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Post AwYZXU1bpiPqkdS9R2 by [email protected] |
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More posts by [email protected] |
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Post #AwTDws9W5xWW2U3NCq by [email protected] |
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Soo… I have gotten another CBM dual drive floppy disk. A model 4040, which us… |
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Post #AwTNCgj3FMaIouI5mS by [email protected] |
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The insides seem very familiar. The digital mainboard is as usual mounted upsid… |
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Post #AwTNCgq8p0FvAtbkpc by [email protected] |
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The analog board looks…. not that great. Not terrible, but there is an ugly h… |
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Post #AwTNCgwsPxdxVml8KW by [email protected] |
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The drive heads and mechanisms are also pretty grimy. There will be lots of cle… |
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Post #AwTNCh3G2EkPpZkEHA by [email protected] |
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The most precious piece of this machine is the MOS 6504, which is a 6502 with a… |
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Post #AwTNCh9deVqs9MjKDo by [email protected] |
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@root42 Ahh interesting, the Lisa IO board uses a 6504 for disk IO. |
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Post #AwTNChFfI6fkS3Y8cC by [email protected] |
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@paulrickards wow! I didn’t know! For Commodore it was an odd choice, as they… |
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Post #AwTNChM2uNmClqXEYq by [email protected] |
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@root42 @paulrickards if the 6504 hass less pins, maybe the package itself and … |
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Post #AwTNCi06VRoqm5HE00 by [email protected] |
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The ROMs should be DOS2.0, I think. I should check that eventually. They are wo… |
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Post #AwTNCiN97mFbvY3cum by [email protected] |
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The most worrisome is the analog board. It is looking quite rough. The copyrigh… |
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Post #AwTNCijplQOn3ufkHI by [email protected] |
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There are obvious signs of modding as well. There is a second LED and an extra … |
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Post #AwTQ84KQMf3sRBGDjM by [email protected] |
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@davbucci @root42 @paulrickards perhaps C= were just "we have to use all t… |
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Post #AwTa7R1NVU1q4OgjwG by [email protected] |
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@tinmouth @davbucci @root42 Both plausible I’d say. Likely a combination of … |
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Post #AwTa7rpbpLepDiODqK by [email protected] |
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@root42 cool, never seen one of these before 😃Can you access it by using ,8,… |
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Post #AwTa7rwLQJ2rYbXbLE by [email protected] |
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@moonshinebrigade no that’s not how these drives work. PETs don’t take the… |
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Post #AwUQ5vRic1CHT5buM4 by [email protected] |
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@root42 Oh, no kidding she's a beauty. |
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Post #AwUUuEqh99a5wOXVXE by [email protected] |
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@tinmouth @root42 @paulrickards “uuhhh, we have built 20000 chips that do not… |
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Post #AwV4ZwKNtXbb3a2x28 by [email protected] |
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0 likes, 1 repeats |
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Back with the 4040: as usual the drive is a dual CPU system. The second CPU is … |
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Post #AwV51k07JrlQvxp6nI by [email protected] |
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Taking the drive apart niw for cleaning. Keep some photos on which connectors g… |
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Post #AwV58ED7uf22Mj0Asq by [email protected] |
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The screws in this drive are partially stripped. Whoever worked on this machine… |
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Post #AwV5isuc3znd1Woz68 by [email protected] |
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@root42 I have hundreds of those connectors (I mean, those that are soldered in… |
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Post #AwV6VM6CqlajRgMAro by [email protected] |
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@davbucci thanks! But this part works, so not keen of replacing it. :) |
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Post #AwV6haAKNRHKXy7AWm by [email protected] |
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Getting the drive mech out is relatively easy. But instead of four screws on th… |
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Post #AwV6iZ0WAWg1FCzhCq by [email protected] |
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@root42 “If it works, don’t fix it” is the best approach! |
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Post #AwV6mRGmsYIKPAS4sy by [email protected] |
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@root42 ooof, this one could use some scrubbing! |
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Post #AwV7D2optWKyOI43Oa by [email protected] |
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The mechanisms are original Shugart 390. I guess they used to be very common. P… |
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Post #AwV7dCIfGaMpKDUGRM by [email protected] |
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The ribbon cable cleans up very nicely. It has lots of nicotine dust on it. Pro… |
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Post #AwV8vJeikyJZIz0Vua by [email protected] |
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@root42 I don't know about older computers, but in pins it's usually th… |
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Post #AwV9lqLWSZD5kc4ffk by [email protected] |
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@apzpins agreed. If the connector is the issue I would try to replace it. Howev… |
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Post #AwV9ytMCZnRmqzc8Y4 by [email protected] |
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The cleaning of the case, drive mechanisms and the cables took a lot of cotton … |
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Post #AwVAGHhlIzDpI1zZom by [email protected] |
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An interesting tidbit: the Shugart drives use a microswith with a plastic bit t… |
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Post #AwVATqUjGjVKx9MXlQ by [email protected] |
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However drive 1, the one which had the LED mod, has a cutout where the lever wo… |
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Post #AwVD76wiEkChB6IofQ by [email protected] |
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The drive responds with an Error 21, which means no sync pulse. This is not gre… |
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Post #AwVDJwjRWWYhGSDSUq by [email protected] |
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The other head looks fine, EXCEPT for one pair which is a bit high at 81.3 Ohms… |
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Post #AwVFF9gU8inNtafxVw by [email protected] |
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@root42 Do you pre-emptively replace them or just replace them systematically?W… |
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Post #AwYZXU1bpiPqkdS9R2 by [email protected] |
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@root42 do you suspect a modified firmware in the ROM? |
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Post #AwYcD4sju8nCqHGXWi by [email protected] |
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@kurth no. The ROMs are masked ROMs and all original. |
