I just opened one of my 1050 disk drives and found these inside:
![P3300013.JPG]()
![P3300014.JPG]()
![P3300016.JPG]()
it looks different from all my other 1050s in the following ways:
- Voltage regulators mounted upside down and have long cables attached to the pins going to different places on the mobo than all my other 1050s. Apparently this is a different design on the Atari's part as the mobo and some other components also look different.
- There is a mod (several wires on the SIO connectors and towards the middle of the mobo, one trace is cut) I have no idea what this has been done for?
- Also this mobo has 2 jumper bridges instead of 4. IIRC, that is something that affects which US Doubler chip should be used if installed.
- There is an EPROM instead of a ROM for the Tendon chip with an original ATARI label on it. Looks like Atari used EPROMS in some of the 1050s?
it looks different from all my other 1050s in the following ways:
- Voltage regulators mounted upside down and have long cables attached to the pins going to different places on the mobo than all my other 1050s. Apparently this is a different design on the Atari's part as the mobo and some other components also look different.
- There is a mod (several wires on the SIO connectors and towards the middle of the mobo, one trace is cut) I have no idea what this has been done for?
- Also this mobo has 2 jumper bridges instead of 4. IIRC, that is something that affects which US Doubler chip should be used if installed.
- There is an EPROM instead of a ROM for the Tendon chip with an original ATARI label on it. Looks like Atari used EPROMS in some of the 1050s?