----------------------- Manual for N_SYSCOM 1.1 ----------------------- It is now possible to see the Gemdos, Bios, Xbios and GEM (AES and VDI) actions your computer is doing on screen. N_SYSCOM.ACC can only be run as an accessory; settings can be changed (not saved however) by clicking on the "System Command" menu. You can choose between showing or not showing the system commands. Clicking on "Yes" leads to the question about the position you want the information showed. "Top" means at the top of the screen, "Menu" means just under the menu bar and "Bottom" means at the bottom of the screen. The momentary value will be the default button. Defaults at startup are "No" and "Bottom". Information will be displayed with the system 8x8 font; this information is written to the screen directly, which is the reason N_SYSCOM only works with the highest, monochrome resolu-tion. Writing to the screen is done with a VBL routine, which writes the information each time the screen has renewed 3 times, so about 72/3 times pro second. The VBL routine is installed in the first entry in the VBL queue with the XBRA id "NSC1". The vector allready installed there will be executed after this VBL routine is ready. N_SYSCOM installs its own Gemdos, Bios, Xbios and Gem vector. This is done with the same XBRA id "NSC1". The opcode send to one of those system vectors is translated in a 'normal' readable code and printed on screen. The opcode is then send to the original system vector, so no commands are lost ... Showing the information on the screen takes time. Some measures with Quick Index 1.6 show that your Atari is working at about 95% of the original velocity when N_SYSCOM is installed; there is practically no loss when no information is shown ... N_SYSCOM works with all TOS versions and in High resolution (640*400) only ... There are no bugs known about this program except the ones described above, which are no bugs actually. This program is strictly Public Domain, so it may not be sold in any way. N_SYSCOM.TXT should always be accompanied by N_SYSCOM.ACC and the other way around. Use it at your own risk (though, what can happen?). N_SYSCOM is written in assembler. The actual code is only 1000 bytes: the rest is data (all the 'readable' commands have to come from somewhere!). The source can be obtained for a small fee. Write to the author for further information. Noud van Kruysbergen N.I.C.I. P.O. Box 9104 6500 HE Nijmegen email:kruysbergen@hnykun53.bitnet