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isa-d
Joined: 16 Aug 2006
Posts: 2984
Location: Italy
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 Posted: Sun Jan 18, 2015 11:50 am Post subject: NEC board |
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Someone has never seen one board like this?
it's a NEC board, seem to be a PC board with 2 x PS2, 1 x Serial, 1 x SCSI, 1 x Parallel, 1 x VGA
small chip has the same layout like V70 (bigger it't to big to be a V series) |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Sun Jan 18, 2015 12:07 pm Post subject: |
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| Can it be a NEC V80? |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Sun Jan 18, 2015 1:24 pm Post subject: |
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big ones are standard packages for NEC gate arrays too
I kinda wonder if it isnt just a V20/V30 on the 40 pin DIP, with a 8087 socket next to it
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Robev
Joined: 10 Mar 2006
Posts: 3693
Location: New Zealand
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| Posted: Sun Jan 18, 2015 2:37 pm Post subject: |
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Looking at the board I am wondering if it may have come out of an early Portable or Laptop Computer.
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isa-d
Joined: 16 Aug 2006
Posts: 2984
Location: Italy
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| Posted: Sun Jan 18, 2015 2:49 pm Post subject: |
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| CPUShack wrote: | big ones are standard packages for NEC gate arrays too
I kinda wonder if it isnt just a V20/V30 on the 40 pin DIP, with a 8087 socket next to it |
Seller has a similar board with the same 3 big ceramic chips but no DIPs
I'm confused if risk some money for one of them
they come from Japan and I don't have a way to ask about part numbers or better pictures |
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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Birdman.
Joined: 13 Nov 2012
Posts: 833
Location: Finland
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| Posted: Sun Jan 18, 2015 4:19 pm Post subject: |
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That second one looks like laptop board indeed with empty space left for floppy drive (or HDD) and connector for external power supply. ISA slot on that first board looks odd for laptop, though.
Still, it's possible that CPUs are Vxx in some of those smaller DIP and QFP, and those larger PGAs are just chipset and graphics, possibly just gate arrays. I'm wondering why that second board seems to have three sets of memory chips: one should be RAM for CPU, maybe other for graphics but what's that third set? Maybe it's not memory after all or there's some unusual functions on that board like a lot of ROM. |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Sun Jan 18, 2015 4:28 pm Post subject: |
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| There is possibility that third ram set is for the audio chip. |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Sun Jan 18, 2015 4:54 pm Post subject: |
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This second board is from NEC PC-98 laptop family,
they share exactly the same connectors order.
Probably PC-9801N (based on V30) or NV (based on V30HL).
CPU is between RAM sets. |
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kosmokrator
Joined: 03 Jul 2008
Posts: 4085
Location: Athens-GR
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| Posted: Sun Jan 18, 2015 6:00 pm Post subject: |
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| One is sure......Pretty Boards! |
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Robev
Joined: 10 Mar 2006
Posts: 3693
Location: New Zealand
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| Posted: Sun Jan 18, 2015 6:23 pm Post subject: |
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| Birdman. wrote: | That second one looks like laptop board indeed with empty space left for floppy drive (or HDD) and connector for external power supply. ISA slot on that first board looks odd for laptop, though.
Still, it's possible that CPUs are Vxx in some of those smaller DIP and QFP, and those larger PGAs are just chipset and graphics, possibly just gate arrays. I'm wondering why that second board seems to have three sets of memory chips: one should be RAM for CPU, maybe other for graphics but what's that third set? Maybe it's not memory after all or there's some unusual functions on that board like a lot of ROM. |
ISA Slot on 1st board is probably for a Modem Card or Network Card or a backplane for them
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Mizutsuki Raki
Joined: 23 Mar 2014
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Location: Seoul, Korea
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| Posted: Sun Jan 18, 2015 9:44 pm Post subject: |
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Second one is must be PC-98 series laptop with HDD.
I have PC-9801 nv, but the layout is different. |
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isa-d
Joined: 16 Aug 2006
Posts: 2984
Location: Italy
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| Posted: Mon Jan 19, 2015 11:45 am Post subject: |
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| thanks to all for the replies |
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