On Sat, 12 Apr 2014, Hoffmann-Vetter, Martin wrote: I have gone through the ROM images and have a number of questions/comments: 2040: You have the 901466-01 image. There is also a 901466-02. Is it the same? 251474-01b: This is the same as the DOS 2.7 Tandon. The 74LS06 hex inverter is probably there to provide the logic necessary to make a 4K EPROM appear as a 1K EPROM to the 6530. There isn't space in the 6530's address space for a 4K ROM. 2.7b DOS and fdc are a version of Speeddos. The fdc has only 55 differences with the Speeddos fdc. The DOS has only 251 differences out of 16K, 99 differences if you don't count different fill byte. The message area of the ROM contains the message "DOS SOFTWARE" that isn't in Commodore DOS. There are also two additional commands in the command list, "O" and "?". wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2014-04-21 15:01:05
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