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Author Topic: 550 EPROM sizes  (Read 4920 times)
KirkLasVegas
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« on: March 24, 2010, 04:29:04 AM »
Here is a question I have. I noticed some of the Program and sound chip sets use 4001/040 while others use 801/080 chips.
When I look at the file sizes, they seem to be 1.0meg.
I'm familiar with the jumpers for 1-4Meg/8Meg on the 1.5+ CPU board.
How does one tell if the program REALLY needs a 8 Meg chip or a 4 Meg will do the trick?
Thanks!


Kirk
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Foster
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« Reply #1 on: March 24, 2010, 04:58:26 AM »
The chips are rated in bits and files are in bytes.
The chips are configured so many bits wide for parallel EPROM's
27c080 or 801 is 8Mbit with a data path width of 8 bits or 1Megabyte in size or the size you need for your files.
27c040 or 4001 is 4Mbit with a width of 8bits or 512Kilobyte in size.
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« Reply #2 on: March 24, 2010, 05:03:22 AM »
Quote from: Foster on March 24, 2010, 04:58:26 AM
The chips are rated in bits and files are in bytes.
The chips are configured so many bits wide for parallel EPROM's
27c080 or 801 is 8Mbit with a data path width of 8 bits or 1Megabyte in size or the size you need for your files.
27c040 or 4001 is 4Mbit with a width of 8bits or 512Kilobyte in size.

Thanks Foster!
Thats what I was thinking....
Seems most of the files I look at are indeed 1.0 Megs in size, very few are 512K.
Time to look for "Specials" on 27C080 or 27C801's


Kirk
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Buzz
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« Reply #3 on: March 24, 2010, 05:41:02 AM »
http://www.buyicnow.com/   

Kirk  I think we have been here before, but I always get very good chips from this guy.
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« Reply #4 on: March 24, 2010, 06:26:41 AM »
Quote from: Buzz on March 24, 2010, 05:41:02 AM
http://www.buyicnow.com/   

Kirk  I think we have been here before, but I always get very good chips from this guy.

Agree with Post Me, too!
The chips come well packed and in great shape. It should take about two weeks from the Hong Kong ship date to arrive on the west coast and three weeks to arrive on the east coast. YMMV.
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stayouttadabunker
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« Reply #5 on: March 24, 2010, 12:44:38 PM »
I think they're trying to avoid you.... Tongue Out

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« Reply #6 on: March 24, 2010, 07:38:24 PM »
Quote from: stayouttadabunker on March 24, 2010, 12:44:38 PM
I think they're trying to avoid you.... Tongue Out

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« Reply #7 on: March 24, 2010, 07:44:50 PM »
 bust gut laughing bust gut laughing "...ya never know whatcha gonna git."  Crazy
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