22 September 2018, 23:03 | #1 |
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A1200 stock free memory for DOS boot
Hi all,
I'm at a cross roads as to make a decision on using a track loader or loading files with the dos library via floppy disk. On a stock A1200 system with 2Mb chip ram, does anyone know roughly how much actual ram I would have available if I was to boot my project using a floppy with a startup-sequence etc? or... Point me to a utility that would give me the info? Any help is greatly appreciated. Cheers, Geezer |
22 September 2018, 23:14 | #2 |
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Bare A1200, KS3.0, DF0 solo:
00000400 10 -10 chip memory Attributes 0703 First 0000d0f8 Lower 00000420 Upper 00200000 Free 1939064 Largest: 00025308-001fe800,00000000,001d94f8 (1938680) With DF1: Attributes 0703 First 000147b0 Lower 00000420 Upper 00200000 Free 1912520 Largest: 0002bab8-001fe800,00000000,001d2d48 (1912136) For +DF2/+DF3 subctract the same difference. But you can gain various KB with my AddChip bootblock (that disable DF1-DF3 and make one plane screen). |
22 September 2018, 23:18 | #3 | |
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Quote:
Geezer |
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22 September 2018, 23:41 | #4 |
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Note it varies a bit depending on kickstart version. I tried this as well with a DF0: only environment and got 1920000-1930000 and 1950000-1960000 depending on when I called avail (before or after the CLI loaded).
Much nicer than an A500 anyway |
22 September 2018, 23:50 | #5 | |
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Quote:
It's a rough estimate, but a good one. |
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23 September 2018, 00:06 | #6 |
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I’ll be good if i have over 1700kb free.
I dont fancy writing a track loader to be honest, would comllicate things. |
23 September 2018, 02:45 | #7 |
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mcgeezer: Will you be reading data at the end of the level or during the level??
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23 September 2018, 10:05 | #8 | |
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Quote:
I'll allocate memory and then load all the compressed assets before the system shuts down, everything will then run from ram. Most assets will be decompressed into their correct locations at run time, others such as the backgrounds will be decompressed at each sanctuary scene, these only add up to around 120Kb compressed so it's worth keeping them in ram as opposed to loading them from disk, it will probably make it easier for a WHDload too. Geezer |
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24 September 2018, 07:30 | #9 |
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well done. Keep up the good work
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