ralf+@cs.cmu.edu (Ralf Brown) (06/15/91)
[I posted the following on comp.sys.tandy on Monday, but haven't received any replies (there have only been eight posts since, anyway). Since this is about old calls, I figured I would try alt.folklore.computers in addition to comp.os.msdos.programmer.] I'm looking for information on some old BIOS calls which are presumably Tandy-specific, but would also be interested in any other calls people might know about (such as Deskmate). The following are calls which have been in the MSDOS interrupt list since at least July 1987, so they probably pertain to either the model 2000 or early model 1000's. INT 0A (IRQ 2) hard disk INT 0D (IRQ 5) 60 Hz RAM refresh INT 10/AH=70h get video RAM address INT 10/AH=71h get INCRAM address (what is INCRAM, anyway?) INT 10/AH=72h scroll right INT 10/AH=73h scroll left INT F8 10ms interval timer INT FA USART ready INT FB USART Rx ready (keyboard) I would like to know at least for which model(s) the above calls are valid, and what INCRAM is. I would also appreciate it if respondents could write up brief descriptions of the calling sequences which are not derived from the MSDOS interrupt list. Copyright has been claimed (retroactively) on the July 1987 version from which I started, meaning the above calls are now the only entries which are not in the public domain (I've already replaced the rest). -- {backbone}!cs.cmu.edu!ralf ARPA: RALF@CS.CMU.EDU FIDO: Ralf Brown 1:129/53 BITnet: RALF%CS.CMU.EDU@CARNEGIE AT&Tnet: (412)268-3053 (school) FAX: ask DISCLAIMER? Did | It isn't what we don't know that gives us trouble, it's I claim something?| what we know that ain't so. --Will Rogers