From Newsgroup: comp.sys.ibm.ps2.hardware
On Friday, November 18, 2022 at 9:50:43 AM UTC-5, Louis Ohland wrote:
Oh. Once again, contemporaneous articles use the then-correct name.
PC386SX/MC20 (20 in subscript)
Teapo 175W PSU, "custom designed" "dual voltage", US and european,
assume 120/220
3x SIMMs, 70nS supporting zero wait states.
System RAM arrangement "Page-Mode", "Interleaved" is not in table for
the 3241.
"Page Mode memory allows back-to-back memory accesses within blocks of memory called pages, avoiding wait states."
Shadowing is permanently enabled for video BIOS. Video performance was
very good.
Louis Ohland wrote:
https://books.google.com/books?id=l3Z0ZgEexGEC&pg=PT172&lpg=PT172&dq=%22PC386sx/MC%22&source=bl&ots=_8kKkNSTOt&sig=ACfU3U38_mWrRNTveMMy1ty7r79VaKASwg&hl=en&sa=X&ved=2ahUKEwie-5D4m7b7AhUokIkEHbdkAm8Q6AF6BAgmEAM#v=onepage&q=%22PC386sx%2FMC%22&f=false
Starts on page 157 (not physical)
Louis Ohland wrote:
Dave, I see the YouToo video, did you get good filthy-feely pics of
the system board?
It's not klar how or if there is a 486 upgrade for this. A 16-bit 486?
Possumble, but kontuzing.
You bare it, we'll share it...
Louis Ohland wrote:
77c22(e) this one IIRC is sordid a mystery chip, but NCR has drivers. >>> 53C90 SCSI, I think...
Louis Ohland wrote:
NCR System 3300 Class 3421
Thought this was a classless society...
3421 (Micro Channel i386) System Software
https://www5.ncr.com/support/support_drivers_patches.asp?Class=pc_library_3421
3421 Reference Disk 1 of 1 ver 2.00
http://www3.ncr.com/support/pc/pcfiles/Machines/34xx/3421/3421_REF.EXE >>>>
Binary code file to make BIOS v.2.00 for 3421
http://www3.ncr.com/support/pc/pcfiles/Machines/34xx/3421/3421_200.EXE >>>>
http://ps-2.kev009.com/mcabase/mcb/adp/adf/@7F4D.ADF
Wow, looks pretty flexible and capable.
https://www.ardent-tool.com/adapters/adf/@5608.adf
Nothing mind-shattering
Errata, nothing huge
1x 16-bit AVE slot
3x 16-bit MCA
Power connector could be for a 50/70 style PSU, -OR- like the Model >>>> 90 PSU with the edge card socket. I dunno.
Looks to be two "SIMMs" worth of memory soldered to the board,
unknown size. But each "SIMM" has 8 chips, plus 4 smaller chips. My >>>> SWAG is 8x data, 4x parity.
"i486 upgrade board" Do tell...
Lubo wrote:
https://theretroweb.com/motherboards/s/ncr-class-3421
This is an NCR system with MCA slots, 386 SX.
What makes it interesting is it has SCSI on the motherboard, with >>>>> both internal and external connections, the maximum RAM (8Mb), and >>>>> a Cabletron Ethernet card with the standard RJ-45 jack and a
working Conner Hard drive.
I modified the onboard VGA connector, adding an opening on pin 9 on >>>>> the second row, so current VGA cables fit now, no custom cabling
needed.
It boots, displays POST info including that it detects 8Mb RAM, and >>>>> has DOS 6.22 and Windows 3.0 installed, though I commented windows >>>>> and the antivirus out of autoexec.bat because they run glacially
slow. They can be enabled by uncommenting or run manually by typing >>>>> win. The SCSI and ethernet have the ADF files installed. @7F4D for >>>>> SCSI and @5608 for Ethernet, which has a RJ-45 jack. I managed to >>>>> install a packet driver, and DOS based DHCP, and it got an IP
address, and pinged briefly, but then stops. It appears the
hardware works and it is a software problem.
These were used as POS terminals back in the day, but would work
fine for retro-computing DOS games or (very slowly) Windows 3.x. I >>>>> also read they take OS/2 up to version 2.0 but have not tested.
I am in the Los Angeles area, in case anyone wants to pick it up, >>>>> since these older models are all metal, so shipping might cost more >>>>> than the computer at this point.
Ok I would like this system
I'm at richard.smice @ yahoo.com please advise about shipping costs
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