KLund1 Posted September 8, 2018 Share Posted September 8, 2018 I need to replace a WD2793PL-02 in two 1050's. What other IC's are compatible? Would a WD2793A-PL work? Are there other compatible variants? I also need the Tandon eprom image file. Anyone have it handy? Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted September 8, 2018 Share Posted September 8, 2018 you can also use a WD2797 but you have to bend up pin 25 - that is allocated to 'double sided' function that the 1050 does not use Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted September 8, 2018 Share Posted September 8, 2018 see attached 1050 stock eprom.BIN Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 8, 2018 Share Posted September 8, 2018 see attached That ROM is Rev L, which indeed supports both the 2793, as well as the 2797 (with pin 25 disconnected). Rev J & K only support the 2793 controller. The made in Hong-Kong WST mechs have their own firmware which is based on Rev K with modified stepper code, and does not support the 2797 controller. The other known stock revs can be found in this post: http://atariage.com/forums/topic/156462-1050-roms/?p=3580891 1 Quote Link to comment Share on other sites More sharing options...
1050 Posted September 8, 2018 Share Posted September 8, 2018 Yes, WD2793A-PL should work nicely. Not another FDC the can substitute for the 2793 directly pin for pin, and I'm not aware of any clock issues where variants can cause issues like the 68B21 chip which is rated for 2 MHz use and the 6821 is the 1 MHz version. If it says 2793 you should be gold. Quote Link to comment Share on other sites More sharing options...
KLund1 Posted September 8, 2018 Author Share Posted September 8, 2018 Great!! You all are very helpful once again!! Parts ordered. eprom cooking under the UV I should have2 more 1050's back to circulation very soon. 1 Quote Link to comment Share on other sites More sharing options...
BillC Posted September 8, 2018 Share Posted September 8, 2018 Great!! You all are very helpful once again!! Parts ordered. eprom cooking under the UV I should have2 more 1050's back to circulation very soon. You should also read the following thread about calibrating the drive to the replacement FDC. http://atariage.com/forums/topic/282626-howto-adjust-analogue-part-of-fdc-279x-in-a-1050-disk-drive/ Quote Link to comment Share on other sites More sharing options...
KLund1 Posted September 8, 2018 Author Share Posted September 8, 2018 Thanks BillC I do not have a scope, and they are still a bit out of my hobby budget. Not that I'd know how to use it if I got it. Not an EE person am I. I do test formatting in SD & more importantly ED, and boot those in other drives. Also run real games disks with copy protection for more real world testing. Also have test programs on my Ultimate Cart to use too. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 9, 2018 Share Posted September 9, 2018 Would a WD2793A-PL work? I looked in the Tandon 1050 I currently have open next to me, and it has a WD2793A-PL from the factory actually. 1 Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted September 9, 2018 Share Posted September 9, 2018 you can get a cheap self-assembly kit as an entry-level oscilloscope search ebay for DSO138 kit: https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=dso138+kit&_sop=15 1 Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 9, 2018 Share Posted September 9, 2018 you can get a cheap self-assembly kit as an entry-level oscilloscope search ebay for DSO138 kit: https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=dso138+kit&_sop=15 Ohhh very cool. Thanks for the tip! Quote Link to comment Share on other sites More sharing options...
KLund1 Posted September 15, 2018 Author Share Posted September 15, 2018 Way cool on the DSO138. There is a newer version DSO138mini that says it has more features. I'm looking for a fully built unit. AAAAAHHHHHH just load up my eprom burning software and it dose not support 24 pin dips. only 32 pin !!!! Looked again and it only supports amd2732B 24 pin dips. Anyone willing to trade a blank Hitachi HM462732G for a programed eprom with the BIN above?? Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 15, 2018 Share Posted September 15, 2018 Way cool on the DSO138. There is a newer version DSO138mini that says it has more features. I'm looking for a fully built unit. AAAAAHHHHHH just load up my eprom burning software and it dose not support 24 pin dips. only 32 pin !!!! Looked again and it only supports amd2732B 24 pin dips. Anyone willing to trade a blank Hitachi HM462732G for a programed eprom with the BIN above?? After scrolling through hundreds of DSO130's on ebay this past week, I finally settled on this one that has an option to include the fully assembled unit, WITH acrylic case, WITH power supply without having to add them all separately: https://www.ebay.com/itm/113144118660/. I also figured out the power supply needed is 9VDC, of which I don't have any of handy so wanted to include that. As for your eproms -- Compare the datasheet for the amd2732B vs HM462732G - if the programming voltages are the same, and timings are close enough, (or you can manually override some settings in the software) you may still be able to interchange them in your programmer. Quote Link to comment Share on other sites More sharing options...
KLund1 Posted September 18, 2018 Author Share Posted September 18, 2018 I just ordered a couple amd's. We'll see if they are still good. Is the DSO138 sensitive enough for working on all the 8-bit, and 16-bit mainstream micro computers out there? Quote Link to comment Share on other sites More sharing options...
HiassofT Posted September 19, 2018 Share Posted September 19, 2018 Is the DSO138 sensitive enough for working on all the 8-bit, and 16-bit mainstream micro computers out there?No, this thing is a toy. Better stay away from it and save your money. With 200kHz bandwidth and 1 megsamples/second you can do some measurements in the audio frequency range (and a bit above) but it's useless for checking stuff on the Atari. so long, Hias Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 19, 2018 Share Posted September 19, 2018 With 200kHz bandwidth and 1 megsamples/second you can do some measurements in the audio frequency range (and a bit above) but it's useless for checking stuff on the Atari. D'oh, was hoping it would be somewhat useful for checking the write compensation setting of a 1050... Quote Link to comment Share on other sites More sharing options...
E474 Posted September 19, 2018 Share Posted September 19, 2018 There's an article starting on page 40 of "Atari Magazin", March 1987, on programming a Happy that lists a value of 230ms. It's also quite an interesting article. I think I found it on the Atari Mania site, as a PDF. 1 Quote Link to comment Share on other sites More sharing options...
KLund1 Posted September 19, 2018 Author Share Posted September 19, 2018 So what would be a good inexpensive scope to use for our Micro computer collection troubleshooting? I do not want to spends many hundreds on one that has way too features that a novice user would not use in trouble shooting. Quote Link to comment Share on other sites More sharing options...
HiassofT Posted September 19, 2018 Share Posted September 19, 2018 So what would be a good inexpensive scope to use for our Micro computer collection troubleshooting? I do not want to spends many hundreds on one that has way too features that a novice user would not use in trouble shooting. Standard scope for hobbyists ATM still is the Rigol DS1054Z - 4 channels are really helpful and you get a lot of nice features for the ~400 bucks it costs. so long, Hias Quote Link to comment Share on other sites More sharing options...
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