On Tue, 22 Jan 2002 firstname.lastname@example.org wrote: > 2) serial devices seem not to be there, only tape device #1 seems to be > there > 3) RS232 routines seem to also be missing That makes sense, as the UltiMax lacks the $dd00 CIA. On Tue, 22 Jan 2002 email@example.com wrote: > The VC-10 need at least 40*25 = ~1KB space for the screen, then 256 bytes > zeropage and 256 bytes stack. Means only 512 bytes are left. Not much IMHO? > So that's why the extra 2 KB are needed. To be more accurate, the space below $0800 is initialized in a similar fasthion as it is on the C64. The on-cartridge RAM should map to $0800-$0fff, as the UltiMax reports 2047 bytes free with this cartridge plugged in. > That VC-10 shows that only 2 KB are free could mean that is has dedicated > the "left over" 512 bytes for other things. You mentioned yourself the > datarecorder works fine so at least we need some space to buffer data. The 192-byte cassette buffer for OPEN/PRINT#/GET#/INPUT#/CLOSE operations is located at $033c on the C64. When LOADing and SAVEing programs, the cassette buffer is only used for the file name. > Then I have question myself: I assume that some (maybe most) of the games > are graphical. IMHO this would mean that all these card must have at least 8 > KB of RAM onboard. Is this true or am I missing something? Character graphics, I would say. Also the VIC-20 has only 5 kilobytes of "graphics memory". Note that the ROMH chip can hold 4k of (predefined) graphics that is mapped at $2000 or $3000 (I forgot which) in the VIC-II address space. Marko Message was sent through the cbm-hackers mailing list
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