There are two sets of DOS ROMs for the 8280 on zimmers.net, 30054x-001 and 30054x-revA. Comparing these two sets, there are a total of seven differences between them. Where they are different, the -001 ROMs are one higher than the -revA ROMs. This includes two locations where there are $AA fill bytes and the -001 ROMs have two $AB amongst all the $AA. It appears that the -001 ROMs are defective. On Tue, 7 Jul 2015, William Levak wrote: > > On zimmers.net there are two 8280 300541 files: 300541-001.bin and > 300541-revB.bin. If you compare the two files, everywhere they are > different, 300541-001.bin is 2 higher than 300541-revB.bin. If you > disassemble them, 300541-revB.bin makes sense; 300541-001.bin does not. > > Therefore: 300541-001.bin is a version of 300541-revB.bin with a bad d1 > line. > > The schematics do not show a GCR ROM. > > The schematics are available at: > > www.cbmhardware.de/floppy/cbm8280.php > > They are very fuzzy and hard to read. I am working on cleaning up a copy. > When it is ready, I will send it to zimmers.net. Don't expect much. It was > scanned at a very low resolution. > > wlevak@sdf.lonestar.org > SDF Public Access UNIX System - http://sdf.lonestar.org > > Message was sent through the cbm-hackers mailing list > wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2015-07-09 04:00:07
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