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Re: How do I determine if the 1-gig expansion has been installed?

2007-11-10 by duncan

ah- that's 1 meg, not 1 gig! :-)

this is a slightly confusing area because of the way the memory is
divided in two & the way it is addressed. I don't know how much actual
memory there is in either version in numbers of kB, but there were two
sizes at the time my 2002 manual was written, "stock" & "expanded".

[goes to reference library...]

the 2002 manual says that the machines will contain 256 or 512
thousand 12-bit words in total. in real money, that's 384kB or 768kB
of storage, which really isn't much, but is closer to matching the
capacity of one or both sides of the old single density 3.5" discs we use.

the book says that the stock machine used only one side of the floppy,
which is probably where we get the idea that it's 1/2 a meg. the block
count for an empty sample goes to 128, which probably means 128,000
12-bit words, & this is mirrored in the other half of the machine's
memory to give a total of 256,000 12-bit words.

I don't think there was an expansion beyond this, since it wouldn't
have all fitted on one floppy; remember that the machines work with
single-density discs only.

duncan.

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