DavidMil Posted December 14, 2016 Share Posted December 14, 2016 Any body have a working 835 modem (in the USA) that they are willing to sell/rent/loan me for a few weeks? I need to make a copy of the 1k ROM on the MPU so I can fix a couple of others I have. I don't mind sending a security deposit for the use of the modem too. Or if someone knows where I could find a working 835 please let me know! Thanks, David Milsop Kingwood, Texas Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted December 15, 2016 Share Posted December 15, 2016 failing that can someone make a copy for you, might be an option? Quote Link to comment Share on other sites More sharing options...
+David_P Posted December 15, 2016 Share Posted December 15, 2016 Perhaps Best or B&C have the ROM for sale? Quote Link to comment Share on other sites More sharing options...
DavidMil Posted December 16, 2016 Author Share Posted December 16, 2016 I've talked to Brad at Best and he said they are totally sold out. B&C doesn't have one listed, but I haven't talked to anyone there yet. I would be pleased and willing to pay someone for an image of the 1K of ROM that the 8048 had. The thing is, Atari used this chip in other devices as well. I know for sure that the 1027 had one. So the chip has to come out of an 835. DavidMil Quote Link to comment Share on other sites More sharing options...
+David_P Posted December 16, 2016 Share Posted December 16, 2016 What is the Atari part #? Quote Link to comment Share on other sites More sharing options...
BillC Posted December 16, 2016 Share Posted December 16, 2016 The Best Electronics website does list the MPU for the 835(under custom ICs), but you would need to confirm with Brad if it contains the proper firmware. CO60549 (835 MPU) $15.00 1 Quote Link to comment Share on other sites More sharing options...
tuf Posted December 17, 2016 Share Posted December 17, 2016 The Best Electronics website does list the MPU for the 835(under custom ICs), but you would need to confirm with Brad if it contains the proper firmware. CO60549 (835 MPU) $15.00 I have an 835 and Dropcheck's ROM burner - if that can handle it I'll dump it for you. Quote Link to comment Share on other sites More sharing options...
DavidMil Posted December 18, 2016 Author Share Posted December 18, 2016 That would be really cool! Thank you, David Milsop Kingwood, Texas Quote Link to comment Share on other sites More sharing options...
BillC Posted December 19, 2016 Share Posted December 19, 2016 According to the 835 schematic there is no separate ROM, there would only be the 1kB ROM integrated into the 8048 MPU. Quote Link to comment Share on other sites More sharing options...
DavidMil Posted December 19, 2016 Author Share Posted December 19, 2016 That is correct. The 1k Rom is on the P8048H chip. David Quote Link to comment Share on other sites More sharing options...
gamer-stu Posted January 6, 2017 Share Posted January 6, 2017 I have one that I could send you, if you're still looking. For free (minus power supply). I can't test it, but the light turns on when I flick the power switch. ? Quote Link to comment Share on other sites More sharing options...
DavidMil Posted January 10, 2017 Author Share Posted January 10, 2017 I got the 835 board and I'll test it out tonight. Is there something I can help you with? Thanks again, David Milsop Quote Link to comment Share on other sites More sharing options...
gamer-stu Posted January 10, 2017 Share Posted January 10, 2017 Glad you got it. Might be good to upload the rom to archive.org or some other repository. 1 Quote Link to comment Share on other sites More sharing options...
DavidMil Posted February 24, 2017 Author Share Posted February 24, 2017 I got a good P8048 MPU chip and I now have two working 835 modems and I fixed gamer-stu's modem too. I tested them with Atari's CPS Diagnostic Disk FD100577 (Rev 02). Thanks to all! David Milsop Kingwood, Texas 4 Quote Link to comment Share on other sites More sharing options...
ijor Posted February 24, 2017 Share Posted February 24, 2017 (edited) Please share the ROM dump so that it could be publicly preserved. Thanks. Edited February 24, 2017 by ijor 4 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 24, 2017 Share Posted February 24, 2017 I have a Universal Programmer that does 8048's if you're interested. Hopefully, it isn't copy protected. 2 Quote Link to comment Share on other sites More sharing options...
AtariGeezer Posted February 24, 2017 Share Posted February 24, 2017 I got a good P8048 MPU chip and I now have two working 835 modems and I fixed gamer-stu's modem too. I tested them with Atari's CPS Diagnostic Disk FD100577 (Rev 02). Thanks to all! David Milsop Kingwood, Texas Please post a dump of the ROM, I have two that need fixing too I have a Universal Programmer that does 8048's if you're interested. Hopefully, it isn't copy protected. Which Programmer is that? My Willem will do P8048AH, not sure if that is the same type of MCS? Quote Link to comment Share on other sites More sharing options...
Bryan Posted February 24, 2017 Share Posted February 24, 2017 Yeah, we need to dump all the Atari 8048 code. I'm pretty sure there's info online for dumping even the protected ones. 2 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 24, 2017 Share Posted February 24, 2017 Please post a dump of the ROM, I have two that need fixing too Which Programmer is that? My Willem will do P8048AH, not sure if that is the same type of MCS? I'll have to double check, but I believe my Sunrise Z-1000b will do them. 1 Quote Link to comment Share on other sites More sharing options...
DavidMil Posted February 25, 2017 Author Share Posted February 25, 2017 Please remember that the 8048 is not a ROM chip it is a MPU with 1K of ROM built into it. I would doubt very seriously that you could copy protect it. The ROM was dumped to a D8748 EPROM (which is a pin for pin compatible version of the 8048 MPU chip). David Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 25, 2017 Share Posted February 25, 2017 I know what an 8048 is, just wasn't sure if it supported protection. Protection goes back to at least PALs Quote Link to comment Share on other sites More sharing options...
ijor Posted February 25, 2017 Share Posted February 25, 2017 (edited) Seems there is no protection support on the 8048. But many MCU devices support firmware protection. Some based on masked ROM don't have any kind of external bus interface, other than I/O ports. So you simply have no external way to access the firmware. Other devices, usually using OTP (One Time Prom), have a firmware that could be written externally, but it couldn't be read back. I don't remember when the first devices with firmware protection by design were available. Edited February 25, 2017 by ijor Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted February 27, 2017 Share Posted February 27, 2017 Kyle should be able to read it and write it.... so it would be cool to let him do it... the resulting post should include not only the code but maybe a side note on what programmers/requirements that will write it for the future 1 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 27, 2017 Share Posted February 27, 2017 Well, I thought my Sunrise programmer did 8048's, but I got it out and fired it up, and no 8048's on the list. I'm going to look for one that does them. Quote Link to comment Share on other sites More sharing options...
AtariGeezer Posted February 27, 2017 Share Posted February 27, 2017 (edited) Yesterday I ordered a 8048 adapter for my Willem board from This Place for only $4 plus shipping I'll be able to read them, plus burn them I'll post the dump as soon as the adapter arrives... DavidMil will not be able to post the ROM dump of the 835 as someone who donated a 8048 for him to check out doesn't want to share it (the ROM Dump) Edited February 27, 2017 by AtariGeezer Quote Link to comment Share on other sites More sharing options...
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