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- Path: ccnet.com!usenet
- From: slider<>slider
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: 60ns-70ns-PAGE/STATIC ZIPP mix quest
- Date: 10 Feb 1996 03:47:28 GMT
- Organization: Jay Miner........Father of great things and a true engineering visionary...he is sorely missed around the world
- Distribution: world
- Message-ID: <4fh4gg$i11@ccnet2.ccnet.com>
- References: <4fd5kk$shr@ccnet2.ccnet.com>
- NNTP-Posting-Host: h108-14-206.ccnet.com
-
- -> slider writes:
- -> Ok memory gurus...small question
- -> I have an A3000 Tower with all the upgrade chips:
- -> buster/ramsey/DMAC
- ->
- -> I have 4-60ns Static column zips
- -> 12-70ns-Static column zips
- -> 8-70ns-Page Mode zips
- -> total 12Mb RAM
- -> Now the question:
- -> In what order should these be placed into an
- -> A3000 T so they would work?
- -> I know this is possible but unsure of order.
- -> I assume that first bank should be 70ns page mode zips
- -> followed by 70ns static column followed
- -> by 60ns static column.
- -> I assume this as the first bank of memory dictates how
- -> remainder of mem will be accessed and at which speed.
- -> Since static olumn zipp dram can be accesed in page mode
- -> but page mode cannot be accesed in static mode is why I
- -> assume the page mode 70ns zipps must be in first.
- -> Is this correct?
- -> Thank you,
- -> James Vigliotti
- -> slider@ccnet.com
- ->
- ->
- ->>>>
- I'll answer my own question again ;)
- After talking to the zip ram manufacturer's techs about the zips in question
- I came up with the folowing and it is working right now just fine.
- In order if you have static and page mode zips and different speeds
- you have to place them in the following order. I was correct from my first
- impression.
- Slowest PAGE mode zips go in first bank available followed by fastest PAGE mode
- zips followed by slowest STATIC collumn zips and finally fastest STATIC column zips
- Do not mix static and page mode or slower and faster zips within 1 memory bank on
- the A3000 I.E. Bank 1 comprises 8 chips and they all should be same type.
- Now mixing can work but according to NEC and TI techs, if the memory subsytem
- accesses banks at a time of a memory subsytem, having different speeds and types
- within the same bank possibly can cause problems.
-
- Here is my A3000T systems memory config as it stands now and is working correctly
- including different RAMSEY modes even though I did have to go against one item stated
- above from the techs.
-
- BANK-1 8 PAGE MODE ZIPPS 1X4 70NS
- BANK-2 8 STATIC COLUMN 1X4 ZIPS 70NS
- BANK-3 4 STATIC COLUMN 1X4 ZIPPS 70NS AND 4 STATIC COLUMN 1X4 ZIPPS 60NS
- With the 60ns ZIPPS being last.
- laterzzz
- James VIgliotti
- slider@ccnet.com
-
-