Hello Spiro, Sunday, April 7, 2013, 4:24:05 AM, you wrote: > Hello, > * On Sat, Apr 06, 2013 at 10:09:16AM +1100 Julian Perry wrote: > >> That's still in the 1541 ROMS, as late as 901229-03 which executed this code if ATN (I >> think) was low when the drive booted - my first 1541 (long gone)(short >> board) actually had it. >> >> Somewhere between -03 and -05 this autoexec code was removed, but the > Does anyone know if there actually exists a -04 ROM? I newer saw one > mentioned (other than me asking this question over and over again on > different forums...) No - I have never seen a 901229-04 ROM . I came to the conclusion that it must have been an internal revision, never released. >> "&" DOS command remains. I suspect the autoexec code was used as a >> development tool, facilitating a direct bootstrap from disk. > I am not sure if this was a development tool, or if CBM had something > actually planned with this. If it would not been present in the 2031 and > 1540, I would have expected it to be related to CP/M. But as the facts > are currently, this is not very likely. >> Presumably it was removed because it often caused the drive to load >> the error channel with error 50 (Record not found) on power up - and the drive >> error LED would flash. > Did you actually notice this behaviour ever? My drive has a -05 ROM, but > I tested with a -03 ROM in order to find out why it might have been > removed, and I never encountered any problems whatsoever. Yes. I do recall seeing it frequently. If you asked me for the sequence to reproduce it, I honestly couldn't tell you. (it WAS 28 years ago!) The only thing I DO remember was that it started happening when I bought a printer (Star Micronics Gemini 10X) and serial adapter. Presumably the loading of the IEC buss by that device fooled the drive into running the code. I don't have that drive anymore - I literally wore it out, and it couldn't hold an alignment anymore. Stripped it for parts. (the transformer ended up as a modem power supply for our BBS!!!!)` Julian Message was sent through the cbm-hackers mailing listReceived on 2013-04-07 00:00:03
Archive generated by hypermail 2.2.0.