iav1917@ritcv.UUCP (12/11/86)
In article <1793@ncoast.UUCP> wb8foz@ncoast.UUCP (David Lesher) writes: >> Article <174200005@uiucuxc> From: karamich@uiucuxc.cso.uiuc.edu >| No version of DOS on the market (MS or PC) that i know of will allow >640K. >DEC Rainbows running MS-DOS have up to 896k of RAM. Go Rainbows!... :-) Here's an example... Using the Jay Jervey CHKMEM program: CHKMEM V1.0 (c) 1985 by Jay Jervey 917,504 = 896K bytes total system memory 262,144 = 256K bytes allocated to RAM disk 51,344 = 51K bytes occupied program space 604,016 = 589K bytes free program space from 307K to 896K AND, on top of the 896K, you have 8K RAM for screen memory, ~56K for ROMs and non-volatile RAM, and a ~64K gap with nothing in it (could have been filled if DEC or someone made a bigger RAM board)...all of this memory is addressable (except the gap, of course). And, to top it off, there is another 32K of indirectly-addressable RAM dedicated to the graphics board. It's off the main bus and this can be an advantage or a disadvantage depending on the application. I think the main reason for this was to allow CP/M-80 applications to access the graphics board which was above the 64K boundary. Just puttin' my two cents in... Alan ================================================= alan i. vymetalik uucp: {allegra,seismo}!rochester!ritcv!iav1917 ------------------------------------------------- Prism Software Designs, 646-1 University Avenue Rochester, New York, 14607-1232 (716)-461-2446 ------------------------------------------------- Greater Rochester Area Local Users Group (GRALUG) Vice-Chairman Rainbow Special Interest Forum =================================================