MrMartian Posted May 10, 2020 Author Share Posted May 10, 2020 21 minutes ago, Jeffrey Worley said: Here's another copy of the rom. This is the one I burnt yesterday and is the one I downloaded from this thread. Mr. Martian's filenames are not terribly imaginative, so I renamed this one for greater clarity, but it is his rom. rana8531 US Mod Rom.bin 4 kB · 1 download Yeah, I often go back and curse myself trying to remember which file was which... I'm too used to small filenames. But, this should be 8031 as that's the chip (or 8051), not 8531 .. ?? Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 10, 2020 Share Posted May 10, 2020 21 minutes ago, MrMartian said: Yeah, I often go back and curse myself trying to remember which file was which... I'm too used to small filenames. But, this should be 8031 as that's the chip (or 8051), not 8531 .. ?? OOPS. And I don't have permissions to edit. Doggone it. The filename was correct on my drive and I renamed it thinking it was incorrect. Shoulda gone with the first iteration. Jeez. Quote Link to comment Share on other sites More sharing options...
BillC Posted May 10, 2020 Share Posted May 10, 2020 (edited) 12 hours ago, Jeffrey Worley said: These things tell me that the RF being generated is longish-wave. FM. Single density uses FM, and dual/double density use MFM, encoding. Edited May 10, 2020 by BillC Quote Link to comment Share on other sites More sharing options...
+skr Posted May 10, 2020 Share Posted May 10, 2020 Just figured out, that my EPROMS are in my cellar. Don´t go there tonight (it´s 11pm here already). But just to make sure, which file is the right one for my drive? -> Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted May 10, 2020 Share Posted May 10, 2020 (edited) there are 2x drive types - using either intel or MOS CPU. one requires the crystal swap, the other does not. from the image, yours is the intel variant this is a brilliant mod, it improves speed but in my case - reliability too! kudos to Mr Martian for his work Edited May 10, 2020 by xrbrevin 1 Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 10, 2020 Share Posted May 10, 2020 19 minutes ago, skr said: Just figured out, that my EPROMS are in my cellar. Don´t go there tonight (it´s 11pm here already). But just to make sure, which file is the right one for my drive? -> Yes. For the rom version I just posted this is the right drive. Remember to check your crystal. You may already have a 12mhz version, in which case you don't need to do anything but swap the rom. If you have an 8mhz crystal, then you will have to substitute a 12mhz one. Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted May 10, 2020 Share Posted May 10, 2020 2 hours ago, Jeffrey Worley said: OOPS. And I don't have permissions to edit. Doggone it. The filename was correct on my drive and I renamed it thinking it was incorrect. Shoulda gone with the first iteration. Jeez. I've granted edit permission to your earlier post, and the post by "MrMartian" which precedes this one, so you should both be able to revise your earlier posts as needed. 2 1 Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 11, 2020 Share Posted May 11, 2020 1 Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 11, 2020 Share Posted May 11, 2020 Ah grasshopper, the virtue of patience was disturbed as a windy storm breaks the mirrored surface of the calm pond... I weep grasshopper... and offer you... 1 Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 11, 2020 Share Posted May 11, 2020 I tried a choke today and it didn't take, so I decided to take an ax ^H^H^H Dremel to it. Works good though. I'll fill in with Bondo (r) and paint and it'll be like new..., but stable, and fast. Jeff Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 11, 2020 Share Posted May 11, 2020 11 minutes ago, _The Doctor__ said: Ah grasshopper, the virtue of patience was disturbed as a windy storm breaks the mirrored surface of the calm pond... I weep grasshopper... and offer you... BTW, in the process of doing today I realize that you may well be onto something with regard to a field generated by the spindle motor. I cut the "TEE" part on the left to open the motor after the center slot did not perfectly resolve the problem. The right arm of the "TEE" is cut merely for symmetry. 1 Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 11, 2020 Share Posted May 11, 2020 I still have seven 12mhz crystals to give away. Please don't be shy about asking for them. I bought a book of stamps too, so I'm armed for bear now. Best, Jeff 1 1 Quote Link to comment Share on other sites More sharing options...
toddtmw Posted May 11, 2020 Share Posted May 11, 2020 So, I had a Rana 1000 and an Indus GT BITD. I got the Rana first, but other than just sounding feeble compared to the Atari 810 a friend had, it seemed to work fine. Was this issue something that I might not have noticed? Or if it would have been noticed and I didn't have it, any idea why? (Unfortunately, the original Rana I had was lost long ago. the one I have now, I have not used much. I was thinking of going down to look for the issue, but not sure what to look for. Thanks. Quote Link to comment Share on other sites More sharing options...
MrMartian Posted May 11, 2020 Author Share Posted May 11, 2020 3 minutes ago, toddtmw said: So, I had a Rana 1000 and an Indus GT BITD. I got the Rana first, but other than just sounding feeble compared to the Atari 810 a friend had, it seemed to work fine. Was this issue something that I might not have noticed? Or if it would have been noticed and I didn't have it, any idea why? (Unfortunately, the original Rana I had was lost long ago. the one I have now, I have not used much. I was thinking of going down to look for the issue, but not sure what to look for. Thanks. All I can say is I have two here, one 6502 and one 8031, and neither have this issue. I had never heard of it until recently, but it does seem to affect some people.. <shrug> electronics.... Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 11, 2020 Share Posted May 11, 2020 4 minutes ago, toddtmw said: So, I had a Rana 1000 and an Indus GT BITD. I got the Rana first, but other than just sounding feeble compared to the Atari 810 a friend had, it seemed to work fine. Was this issue something that I might not have noticed? Or if it would have been noticed and I didn't have it, any idea why? (Unfortunately, the original Rana I had was lost long ago. the one I have now, I have not used much. I was thinking of going down to look for the issue, but not sure what to look for. Thanks. They are known for being slow and unreliable. I think I discovered why recently. The characteristic problem is retries on reads make the drive seem slow (because the drive has to do the same thing twice), and sound stuttery. That and they would sometimes fail on retry, which meant your disk was now corrupt. The trick seems to be to resolve radio frequency interference inside the drive. Mine works like gangbusters now that Fred Sanford got hold of it with a dremel tool. THAT is not the elegant solution, but it points to the problem and someone smarter than I will come up with the elegant fix. Best, Jeff Quote Link to comment Share on other sites More sharing options...
toddtmw Posted May 13, 2020 Share Posted May 13, 2020 Hi. I took mine sort. Not sure which drive I have. how can I tell? here is a picture. also, where is the crystal? thanks! Quote Link to comment Share on other sites More sharing options...
toddtmw Posted May 13, 2020 Share Posted May 13, 2020 Also, any idea why the one chip has a sticker? Think it might have been upgraded already? Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted May 13, 2020 Share Posted May 13, 2020 (edited) the 40-pin chip at top-left is the intel 8031 type the crystal is at top-right - the silver component with 2x wires coming out of it's left edge the chip with the sticker is the EPROM Edited May 13, 2020 by xrbrevin Quote Link to comment Share on other sites More sharing options...
Mathy Posted May 13, 2020 Share Posted May 13, 2020 (edited) Hello guys 2 hours ago, xrbrevin said: the crystal is at top-right - the silver component with 2x wires coming out of it's left edge And "FOX" printed on it. Sincerely Mathy Edited May 13, 2020 by Mathy Quote Link to comment Share on other sites More sharing options...
MrMartian Posted May 13, 2020 Author Share Posted May 13, 2020 3 hours ago, toddtmw said: Also, any idea why the one chip has a sticker? Think it might have been upgraded already? If you could pull a copy of that ROM and compare it to any original image? Maybe you have another version? 1 Quote Link to comment Share on other sites More sharing options...
+skr Posted May 13, 2020 Share Posted May 13, 2020 Today the 12MHz has arrived, but I´m still searching searching for my EPROMs. I have three burners here, but can´t find the box with my EPROMs. Did some cleaning up here in the last weeks, and now I can´t find anything. Lesson learned: I´ll arrange with living in chaos where I find all I search and never clean up again. 2 Quote Link to comment Share on other sites More sharing options...
toddtmw Posted May 13, 2020 Share Posted May 13, 2020 3 hours ago, xrbrevin said: the 40-pin chip at top-left is the intel 8031 type the crystal is at top-right - the silver component with 2x wires coming out of it's left edge the chip with the sticker is the EPROM Can someone confirm what eprom I need for this? And which ROM image I need? Thank you! Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 13, 2020 Share Posted May 13, 2020 (edited) swap the crystal, this is the rom, burn it and replace yours with this... bob' your uncle faster more reliable RANA, if you still experience issues, you can employ toroid bead and encase spindle motor in shielding, make sure all ground paths are good and double check filter caps... as an added measure you can cut out case metal and fill it in with non ferrous material as seen in the thread. Edited May 13, 2020 by _The Doctor__ Quote Link to comment Share on other sites More sharing options...
toddtmw Posted May 13, 2020 Share Posted May 13, 2020 I "think" I dumped the rom from mine. (This is the first time I've tried it.) Did this work? Is this different than what we already had? Thanks! R1000C-AA1.BIN Quote Link to comment Share on other sites More sharing options...
Jeffrey Worley Posted May 13, 2020 Share Posted May 13, 2020 1 hour ago, toddtmw said: I "think" I dumped the rom from mine. (This is the first time I've tried it.) Did this work? Is this different than what we already had? Thanks! R1000C-AA1.BIN 4 kB · 1 download From the last line in the rom, I see that it is the same version as the one I just replaced the other day. Best, Jeff Quote Link to comment Share on other sites More sharing options...
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