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r_fostoria
March 16th, 2016, 07:32 PM
Hello all. A few years ago, a local business was closing down and I managed to get my hands on an old IBM AT 5170 that they going to throw away. It was an exciting find, and even included the original manuals and introduction/setup disks, but I was disappointed to find, when I got it home, that the BIOS battery had exploded at some point and leaked all over the motherboard. Anyway, just this week I finally got around to buying a replacement board and fixing it. It now boots up just fine, but I have two questions:


The computer has 2x Rodime R0202e hard disk drives. However, the setup is asking for the type number and I simply cannot find the information to determine this number. Does anyone out there have one of these things and know what type it is, or at least what the specs are so I can look it up?



How should I go about replacing the BIOS battery? Is a modern unit swapable?

offensive_Jerk
March 16th, 2016, 07:43 PM
The computer has 2x Rodime R0202e hard disk drives. However, the setup is asking for the type number and I simply cannot find the information to determine this number. Does anyone out there have one of these things and know what type it is, or at least what the specs are so I can look it up?


http://www.minuszerodegrees.net/5170/hdd_type/5170_hdd_type.htm



How should I go about replacing the BIOS battery? Is a modern unit swapable?

http://www.minuszerodegrees.net/5170/battery/5170_battery.htm

SomeGuy
March 16th, 2016, 07:58 PM
According to this list: http://umich.edu/~archive/atari/8bit/Info/Hardware/mioman.txt the R0202E is a 20mb drive with 4 heads and 640 cylinders. Which is not one of the pre-defined AT types.

What hard disk controller is in this system? Does that controller have its own BIOS?

Did the old motherboard have a standard IBM BIOS in it, or was it custom?

ArchieX
March 17th, 2016, 02:22 AM
Just to chime in with regards to the BIOS battery, I have use the four AA-cell method myself in my 5170 for atleast 12 years and can confirm it works perfectly. I just changed the batteries out recently after perhaps six years and the BIOS settings were still retained. I recommend using good-quality batteries such as Duracell or Energizer, as cheaper brands would probably start leaking a lot sooner.

r_fostoria
March 17th, 2016, 03:41 PM
According to this list: http://umich.edu/~archive/atari/8bit/Info/Hardware/mioman.txt the R0202E is a 20mb drive with 4 heads and 640 cylinders. Which is not one of the pre-defined AT types.

What hard disk controller is in this system? Does that controller have its own BIOS?

Did the old motherboard have a standard IBM BIOS in it, or was it custom?

The hard drive controller is a WD1003-GRY, but that's really all I know to tell you about it. Here's a picture of it:

30176

offensive_Jerk
March 17th, 2016, 03:55 PM
My new 6v battery came today. I soldered the correct plug on.

So far, so good.
30177

r_fostoria
March 17th, 2016, 03:58 PM
My new 6v battery came today. I soldered the correct plug on.

So far, so good.
30177

Very cool! Do you know if it's possible to find a replacement plug? I'm sure there are generic solutions out there.

SpidersWeb
March 17th, 2016, 04:10 PM
Very cool! Do you know if it's possible to find a replacement plug? I'm sure there are generic solutions out there.

Standard CDROM audio cable (https://www.google.com/search?site=&tbm=isch&source=hp&biw=1406&bih=911&q=CDROM+audio+cable&oq=CDROM+audio+cable&gs_l=img.3..0i10i30.944.2518.0.2677.17.9.0.0.0.0.3 02.1004.2-3j1.4.0....0...1ac.1.64.img..13.4.1004.oshGDLS7zO8 ). Just snip it in half.
Can probably get them from electronics stores etc or ebay, but heck, usually not hard to find one of those laying around unused from some dead modern-ish PC.

SomeGuy
March 17th, 2016, 05:14 PM
The hard drive controller is a WD1003-GRY, but that's really all I know to tell you about it. Here's a picture of it:

30176
Physically that looks like the same card Modem7 describes here:
http://www.minuszerodegrees.net/5170/cards/5170_cards.htm#fddda_2

The LLF instructions indicate it is dependent on the AT BIOS.

Which probably means this drive was formatted as a type 2 or type 6, making use of only 615 cylinders.

Did the old AT motherboard have original IBM ROMs in it?

offensive_Jerk
March 17th, 2016, 05:35 PM
Very cool! Do you know if it's possible to find a replacement plug? I'm sure there are generic solutions out there.


Or snip the led or power button leads off of an old computer case, but then you better make sure you get the polarity correct when you plug it into the board since the connector won't be keyed that way.

I measured my old battery after I replaced it, and it only measured one volt, lol. Must have been enough to keep the bios settings, but not enough to keep the clock running.