Looking for oldschool mother board
Hi, I got a broken old pc. It is a challange to fix it for me. There is a hdd with an unix system and with a special software. it is a parth of a machine for industry. It seems taht thw sw is connected with a hardware on the computer.
I am looking for details information about this motherboard http://i40.tinypic.com/2lmmfiq.jpg Yes, it is little bit out of date. Does anyone know a detailed information or a shop who can sell this type of mb? Thank you for any information! Martin |
Looking for oldschool mother board
On Wed, 26 Jun 2013 15:57:37 -0400 Yousuf Khan
wrote in Message id: : On 21/06/2013 4:07 PM, wrote: Hi, I got a broken old pc. It is a challange to fix it for me. There is a hdd with an unix system and with a special software. it is a parth of a machine for industry. It seems taht thw sw is connected with a hardware on the computer. I am looking for details information about this motherboard http://i40.tinypic.com/2lmmfiq.jpg Yes, it is little bit out of date. Does anyone know a detailed information or a shop who can sell this type of mb? Thank you for any information! It looks like it could be an old Socket 7 motherboard, but I can't be sure without a more close up picture of the empty socket. If it is a Socket 7, then any old Pentium motherboard will be able to replace it. There must be tons around. You might even be able to get a better CPU in the process. Yousuf Khan ASSuming it's x86, it looks like a 486 MB to me. Not enough pins for a Pentium 60MHz or 66MHz... Looking at that weird slot though, it might not be an x86 PC type. |
Looking for oldschool mother board
On Fri, 21 Jun 2013 13:07:38 -0700 (PDT), wrote:
Hi, I got a broken old pc. It is a challange to fix it for me. There is a hdd with an unix system and with a special software. it is a parth of a machine for industry. It seems taht thw sw is connected with a hardware on the computer. I am looking for details information about this motherboard http://i40.tinypic.com/2lmmfiq.jpg Yes, it is little bit out of date. Does anyone know a detailed information or a shop who can sell this type of mb? There's a Cyrix CX-83D87-33 math coprocessor (compatible with Intel's 80387) on that board, so I'd say it's an i386 mobo, running at 33 MHz. You DO know there's no CPU on that board (it's the empty socket on the top-right), don't you? And that it can't work without a CPU? And it only has one SIMM (memory module) installed: I think it probably needs all four SIMMs to work. BTW, I had an Intel mobo with an i386-25 in the early '90s, to which I later added a Cyrix FasMath math coprocessor, which was much cheaper and faster than Intel's 80387. It came with four 512 KB SIMMs (total 2 MB), which I later upgraded to four 2 MB SIMMs (total 8 MB). It has been trashed long ago, of course... -- To reply by email please remove .no.spam from the supplied address |
Looking for oldschool mother board
On Thu, 27 Jun 2013 16:44:26 +0100 Rui Sá wrote
in Message id: : On Fri, 21 Jun 2013 13:07:38 -0700 (PDT), wrote: Hi, I got a broken old pc. It is a challange to fix it for me. There is a hdd with an unix system and with a special software. it is a parth of a machine for industry. It seems taht thw sw is connected with a hardware on the computer. I am looking for details information about this motherboard http://i40.tinypic.com/2lmmfiq.jpg Yes, it is little bit out of date. Does anyone know a detailed information or a shop who can sell this type of mb? There's a Cyrix CX-83D87-33 math coprocessor (compatible with Intel's 80387) on that board, so I'd say it's an i386 mobo, running at 33 MHz. Can't be - if you magnify the empty socket you'll see it's marked socket 3 which was for the i486. http://en.wikipedia.org/wiki/Socket_3 You DO know there's no CPU on that board (it's the empty socket on the top-right), don't you? And that it can't work without a CPU? And it only has one SIMM (memory module) installed: I think it probably needs all four SIMMs to work. What do you make of that weird slot? |
Looking for oldschool mother board
On Fri, 28 Jun 2013 06:09:54 -0400, Trent .****off
wrote: On Thu, 27 Jun 2013 16:44:26 +0100 Rui Sá wrote in Message id: : On Fri, 21 Jun 2013 13:07:38 -0700 (PDT), wrote: Hi, I got a broken old pc. It is a challange to fix it for me. There is a hdd with an unix system and with a special software. it is a parth of a machine for industry. It seems taht thw sw is connected with a hardware on the computer. I am looking for details information about this motherboard http://i40.tinypic.com/2lmmfiq.jpg Yes, it is little bit out of date. Does anyone know a detailed information or a shop who can sell this type of mb? There's a Cyrix CX-83D87-33 math coprocessor (compatible with Intel's 80387) on that board, so I'd say it's an i386 mobo, running at 33 MHz. Can't be - if you magnify the empty socket you'll see it's marked socket 3 which was for the i486. Yes indeed, it's a 237-pin socket, which is not compatible with the i386, which has 132 pins. However, what's the Cyrix CX-83D87-33 coprocessor doing on that board, as I don't think it's compatible with any 486 CPU: the i486DX included its own FPU (faster than the 80387) so there won't even be a socket for a coprocessor on its motherboard. The cheaper i486SX lacked the FPU and some boards included a socket to add a math coprocessor later but AFAIAA it was only compatible with the i487SX, which is the same size as the i486SX itself. This board not only has a socket for a coprocessor (which means it came with an i486SX), but it's smaller than the i487SX socket and has installed an 80387-compatible FPU and probably some special logic to make it work (asynchronously?) with the i486SX, making it clearly slower than a full i486DX for FPU operations. Were the savings worth the effort, the extra logic and the slower FPU speed?... [...] What do you make of that weird slot? That's most likely a VLB slot (VESA Local Bus): http://en.wikipedia.org/wiki/VESA_Local_Bus The left part is just an ISA slot. This was a very popular slot for video cards before PCI became common, specially in later 486 systems. -- To reply by email please remove .no.spam from the supplied address |
Looking for oldschool mother board
On 28/06/2013 4:23 PM, Rui Sá wrote:
Yes indeed, it's a 237-pin socket, which is not compatible with the i386, which has 132 pins. However, what's the Cyrix CX-83D87-33 coprocessor doing on that board, as I don't think it's compatible with any 486 CPU: the i486DX included its own FPU (faster than the 80387) so there won't even be a socket for a coprocessor on its motherboard. The cheaper i486SX lacked the FPU and some boards included a socket to add a math coprocessor later but AFAIAA it was only compatible with the i487SX, which is the same size as the i486SX itself. Oh yes, this is bringing back some major old-school memories. The 486SX was a 486DX with its onboard coprocessor disabled. Intel then sold a 487SX "coprocessor", which was in reality a fully-functional 486DX which then disabled the original 486SX, and took over all processing functions from it, including the CPU & FPU. You basically had a dual-processor board where one processor got disabled. However, this was not the only way to get back FPU functionality back on a 486SX. Some people engineered around Intel's 487SX socket design and instead put a 387 socket on the motherboard. It's possible to attach a 387 FPU copro on the 486SX, since the CPU and FPU were asynchronously attached. The coprocessor could be clocked separately from (& usually lower than) the CPU, since the days of the 386. I remember that I had once attached a 287 coprocessor to a 386DX CPU, so the ability to do something similar was still available on the 486 generation. A 387 copro was not nearly as fast as the internal FPU on a 486DX or 487SX, but it served its purpose. This board not only has a socket for a coprocessor (which means it came with an i486SX), but it's smaller than the i487SX socket and has installed an 80387-compatible FPU and probably some special logic to make it work (asynchronously?) with the i486SX, making it clearly slower than a full i486DX for FPU operations. Were the savings worth the effort, the extra logic and the slower FPU speed?... Well, things were very expensive back then, so a lot of cheapskates may have taken any opportunities save some bucks. The cost differential from buying a full 486DX could've been more than buying a 486SX with a 387 copro; and certainly much better than buying a 486SX + 487SX combo which was the ultimate waste of money, since it completely disables a perfectly fine CPU. Yousuf Khan |
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