@DATABASE AmigaMail @NODE MAIN "XII-17: Memory Limits for Various CDTV Configurations" @TOC "Table_of_Contents/XII" by Adam Levin-Delson RAM space is at a premium in the CDTV, so for the developer who is creating CDTV titles, it is important to know what the limits of system memory are. This is especially true for developers who want their titles to work on a variety of CDTV/A500 configurations. To help assist developers in making titles work on the maximum number of configurations, the following chart shows a variety of hardware configurations capable of playing CDTV discs. For comparison purposes, all machines were allowed to boot far enough to open the Workbench screen (in the default size) and a CLI/Shell window. This represents a reasonable starting point for developers to estimate if their application will fit into a CDTV's memory (To properly ascertain the amount of free memory in a particular CDTV/A500(+) at run time, use the Exec library's AvailMem() function). These results are not guaranteed for any particular configuration, they can and will change depending upon many variables, including additional hardware, overscan or interlaced screens, etc. Use this information only as a guideline. Do not assume that these result will remain constant in future releases of the OS. WARNING: -------- A title that consumes too much memory on a current configuration may not work in the future if a new release of the OS consumes even a little more memory. Important note about Workbench V1.3 and V 2.0. Under 1.3, the Workbench screen and initial CLI always open upon booting with an AmigaDOS disc. Under 2.0, the system only opens the Workbench screen when necessary, and only opens an initial CLI if the Startup-sequence attempts to output text. The C:Avail program first calculates the amount of free RAM and then prints out the results. Under 2.0, this means the amount of memory printed by Avail would differ from the amount of memory actually free by the amount needed to create the Workbench screen and initial CLI. NTSC/ 1.3/ Machine PAL 2.0 Peripherals * Avail In-Use Maximum Largest ------- ---- --- ----------- - ----- ------ ------- ------- CDTV NTSC 1.3 internal HD c 799448 240704 1040152 797312 floppy CDTV NTSC 1.3 floppy c 886688 153464 1040152 710472 CDTV NTSC 2.0 floppy c 840616 206936 1047552 689200 CDTV NTSC 1.3 SCSI card c 881248 158904 1040152 704904 CDTV NTSC 1.3 floppy c 878824 161328 1040152 878624 CDTV PAL 2.0 floppy c 807528 239992 1047520 792880 CDTV PAL 2.0 none c 828784 218768 1047552 824736 CDTV PAL 1.3 floppy c 877936 162216 1040152 710552 CDTV PAL 1.3 internal HD c 790488 249664 1040152 788352 floppy A500/570 NTSC 1.3 internal FD c 466256 56976 523232 466208 f 412728 104160 516888 412552 t 878984 161136 1040120 466208 A500/570 PAL 1.3 internal FD c 457296 65936 523232 457248 f 412704 104184 516888 412064 t 870000 170120 1040120 457248 A500+/570 PAL 2.0 internal FD c 809744 237776 1047520 795144 A500+ PAL 2.0 internal FD c 839688 207864 1047552 838648 CDTV NTSC 1.3 floppy c 886688 153464 1040152 710472 CDTV NTSC 2.0 floppy c 840616 206936 1047552 689200 CDTV NTSC 1.3 SCSI card c 881248 158904 1040152 704904 CDTV NTSC 1.3 floppy c 878824 161328 1040152 878624 CDTV PAL 2.0 floppy c 807528 239992 1047520 792880 CDTV PAL 2.0 none c 828784 218768 1047552 824736 CDTV PAL 1.3 floppy c 877936 162216 1040152 710552 A500/570 NTSC 1.3 internal c 466256 56976 523232 466208 floppy f 412728 104160 516888 412552 t 878984 161136 1040120 466208 A500/570 PAL 1.3 internal c 457296 65936 523232 457248 floppy f 412704 104184 516888 412064 t 870000 170120 1040120 457248 A500+/570 PAL 2.0 internal c 809744 237776 1047520 795144 floppy A500+ PAL 2.0 internal c 839688 207864 1047552 838648 floppy * c=chip; f=fast; t=total FD = Floppy Drive; HD = Hard Drive @ENDNODE