Where To Buy Ram Board
Download File === https://blltly.com/2tlxVa
This board will be a little harder for people who might be newcomers to soldering, not so much because board is pretty much all SMD components, but because the the the SMD resistor arrays are a bit tricky to solder correctly.
I had too much work to do. I needed to get the main floor board up and see what was underneath. I was relieved to find that, for whatever reason, this board and tape came up much better and there were only a couple spots with Tuck Tape residue left behind. Wow, must be my luck day, I thought. But then I stepped back and surveyed the great room. Sonuvabitch.
Upgrading the memory in a computer is usually a straightforward case of swapping out a few DIMMs or SODIMMs, with the most complex task being to identify the correct type of memory from the many available. But sometimes a laptop manufacturer can be particularly annoying, and restrict upgradability by soldering the RAM chips directly to the board. Upgrading memory should then be impossible, but this reckons without the skills of [Greg Davill], who worked through the process on his Dell XPS13.
> restrict upgradability by soldering the RAM chips directly to the boardThe data rates are getting so high that soldered on to the board provides the most reliable and is the cheapest option. The alternative would be to add a 204 pin gold contact SO-DIMM edge connector coated with a thick enough layer of gold plating to last at least the specified minimum 25 mating cycles. That probably adds 5 to 10 bucks to the BOM and it is a through hole part that needs to be hand soldered in place which will probably add another 1 to 2 bucks to the final price. The socket will also uses up a lot of area on the PCB compared to a BGA which adds to the end cost, and requires more traces on the board than a BGA would require. The gold contacts on the SO-DIMM plug needs be thick enough to also last at least the specified 25 mating cycles, and SO-DIMM modules have additional chips to deal with the problems from the edge connector so are not as cheap as a BGA which is additional an cost.
Now that 4x SODIMMs allows for 128GB of RAM, 2x allows for 64GB, which really cuts into the audience for the 4x units; and means that it is almost entirely people who are looking for screaming power across the board.
I stare at a world where your pragmatic sentiment is evacuating the public forums and giving way to the Dunning-Kruger affected, en masse. After all, who has the time anymore to idle on their less accessible tech, the same tech that costs an increasing amount of time to afford
For sale is the Glitch Works Altair 680 Universal 64K RAM board. This board is a from-scratch new design for the MITS Altair 680 computer, designed and tested with the help of several members of the Altair Computer Club. It has been designed and tested to support front panel operation with the Altair 680, which requires extra circuitry due to the way in which the front panel operates. This board is also compatible with RAMtron/Cypress FM18W08 ferroelectric RAM (FeRAM), a nonvolatile "core on silicon" device.
Circuit boards are high-quality FR4 material, with leaded solder HASL surface finish and true hard gold plating on the edge connector. Measurements for board outline, edge connector, and standoff hole positioning were taken from a number of vintage MITS boards and averaged out. The mechanical dimensions of this board are the same as our GW-A680-1 prototyping board.
This project is available as a bare circuit board, board + parts kit, or fully assembled and tested. Assembled and tested boards are burned in on an original Altair 680 using Martin Eberhard's excellent memory test program.
Do note that, while the board supports a full 64K of RAM, there are special considerations for the top 8K of RAM. Enabling the 60-64K bank will conflict with the ROMs and ACIA serial port on the 680's' motherboard. Enabling the 56-60K segment will not cause conflicts, but will cause MITS BASIC to lock up since it hits the AC
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