Hi all,
I just picked up an Osborne 1 and it's a lot different from most that I've seen on the internet. It seems to have an early serial number but on the screen it says OZROM 1E #00187 (c) 1984 Micro Management.
I assume this is because it appears to have the 80 column upgrade. It also has the double density upgrade. The keyboard is connected with a ribbon cable rather than the coiled cable.
Turn I turn it on, both drives flash briefly and the screen constantly flickers "Slip disk in drive and press RETURN" as if a key is being held down and it keeps refreshing until enter is pressed. I took the keyboard apart by removing a screen on either side next to the clamp location, then removed 4 screws that hold the keyboard onto the riser.
All the internal cables look secure and I pressed all the keys several times to make sure none of them were stuck. If I turn the computer on, then the image is static and not flickering and the graphics change periodically while waiting for return.
So first question: Any idea what I can do to fix this issue?
Next, taking it apart, I removed 2 screws either side of the handle, maybe 5-6 around the power supply. There were 7 on the front bezel, one at the bottom, two at the top and 2 on each side. Inside I had to remove 4 (well 3, one was missing) that held the internal chassis to the internal frame then I had to slide the whole thing forward. I probably should have done it upside down side the weight of the CRT started to bend the motherboard.
At this point, since I'm going to eventually add the gotek, I removed the motherboard which and did a RIFA check on the power supply. The two large caps next to each other look a little bulged so I'll probably remove those and replace the RIFAs too. You never forget your first RIFA
Second question: Any recommendation for replacement caps? I know modern components are much better than 80's so should I use that same voltage and capacitance?
Since I'm going to put the gotek into the B drive slot, I'll remove it and keep it safe. The A drive I'll remove and lube and clean the heads while it's out.
Third Question: is there anything else I should look at before putting it all back together?
I did find a service manual and it seems I have an original style bezel, looking at the disassembly instructions.
I'm hopeful that some knowledgable Osborne 1 people are here who can assist.
Thanks,
I just picked up an Osborne 1 and it's a lot different from most that I've seen on the internet. It seems to have an early serial number but on the screen it says OZROM 1E #00187 (c) 1984 Micro Management.
I assume this is because it appears to have the 80 column upgrade. It also has the double density upgrade. The keyboard is connected with a ribbon cable rather than the coiled cable.
Turn I turn it on, both drives flash briefly and the screen constantly flickers "Slip disk in drive and press RETURN" as if a key is being held down and it keeps refreshing until enter is pressed. I took the keyboard apart by removing a screen on either side next to the clamp location, then removed 4 screws that hold the keyboard onto the riser.
All the internal cables look secure and I pressed all the keys several times to make sure none of them were stuck. If I turn the computer on, then the image is static and not flickering and the graphics change periodically while waiting for return.
So first question: Any idea what I can do to fix this issue?
Next, taking it apart, I removed 2 screws either side of the handle, maybe 5-6 around the power supply. There were 7 on the front bezel, one at the bottom, two at the top and 2 on each side. Inside I had to remove 4 (well 3, one was missing) that held the internal chassis to the internal frame then I had to slide the whole thing forward. I probably should have done it upside down side the weight of the CRT started to bend the motherboard.
At this point, since I'm going to eventually add the gotek, I removed the motherboard which and did a RIFA check on the power supply. The two large caps next to each other look a little bulged so I'll probably remove those and replace the RIFAs too. You never forget your first RIFA
Second question: Any recommendation for replacement caps? I know modern components are much better than 80's so should I use that same voltage and capacitance?
Since I'm going to put the gotek into the B drive slot, I'll remove it and keep it safe. The A drive I'll remove and lube and clean the heads while it's out.
Third Question: is there anything else I should look at before putting it all back together?
I did find a service manual and it seems I have an original style bezel, looking at the disassembly instructions.
I'm hopeful that some knowledgable Osborne 1 people are here who can assist.
Thanks,