Hello everyone, I'm having trouble finding an isa riser for my old 286. It's a philips pcd 200, I remember there was a isa riser with 2 slots, but probably it wasn't a standard card. Anyone know if there is a riser for this type of slots? Thanks!
For one thing, you can check the pins to see if it is compatible with 16 bit ISA slot or not.
A-Trend ATC-1020 V1.1 ❇ Cyrix 6x86 150+ @ 120MHz ❇ 32MiB EDO RAM (8MiBx4) ❇ A-Trend S3 Trio64V2 2MiB
Aztech Pro16 II-3D PnP ❇ 8.4GiB Quantum Fireball ❇ Win95 OSR2 Plus!
Rider_in_the_Blue wrote on 2024-05-09, 20:25:Hello everyone, I'm having trouble finding an isa riser for my old 286. It's a philips pcd 200, I remember there was a isa riser with 2 slots, but probably it wasn't a standard card. Anyone know if there is a riser for this type of slots? Thanks!
I've come across multiple copies of a riser card like the one shown in this thread: Price of this ISA hub? - one of them in a 286 case that had likely been sold by ESCOM around 1989, the other one as lone component. The prices on ebay I currently see for pure ISA riser cards like that one are absurd, though.
The riser looks like: http://oldcomputer.info/pictures/gal/Museum/P … _PCD200/013.jpg
Not sure what that 26pin header is for. The Floppy and HD connector is on the mainboard (pic 10).
It is very possible that a standard 2 x 16 bit riser will work but would need to check the riser socket pinout...there are none on ebay I can find at this time....but there is 4 slot ones which could be cut down
https://i.ebayimg.com/images/g/HGMAAOSw9MRmA4-q/s-l1600.webp
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun
Horun wrote on 2024-05-11, 15:39:The riser looks like: http://oldcomputer.info/pictures/gal/Museum/P … _PCD200/013.jpg Not sure what that 26pin header is for. Th […]
The riser looks like: http://oldcomputer.info/pictures/gal/Museum/P … _PCD200/013.jpg
Not sure what that 26pin header is for. The Floppy and HD connector is on the mainboard (pic 10).
It is very possible that a standard 2 x 16 bit riser will work but would need to check the riser socket pinout...there are none on ebay I can find at this time....but there is 4 slot ones which could be cut down
https://i.ebayimg.com/images/g/HGMAAOSw9MRmA4-q/s-l1600.webp
Yes, I found that site too, it's the exact same model of my pc. I tried to find an email to contact that guy, but on his website there is no way to contact him (I would ask him if there's a s/n or a brand on the other side of the card).
I don't know if that riser on ebay is compatible, on the mb I've two 16bits slot, that card has 1 16 bit and 1 8 bit. thanks anyway
You do not understand what we have been hinting at. We know your has two 31 pin "8bit" sections of socket. The one closest to back of the case would be the standard 8bit A and B 31 pin part. The other is split looking at that riser picture with the C and D 18pin part to the 16 bit section (standard method), the other C and D 13 pins going to a header. I bet a standard ISA riser would work inserted toward the back of the case.
I would use an ohmmeter and check the boards slot for PSU lines and ground to the red line from the back and see if it matches, it is does then should be no issue trying a standard riser.
https://en.wikipedia.org/wiki/Industry_Standard_Architecture or https://old.pinouts.ru/Slots/ISA_pinout.shtml
Do you know what that 26 pin header is for ? It might be for the external 5.25" floppy drive as per the http://oldcomputer.info/gallery.php?p=Museum/ … /Philips_PCD200
picture of the back, or could be for some other "expansion".
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun
Horun wrote on 2024-05-14, 02:47:You do not understand what we have been hinting at. We know your has two 31 pin "8bit" sections of socket. The one closest to ba […]
You do not understand what we have been hinting at. We know your has two 31 pin "8bit" sections of socket. The one closest to back of the case would be the standard 8bit A and B 31 pin part. The other is split looking at that riser picture with the C and D 18pin part to the 16 bit section (standard method), the other C and D 13 pins going to a header. I bet a standard ISA riser would work inserted toward the back of the case.
I would use an ohmmeter and check the boards slot for PSU lines and ground to the red line from the back and see if it matches, it is does then should be no issue trying a standard riser.
https://en.wikipedia.org/wiki/Industry_Standard_Architecture or https://old.pinouts.ru/Slots/ISA_pinout.shtml
Do you know what that 26 pin header is for ? It might be for the external 5.25" floppy drive as per the http://oldcomputer.info/gallery.php?p=Museum/ … /Philips_PCD200
picture of the back, or could be for some other "expansion".
Oh, now I understand! Sorry, I thought the riser couldn't be shorter than a 16 bit. I don't know what the header is for, the 5.25 is on the back of the case and is connected with an IDE cable to the floppy header not to that. I'm gonna search for a standard riser with two slots and see what I can do. Thanks!
Great ! Makes sure the computer runs OK as it is. Adding that riser will not fix a problem, it only allows adding things like sound card.
added: good luck finding a low profile 2 ISA type. The original is a rare one you will probably never see unless someone parts out a PCD-200
Since yours has the Ext. floppy part my next guess is that 26pin header is for a second COM port <just a guess>
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun
After almost two years, I’m back with an update! In the meantime, the guy from oldcomputer.info was kind enough to send me photos of both the front and the back of the original board. I’m attaching them below. At this point, I would really like to try to recreate a board identical. Could anyone help me understand: how to derive the schematic starting from these photos? whether there are tools that can help reconstruct the PCB from images (reverse engineering)? where I should begin to replicate it properly?
Any suggestions are very welcome.
Thanks again to everyone for the help!
