Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!hao!boulder!sunybcs!rutgers!mcnc!ecsvax!mjg From: mjg@ecsvax.UUCP (Michael Gingell) Newsgroups: comp.sys.ibm.pc Subject: Re: How to turn off cursor? Message-ID: <4215@ecsvax.UUCP> Date: Wed, 25-Nov-87 08:56:28 EST Article-I.D.: ecsvax.4215 Posted: Wed Nov 25 08:56:28 1987 Date-Received: Sun, 29-Nov-87 01:04:16 EST References: <2065@killer.UUCP> <5060014@hpccc.HP.COM> <3639@uw-june.UUCP> <3678@uw-june.UUCP> Organization: UNC Educational Computing Service Lines: 48 Summary: I agree, the 6300 seems to be an oddball In article <3678@uw-june.UUCP>, marty@uw-june.UUCP (Marty Sirkin) writes: > In article <429@cpsc6b.cpsc6a.att.com>, crs@cpsc6b.cpsc6a.att.com (Chris (I'm Outta Here!) Seaman) writes: > > > Sorry this didn't work for you, but I *DID* try it, and it works on my 6300. > > I am sorry for flaming you on the previous posting, and it may well work on > your 6300, but if you try it on any IBM PC/XT/AT/PS2 (or on Phoenix BIOS, or > other "standard" BIOS), or look it up in Norton (or one of several other > books) you will see that it *shouldn't* work. The fact that it does on your > 6300 is an exception, not the rule. > I agree, I wrote a routine to turn the cursor off which works on PCs, Ats PS/2s, clones, MDA, CGA, EGA, EGA clones but apparently NOT the 6300. Using the standard call to set the cursor size you simply define the line line within the character block at which the logic turns the cursor on and the line where it it is turned off. If you define it to be turned off at any line within the normal display box for one character then it gets turned off every time the cursor cell is scanned. If you also define it to be turned on at a line outside the range that is ever scanned (e.g. 8 or higher for MDA, 12 or higher for CGA, more for EGA) then the scan counters never reach a point where they detect coincidence and thus the cursor is never started. It seems to me this is primarily a function of hardware on the MDA and CGA but certain BIOSs may mask the numbers you try and send to the hardware. In the EGA, emulating the CGA, the hardware function is partially emulated by the EGA BIOS and it works just fine. Are ther any other 6300 experts out there that can shed light on why the cursor on/off routine doesn't work. For the record, here is my cursor routine: ; set cursor start in ch, end in cl ; to set cursor off mov cx,0f0eh mov ah,1 int 10h ; to set cursor on mov cx,0107h mov ah,1 int 10h Im sorry, I dont have the exact numbers in front of me now for the start/end for turning the cursor off. This is from memory. Thats it, ..... Mike Gingell ..ecsvax!mjg