-bit data bus and 64K bytes of memory. On the Commodore 64, the video chip took care of it automatically, and so refresh was completely invisible to the processor.

MHB4164 Tesla 4164 64k X 1 Dram Dynamic RAM

At that point, the whole row is refreshed. Mon Jul 07, 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.


It’s probably possible, but implementation details will be specific to the device you are interfacing to. At the rates in question a cheap USB-based logic analyzer could probably capture everything that happens; it’s not entirely out of the question that carefully written code could as well.

Any ideas on how to achieve this would be helpful to get me started. The computer’s CPU will be halted and tri-stated during this so I only have to share the bus with the video chip. I have done quite a bit of Arduino projects previously.

Robin Elvin 3.

Next, there are often one or more letters, which 416 stand for the housing shape. It certainly makes no sense today as a storage device.

I am fully aware that I might be asking the impossible but I’m sure there must be a way. Post Your Answer Discard 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.

Finally, there is again one or more digits, e. Note I am not attempting to design a based circuit with drams! Previous topic Next topic. You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum.

Building black plywood Habitrails”. By clicking “Post Your Answer”, you acknowledge that you have 464 our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Tue Jul 08, No registered users and 0 guests. While the preceding letters often hint to the producer, the following series of digits indicates the size and organisation of the memory.


Sign up using Facebook. Mon Jul 07, 3: Tue Jul 08, 3: There are some bus contention signals to take into account video chip access gets priority.

I need to write back to RAM. With the help of the cross reference table one can see the classifications of each of drwm producers for RAM chips. 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 bytes of memory to refresh the entire 64K.

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: HISTORY / detailed info

Sign up or log in Sign up using Google. From there, the columns are multiplexed down to one bit using the column address, and that’s the data bit output by the chip. DRAMs are organized internally as a square matrix. The input – also programs and data – will be loaded into the ram before the CPU can run this program.

What I would like to do is perform DMA to a Commodore 64’s internal memory which is a supported function of the computer. Three of these chips expandable by another 8 make up the main memory in the VIC Along the bottom of dfam matrix are sense amplifiers which turn the slightly higher or lower voltage into a definite high or low signal, which is then fed back drm each capacitor in a row to fully charge or discharge it again.

The bit address bus and 8-bit data bus are available to connect to. As I’ve had a couple of requests for more information I will add some more detail.