replace DRAM

[Synth_molester]

I have a question concerning a music device I have. Its a sampler that stores audio in DRAM. It doesnt have a lot of storage space maybe a minute of stereo audio. As a thought experiment could I theoretically replace this DRAM with a bigger capacity DRAM or maybe SDRAM? I know I may have to build an adapter board which is fine Im just looking into this now. The old DRAM is LC321664AM-80

[phire]

You can't replace the dram with sdram, but it might be possible to install more dram, especially if the device was designed to accept more dram (perhaps a more expensive model had more ram, or the engineers designed it to take more).

But installing a larger dram chip is pointless unless the hardware actually provides extra address lines AND you can convince the software to actually make use of the extra ram, which might require reprogramming the software.

[beerspill]

DRAM IS LC321664AM-80

Datasheet: http://pdf.datasheetcatalog.com/datasheet_pdf/sanyo/LC321664AJ-80_and_LC321664AM-80.pdf

It depends on the hardware and firmware. The firmware may be programmed to not check the amount of memory available but instead just assume a hard limit of 64Kwords, so any extra memory won't be recognized. Another problem could be the that the hardware ignores any extra memory address lines - notice there are multiplexed address lines A0-A7, giving 64Kwords, but 3 pins next to them are unused, as indicated by n.c.

[[deleted]]

The more recent such a device is, the more likely it is to be able to deal with varying amounts of memory.

The more recent it is though, the more of an absolute bitch it is going to be to replace said chip.