28 November 2017, 01:40 | #1 |
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Any reason an A3000 wouldn't enable ramsey burst mode with SC memory?
Hi,
I have recently aquired an A3000. It is a 25MHz rev 6.1 machine with kickstart 3.1. It came with 2MB chipram and 1MB fastram as DIPs, so I ordered 8MB ZIP RAM to make it much more usable. To be more exact, the chips I ordered are Toshiba TC514402AZ-60, which according to the datasheet is static column RAM. The ZIPs work when mounted, however the performance is the same as with the DIPs. Measured the same fastmem bandwidth with bustest and in SysInfo it scores the same 0.9 times performance of the reference A3000. If I check the Ramsey settings with RamseyConfig or SetRamsey, they both say burst isn't enabled, which I understand it should be with static column RAM. It does however explain the lack of performance increase. Both of them also crashes the machine if I try to enable burst, albeat in slightly different ways. What also is rather worrying is that I noticed that it looks like the labels on the ZIPs have been sanded away and reapplied, so perhaps they are just rebranded regular ones. Having almost no prior A3000 experience, I have to ask if there is anything else that could cause this, or is it simply not static column RAM? |
28 November 2017, 03:49 | #2 | |
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The good news is that the previous owner has completed the bidecennial maintenance on them so you shouldn't have to worry. Where did you buy them from? |
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28 November 2017, 04:45 | #3 |
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28 November 2017, 10:46 | #4 | |
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Check all the parts in BANK 0. I have read that the A3000 tests only BANK 0 during "POST" too determine if the chips are FP or SC. Last edited by alexh; 28 November 2017 at 14:33. Reason: Fixed mistake in description |
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28 November 2017, 13:52 | #5 | ||
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Hong Kong based ebay seller.
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Quote:
The setup looks like this: |
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28 November 2017, 14:38 | #6 |
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Fat fingers. I was reading the manual 4-16 and just typed it in the wrong way around.
Looks like you've done everything you can and your chips must be FP rather than SC. Totally unrelated but I noticed from your photo you've got a Rev 07 buster and a Rev 04 Ramsey. There is someone on AmiBay selling both Rev 11 Busters and Rev 07 Ramseys at the moment if you want them. http://www.amibay.com/showthread.php?87134 http://www.amibay.com/showthread.php?87319 Remember to get the correct tool for removing PLCC chips from sockets so you don't break the socket. You could also look for the AM33C93A-16PC which is the newer SCSI chip. All three upgrades not necessary unless you want to use A3640 and Zorro III DMA cards (like Deneb or Fastlane) Last edited by alexh; 28 November 2017 at 14:57. |
28 November 2017, 16:22 | #7 | ||
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Quote:
Last edited by SpeedGeek; 28 November 2017 at 16:28. |
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28 November 2017, 21:39 | #8 | ||
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The reason for ordering a Buster-11 was because I was curious to see if it makes the X-Surf-100 I put in it behave normally. The card works perfectly in both another ZorroIII Buster-11 machine and a ZorroII machine, but in the A3000 it keeps doing some weird "stalling". For example if you telnet to a host and start typing text, the network traffic pauses about a second every five to ten seconds or so. Really weird. I have tried both the available 030 versions of x-surf-100.device, same behaviour for both. I only have Super DMAC-02 which I have read isn't supposed to work well with Ramsey-07, but some claim it works for them, so I figured can always test it. Btw, when reading the Ramsey datasheet, I noticed that there are some general improvements in rev 07 apart from bug fixes. I think the SKIP mode which removes one waitstate for memory accesses is quite well known. But it also mentions that -07 can generate word-aligned DMA-addresses for the Super DMAC, while -04 can only do longword-aligned, so less chance to have to do a PIO transfer with -07. Had never heard about that one. Not really sure I am having issues with the old WD SCSI chip, but it is always fun to test and tinker . Did get one random checksum error after adding a second drive, but it has never appeared again. And yes the diode situation has not been taken care of, but there is termination power from another device on the bus and termination at both ends. You are right, it does look extremely suspicious, but I wanted to get some more opinions as I have zero experience with SC ZIPs in A3000. |
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29 November 2017, 12:11 | #9 |
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Please report back on your mismatched Super DMAC <-> Ramsey experiment once you've had a chance to try it.
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30 March 2018, 17:56 | #10 |
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Same Ram and same problem.... "china ram" is always FP????
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20 September 2018, 09:25 | #11 |
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I got the same chips from the seller on eBay. They are fake and not Static Column. They mostly work (night have been desoldered too hot when they were likely pulled of some board), but one was completely dead and I got random lockups with the remaining. I’ll use them with something different than an A3000. Might work with the A2386SX Bridgeboard, the Oktagon, or the Harms Professional A2000 accelerator.
As stated in a prior post - the chips surfaces have been sanded and relabeled if you look closely. |
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