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#11
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PB 450 motherboard
Hi Ben!
"Ben Myers wrote in message There is some possibility that the absence of cache memory on the 450 motherboard is the reason the POD with interposer would not work properly. Stay tuned, as I do an archaeological dig through my older parts and attachments. It's possible I will unearth one of the "short" tag SRAM chips needed for a fully functioning cache on this board... Ben Myers That would be great. I haven't looked through my box yet. I probably don't have the right one anyway. Although I claim to be a very good computer tech, I don't claim to be infallible. If you get time, take a look at the UK 450MB page again: http://www.uktsupport.co.uk/pb/mb/450.htm .... and confirm my interpretation of the jumper settings. From what *I* can tell, the settings are identical for the factory 486DX-2/66, DX4-100, and P24T 83MHz POD. If I'm wrong, let me know. Please note: my motherboard does not have a jumper 29. I have J28 set at 1-2, never changed it. As a reminder, my machine will boot to the BIOS identifying the CPU as a P24T 100MHz, then lock-up at that screen. Hard lock, turn off required. Thanks Ben. bob |
#12
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PB 450 motherboard
On Sep 3, 6:20*pm, "Robert E. Watts" wrote:
Hi Ben! "Ben Myers * wrote in message There is some possibility that the absence of cache memory on the 450 motherboard is the reason the POD with interposer would not work properly. Stay tuned, as I do an archaeological dig through my older parts and attachments. It's possible I will unearth one of the "short" tag SRAM chips needed for a fully functioning cache on this board... Ben Myers That would be great. I haven't looked through my box yet. I probably don't have the right one anyway. Although I claim to be a very good computer tech, I don't claim to be infallible. If you get time, take a look at the UK 450MB page again: http://www.uktsupport.co.uk/pb/mb/450.htm ... and confirm my interpretation of the jumper settings. From what *I* can tell, the settings are identical for the factory 486DX-2/66, DX4-100, and P24T 83MHz POD. If I'm wrong, let me know. Please note: my motherboard does not have a jumper 29. I have J28 set at 1-2, never changed it. As a reminder, my machine will boot to the BIOS identifying the CPU as a P24T 100MHz, then lock-up at that screen. Hard lock, turn off required. Thanks Ben. bob Is he using an Intel ODP 63 or 83MHZ They all say 100mhz on boot for the above but that is just the bios . Still works as as ODP in mine. There was a floppy with my ODP for checking |
#13
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PB 450 motherboard
"metronid" wrote in message Is he using an Intel ODP 63 or 83MHZ They all say 100mhz on boot for the above but that is just the bios . Still works as as ODP in mine. There was a floppy with my ODP for checking ***** I am using an 83MHz POD. There is no difference between 63 and 83Mhz versions. The 63MHz POD is for people who don't know how to switch their FSB from 25MHz to 33MHz. ( Or for motherboards that don't have that option; for example boards with oscillators, although those are changeable also. ) I have never seen a 63MHz version that would not run at 33 or even 40MHz FSB ( 100MHz ) I have done it lots of times. I have the POD floppies also, that doesn't make the motherboard run one. I'll do some more checking/testing soon. bobwatts |
#14
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PB 450 motherboard
On Sep 4, 8:23*pm, "Robert E. Watts" wrote:
"metronid" *wrote in message Is he using an Intel ODP 63 or 83MHZ They all say 100mhz on boot for the above but that is just the bios . Still works as as ODP in mine. There was a floppy with my ODP for checking ***** I am using an 83MHz POD. There is no difference between 63 and 83Mhz versions. The 63MHz POD is for people who don't know how to switch their FSB from 25MHz to 33MHz. ( Or for motherboards that don't have that option; for example boards with oscillators, although those are changeable also. ) I have never seen a 63MHz version that would not run at 33 or even 40MHz FSB ( 100MHz ) I have done it lots of times. I have the POD floppies also, that doesn't make the motherboard run one. I'll do some more checking/testing soon. bobwatts I have been building amplifiers for years. I do not run above the manufacturer ratings. This often leads to failure of component. The fact that a 63mhz will run at 83mhz (33mhz at 2.5 x) only means the item is not locked. Intel could possibly have sold the same processor with just markings changed but I go with their secs. Overclocking can often lead to problems. In any case Using silly logic The problem is either the processor the board or the installer. Logically eliminate each factor. Will the processor work in another board. Will the 450 work with the original processor Are the jumpers Jumpers J25 J29 J31 CPU Speed Multiplier SX/DX 486SX25 1-2 1-2 5-6 486SX33 2-3 1-2 5-6 486SX/2-50 1-2 2-3 5-6 486DX-33 2-3 1-2 1-2 & 3-4 486DX/2-50 486-25 486DX/4-75 P24T-62MHz 1-2 2-3 1-2 & 3-4 486DX/2-66 ODP486-33 P24T-83MHz 2-3 2-3 1-2 & 3-4 486DX/4-100 2-3 none 1-2 & 3-4 Are you using version 1.1a bios |
#15
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PB 486 'cruising the net
Hi!
PB 486 does not like the POD with or without an interposer. I'm coming in late to the discussion (betcha you're surprised to see me here--well, I do still have some PB stuff!) but I tend to think the problem lies in either cache or BIOS revision. And I'm thinking it's a caching problem. Remember all the fun we've had to the Lacuna boards over in the PS/2 world? Boots to BIOS screen, recognizes it as a P24T running at 100MHz (?), and stops/locks up. That much is quite possibly OK. I've got an HP Vectra XA 486 desktop that got "PODified" some while back and it's always had the clock speed wrong in the BIOS. It runs, and is stable with every program I've ever tried on it. Other utilities for checking on the CPU speed show it to be running at the correct 83 or so MHz. Not sure how system setup gets the "100MHz" figure. Does not like a Kingston 133MHz Turbochip. Does the same EXACT thing above. On those it may be a CPUID issue. If a value is returned that the system doesn't like it might just freeze. I know you don't really want to flash the BIOS, but I'd check and recheck the cache situation (it *should* run with nothing there--other systems do) and then update the BIOS to the latest revision. William |
#16
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PB 486 'cruising the net
Hello William !!!!!!!!!!
"William R. Walsh" m wrote in message news:br1zk.341627$yE1.278136@attbi_s21... Hi! PB 486 does not like the POD with or without an interposer. I'm coming in late to the discussion (betcha you're surprised to see me here--well, I do still have some PB stuff!) Surprised ?? ¿¿¿ !!! Well, in the words of the immortal Chevy Chase, " I couldn't be more surprised if I woke up and my head was sewn to the carpet" ! Boy Howdy, the gang on the PB NG will be glad to "see" your participation! but I tend to think the problem lies in either cache or BIOS revision. And I'm thinking it's a caching problem. Agreed. But remember, this board is devoid of L2 cache. Remember all the fun we've had to the Lacuna boards over in the PS/2 world? Sure, remember very well. I'm one of the few who got the L2 module to run most of the time with my '77i's and '76i's. Really ****ed Louis off most of the time too. :-) Boots to BIOS screen, recognizes it as a P24T running at 100MHz (?), and stops/locks up. That much is quite possibly OK. I've got an HP Vectra XA 486 desktop that got "PODified" some while back and it's always had the clock speed wrong in the BIOS. It runs, and is stable with every program I've ever tried on it. Other utilities for checking on the CPU speed show it to be running at the correct 83 or so MHz. Not sure how system setup gets the "100MHz" figure. Yeah, I remember this also with various clone boards in the past. Back during the time of steam powered cars. :-) Does not like a Kingston 133MHz Turbochip. Does the same EXACT thing above. On those it may be a CPUID issue. If a value is returned that the system doesn't like it might just freeze. I know you don't really want to flash the BIOS, but I'd check and recheck the cache situation (it *should* run with nothing there--other systems do) and then update the BIOS to the latest revision. Well, therein lies the problem. The PB BIOS is goofy. I'm reluctant to mess with it unless it's last resort. This is an exceedingly rare computer, and works great in every way except for the POD. I also feel that a BIOS update will correct the "problem", but I'll have to think about it before I do anything. I *think* I have BIOS version 1.17, and BIOS 1.1A ( or something) is the latest. Can't remember exactly. Got it downloaded, just scairt to use it. Until this computer came along, I was beginning to be convinced that the P60/66MHz machine didn't exist in an "art deco" tower form. And it may not. But the fact that a 486 desk top "art deco" case exists leads me to believe that a P60 tower *should* exist. I have two P60 desktop cases like this, and I really think I saw these new in stores in tower form. I want one. As well as a 486 tower. I'm pretty sure they made 'em. At this time I have "filed" the 486 PB, and probably won't get back to it for some time. I have already completed a lot of "winter projects" 'cause it was just too damn hot and humid to go outside lately. :-) Getting pretty good at replacing caps and mosfet voltage regulators. I have brought some rare boards back to life lately. Got a Matsonic MS6260S ( PcChips ) with 1M of L2 working again, and a K63-450 to play with for example. You don't see many Socket 7 boards with 1M of L2. For that matter, you don't see many PB's with ANY L2. Stupid. PB collection is approaching 25. I know.......... therapy. Good to see you here Bill! Your contribution will be really appreciated ! bobwatts -- boBWatts®© EartH Watts Carburetion Service Whizzbang Computers Official collector of: transfat asian plastic junk trinkets ! |
#17
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PB 486 'cruising the net
Incorrect reporting of clock speed was a major problem with almost any 486
motherboard BIOS, because the designers/programmers of the BIOSes back then never ever anticpated the Pentium OverDrive and the 133MHz 486 workalikes. The problem even occured on early Pentium systems when PowerLeap and others introduced their various CPU upgrade kits. This all takes me back a ways. Still looking for the "short" 18-pin cache chip needed for a complete PB 450 external cache. I think that would fix the POD problem... Ben Myers On Sun, 14 Sep 2008 05:38:15 GMT, "William R. Walsh" m wrote: Hi! PB 486 does not like the POD with or without an interposer. I'm coming in late to the discussion (betcha you're surprised to see me here--well, I do still have some PB stuff!) but I tend to think the problem lies in either cache or BIOS revision. And I'm thinking it's a caching problem. Remember all the fun we've had to the Lacuna boards over in the PS/2 world? Boots to BIOS screen, recognizes it as a P24T running at 100MHz (?), and stops/locks up. That much is quite possibly OK. I've got an HP Vectra XA 486 desktop that got "PODified" some while back and it's always had the clock speed wrong in the BIOS. It runs, and is stable with every program I've ever tried on it. Other utilities for checking on the CPU speed show it to be running at the correct 83 or so MHz. Not sure how system setup gets the "100MHz" figure. Does not like a Kingston 133MHz Turbochip. Does the same EXACT thing above. On those it may be a CPUID issue. If a value is returned that the system doesn't like it might just freeze. I know you don't really want to flash the BIOS, but I'd check and recheck the cache situation (it *should* run with nothing there--other systems do) and then update the BIOS to the latest revision. William |
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