Re: jpeg viewers

[dklugh@iwaynet.net]

On 1997-05-02 pubpc1@library.ucla.edu said:
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   >Date: 2 May 1997 16:07:43 GMT
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   >spec@vax2.concordia.ca (Mitchell Spector) wrote:
   >>Even the Apple IIgs is heavily
   >>bogged down trying to decode a JPEG image and takes what seems
   >>like ages (my 15 MHz accelerator helps, but it is still relatively
   >>unbearable, the reason I now use my PC exclusively for handling
   >>that format). I shutter to think how long it would take a 1 MHz
   >>Apple IIe to decompress a JPEG or convert it into another format
   >like GIF. >
   >>Mitchell Spector
   >>spec@vax2.concordia.ca
   >The 15MHz 65C816, although fast, is still lacking an FPU.  I noticed
   >that when comparing a 13.75MHz '816 in a GS against a 25MHz '486 in
   >a PC, in word processing and page layout applications, the GS is
   >faster.  In graphics manipulation and spreadsheets, the GS falls
   >behind.  The FPU in the '486 is a tremendous advantage in such
   >tasks.
   >To be fair, Mac and PC computers that lack FPUs (for example, '286
   >machines or 68000 based Macs) are also slow at such tasks, as are
   >crippled versions of the '386 and '486 that some PC makers sold.
   >The way someone once explained it to me is this.  For a CPU chip
   >without an FPU to do, for example, division, it has to break
   >everything down into addition and subtraction operations.  In other
   >words, it must do long division (subtract, bring down the remainder,
   >and repeat at the next decimal place) like a human being would do
   >with pencil and paper.  With an FPU, the CPU is freed from doing
   >this.  Thus, what would take many operations now takes only one.

The 8086 CPUs suport multiplication and division.
What you're talking about is the difference between interger number math and real number math.If you're just doing interger math (like DOOM),a FPU is useless for you.

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