Can not find any info, need an FCC ID. Appears missing two PALS and BIOS (would be needed for support of two floppy ports on older systems).
Here is the SMC datasheet..

Horun wrote on 2023-03-23, 23:21:

Can not find any info, need an FCC ID. Appears missing two PALS and BIOS (would be needed for support of two floppy ports on older systems).
Here is the SMC datasheet..

No FCC ID either. It's interesting there's no information out there for this, and missing those chips. It looks almost unused and came in an SMC bag which may or may not be original. Looks like I'll be reverse engineering this one. At least the big chip has a datasheet. And I paid little for it.

Good luck ! You can start with the serial ports, from datasheet PSPIRQ and SSPIRQ are Com1 and Com2. They should go to a 3 pin jumper to set IRQ 3 or 4.
Using the pinout and descipts (pg 4-18) and then from pg 128-130 for the 666GT hardware config might get you started...
Am sure you would have found that already..

eesz34 wrote on 2023-03-24, 01:46:

Horun wrote on 2023-03-23, 23:21:

Can not find any info, need an FCC ID. Appears missing two PALS and BIOS (would be needed for support of two floppy ports on older systems).
Here is the SMC datasheet..

No FCC ID either. It's interesting there's no information out there for this, and missing those chips. It looks almost unused and came in an SMC bag which may or may not be original. Looks like I'll be reverse engineering this one. At least the big chip has a datasheet. And I paid little for it.

Closest I got on wayback was the attached, and I'm not even sure what it is (.lib / .sch files - some kind of schematic??) but the date seems about right (autumn 93) and if you open the .sch files in a hex editor, many of the components / pin blocks seem to be referenced by name. Still might be nothing, but above my pay grade to make any more reasoned calls than that!

Epic TIP: use google lens.

Horun wrote on 2023-03-24, 04:19:

Good luck ! You can start with the serial ports, from datasheet PSPIRQ and SSPIRQ are Com1 and Com2. They should go to a 3 pin jumper to set IRQ 3 or 4.
Using the pinout and descipts (pg 4-18) and then from pg 128-130 for the 666GT hardware config might get you started...
Am sure you would have found that already..

After having to use 1,000+ page datasheets for microcontrollers this is easy. It'll be a little tedious is all, but it's really only the jumpers I need to trace out.

PC Hoarder Patrol wrote on 2023-03-24, 04:29:

Closest I got on wayback was the attached, and I'm not even sure what it is (.lib / .sch files - some kind of schematic??) but the date seems about right (autumn 93) and if you open the .sch files in a hex editor, many of the components / pin blocks seem to be referenced by name. Still might be nothing, but above my pay grade to make any more reasoned calls than that!

sio6xxe.zip

Wow, how did you find that? It is indeed a schematic file and the library file for custom components used on the design, OrCAD 4.10 to be exact. I'm still trying to figure out/get a copy of OrCAD working so I can view it, but I can't even find that file on Wayback Machine or the main search on archive.org.

I won't be sure it's for this card until I can open it in OrCAD but looking through the readable text makes me feel optimistic. And the SMC sticker on the static bag, lack of other identification, and missing EPROM/PALs makes me wonder if it's a reference design for the SMC main chip.

dj_pirtu wrote on 2023-03-24, 06:57:

Epic TIP: use google lens.

I thought about searching on Google images, but that rarely gets me anything useful.

eesz34 wrote on 2023-03-24, 20:10:

PC Hoarder Patrol wrote on 2023-03-24, 04:29:

Closest I got on wayback was the attached, and I'm not even sure what it is (.lib / .sch files - some kind of schematic??) but the date seems about right (autumn 93) and if you open the .sch files in a hex editor, many of the components / pin blocks seem to be referenced by name. Still might be nothing, but above my pay grade to make any more reasoned calls than that!

sio6xxe.zip

Wow, how did you find that? It is indeed a schematic file and the library file for custom components used on the design, OrCAD 4.10 to be exact. I'm still trying to figure out/get a copy of OrCAD working so I can view it, but I can't even find that file on Wayback Machine or the main search on archive.org.

I won't be sure it's for this card until I can open it in OrCAD but looking through the readable text makes me feel optimistic. And the SMC sticker on the static bag, lack of other identification, and missing EPROM/PALs makes me wonder if it's a reference design for the SMC main chip.

Came across it doing a partial text search of all the 1990s URL links Wayback has archived for smc.com...the actual link is here - https://web.archive.org/web/19970715072203/ht … sch/sio6xxe.zip

PC Hoarder Patrol wrote on 2023-03-24, 20:36:

Came across it doing a partial text search of all the 1990s URL links Wayback has archived for smc.com...the actual link is here - https://web.archive.org/web/19970715072203/ht … sch/sio6xxe.zip

Great Work ! You have an incredible talent/smarts when it comes to archive searching. Thanks ! Noticed there are other schems there and some bios files a layer or so up.
Found some old versions of Orcad and will try to load it up <on an old 486> and make screen shots/create .jpg off it if I can this weekend.

Horun wrote on 2023-03-24, 23:28:

PC Hoarder Patrol wrote on 2023-03-24, 20:36:

Came across it doing a partial text search of all the 1990s URL links Wayback has archived for smc.com...the actual link is here - https://web.archive.org/web/19970715072203/ht … sch/sio6xxe.zip

Great Work ! You have an incredible talent/smarts when it comes to archive searching. Thanks ! Noticed there are other schems there and some bios files a layer or so up.
Found some old versions of Orcad and will try to load it up <on an old 486> and make screen shots/create .jpg off it if I can this weekend.

Now you convinced me to look through that URL more. And I'm also working on viewing this in an old OrCAD, but am having a hell of a time getting anything to work. If I'm successful I'll also report back here.

EDIT: finally got something working! I just have to figure out how to select a higher resolution video driver and how to load in the SMC provided library. And yes, the reference designators do match the card! Amazing!

What version of orcad are you using ? Tried v6 and v7 but they complain about a missing SDT.CFG when opening the .sch. V7 did open the .lib and converted it to a readable .OLB file.
Can you export/save the .sch as a .dsn ? If so then you should be able to open it in a Win9x version w/o error. Will try v4.4 and see if it can work OK, supposedly has driver for up to 1280 mode VGA....

Horun wrote on 2023-03-25, 17:56:

What version of orcad are you using ? Tried v6 and v7 but they complain about a missing SDT.CFG when opening the .sch. V7 did open the .lib and converted it to a readable .OLB file.
Can you export/save the .sch as a .dsn ? If so then you should be able to open it in a Win9x version w/o error. Will try v4.4 and see if it can work OK, supposedly has driver for up to 1280 mode VGA....

I'm using 4.20, which is the closest I could get to the version the schematic was created in which is supposedly 4.10. Now, I also dropped to DOS 5.0 because I had a lot of trouble getting through installation in 6.22. Don't know if that is a real issue or not. But the installer would get to a disk and complain about not being able to find files in the disk image that were obviously there. I also switched to PCem so I could use a specific video device (ET4000 in my case) as that was supported by OrCAD. It supports lots of video cards though.

I tried version 6 or 7 in Windows 3.11 and it generated some error when trying to load the .sch. It was Ok with the .lib.

This is one confusing program, but probably not much different than many of the modern PCB layout applications. Not intuitive anyway. I don't see how to save. Copy the .lib into c:\orcadesp\sdt\library, and the configuration file is in c:\orcad\template\sdt.cfg. That's where I set the video driver.

I will try some more with this, but mainly I want to determine the jumper settings which will be easier now. ET4000 is in, I think 1024x768.

eesz34 wrote on 2023-03-25, 22:45:

I'm using 4.20, which is the closest I could get to the version the schematic was created in which is supposedly 4.10. Now, I al […]
Show full quote

I'm using 4.20, which is the closest I could get to the version the schematic was created in which is supposedly 4.10. Now, I also dropped to DOS 5.0 because I had a lot of trouble getting through installation in 6.22. Don't know if that is a real issue or not. But the installer would get to a disk and complain about not being able to find files in the disk image that were obviously there. I also switched to PCem so I could use a specific video device (ET4000 in my case) as that was supported by OrCAD. It supports lots of video cards though.

I tried version 6 or 7 in Windows 3.11 and it generated some error when trying to load the .sch. It was Ok with the .lib.

This is one confusing program, but probably not much different than many of the modern PCB layout applications. Not intuitive anyway. I don't see how to save. Copy the .lib into c:\orcadesp\sdt\library, and the configuration file is in c:\orcad\template\sdt.cfg. That's where I set the video driver.

I will try some more with this, but mainly I want to determine the jumper settings which will be easier now. ET4000 is in, I think 1024x768.

Great ! Hey inside 66xsch.zip from smc site is another set of schematics and a file called JUMPERS.66X (43k), using hex edit look at it and it has a zip header, opened with 7z and set of schems plus another file called jumpers.66x (6k) and is a text file.
It lists the jumpers and what they are. Attached. Should compare to the Orcad file ok and appears ok looking at your card on quick inspection.
edit: added a edited pic of your card

Horun wrote on 2023-03-26, 00:20:

Great ! Hey inside 66xsch.zip from smc site is another set of schematics and a file called JUMPERS.66X (43k), using hex edit look at it and it has a zip header, opened with 7z and set of schems plus another file called jumpers.66x (6k) and is a text file.
It lists the jumpers and what they are. Attached. Should compare to the Orcad file ok and appears ok looking at your card on quick inspection.
edit: added a edited pic of your card

Oh cool, I was looking for a jumper reference. I found that same file but didn't know what it was because of its weird extension. I will certainly be studying this. Interesting though, neither schematic has JP25 or JP26, although the card and jumper reference has it. Time to trace some connections.

eesz34 wrote on 2023-03-26, 02:39:

Oh cool, I was looking for a jumper reference. I found that same file but didn't know what it was because of its weird extension. I will certainly be studying this. Interesting though, neither schematic has JP25 or JP26, although the card and jumper reference has it. Time to trace some connections.

If you figure out where they go/what they do and post it here will add it (with your picture, the text, the datasheet, the schems) to our driver library with creds to you, PC Hoarder and a link to here for the work involved if that is ok.

Horun wrote on 2023-03-26, 03:49:

eesz34 wrote on 2023-03-26, 02:39:

Oh cool, I was looking for a jumper reference. I found that same file but didn't know what it was because of its weird extension. I will certainly be studying this. Interesting though, neither schematic has JP25 or JP26, although the card and jumper reference has it. Time to trace some connections.

If you figure out where they go/what they do and post it here will add it (with your picture, the text, the datasheet, the schems) to our driver library with creds to you, PC Hoarder and a link to here for the work involved if that is ok.

Sure thing. It might take me some time but I'll report back here.

JP25 & JP26 are both 2x4 8pin blocks. makes me think they might be for selecting a dma channel, possibly for the ECP parallel port.

edit: from looking at the jumper text file, it's either 4 floppy support or (2 floppy & ECP printer port)
I'm unable to identify if the parallel port works in 4 floppy support mode.

eesz34 wrote on 2023-03-26, 19:29:

Sure thing. It might take me some time but I'll report back here.

weedeewee wrote on 2023-03-26, 21:08:

JP25 & JP26 are both 2x4 8pin blocks. makes me think they might be for selecting a dma channel, possibly for the ECP parallel port.

edit: from looking at the jumper text file, it's either 4 floppy support or (2 floppy & ECP printer port)
I'm unable to identify if the parallel port works in 4 floppy support mode.

It looks like if LPT is set standard or EPP mode then 4 floppy support does exist (JP6/JP11 and if jp12/Jp14 set proper), def not ECP.
There is a 4 floppy driver for the 661 which is probably the reason for "* indirect 4 Drive support, contact factory", it could be same driver....
Another thing would be good to know is where JP27 and JP28 run to. JP27 could be a backplate ground jumper but JP28 is a mystery, though like JP21 could be related to if ROM is installed.....