Q: How much can the DSP memory be expanded? Is it really in increments of 32kB, as the price list says? Is the DSP memory that comes with the machine 8k or 24k?\
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A: The DSP56001 uses 24-bit words. A source of confusion is that sometimes the memory size is reported in terms of words and at other times in terms of 8-bit bytes. Every NeXT computer is shipped with 24 kilobytes of DSP zero-wait-state RAM (sometimes referred to as 8k (24 kilobytes is equal to 8 24-bit kilowords)). The memory expansion available from NeXT is a 72-pin SIMM that fits on the main board. Contrary to what the price list says, the DSP memory expansion is 96 kilobytes, not 32. (96 kilobytes is equal to 32 kilowords.) But the price is correct: $195 list (as of January 1991).\
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There is only room for one SIMM. The maximum addressable memory is 576 kilobytes, but there is no SIMM available at this time other than the 96kB one, from either NeXT or third parties. \
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Only the 68040 boards have the option of expanding the DSP memory; the older 68030 boards, which also came with 24 kilobytes of DSP memory, do not have this capability.
\fc0 However, t
\pard\tx1140\tx2300\tx3440\tx4600\tx5760\tx6900\tx8060\tx9200\tx10360\tx11520\fc0 he DSP configuration
\pard\tx960\tx1920\tx2880\tx3840\tx4800\tx5760\tx6720\tx7680\tx8640\tx9600\fc0 of a cube
\pard\tx1140\tx2300\tx3440\tx4600\tx5760\tx6900\tx8060\tx9200\tx10360\tx11520\fc0 can be greatly augmented with an additional third-party board, such as the Ariel QuintProcessor. \
