Patent Owner Finjan, Inc. - EX. 2042, p. 1
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`Patent Owner Finjan, Inc. - Ex. 2042, p. 1
`
`

`
`PUBLISHED II‘?
`llllcrunalfil Freii
`
`A Division of Microsoft Cotpltrfliun
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`Copgrriglu ca 19845 by any Dunn
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`be reproduced or tflmmlflefl In any loan or by 1113' main: without
`the written penniiainn of the puhlimer.
`
`E‘;-FJ
`
`__ I..1'IJr:lr}r ocl Cmngrcss Cntlbging in Publication Dlti
`I Duncan. 11!!
`fldiranued MS-DDS
`Includes index.
`
`1. IIIS-[)D5[CoIupI|Ierupefli1':1g system}
`2. Afiombht tango-ye
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`flA?6.?&.l'.|ISJDiB53
`1936
`(fl5.Il-"II-I5
`56-3-I9-Ii
`ISBN ll-914345-1'7-2
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`Patent Owner Finjan, Inc. - Ex. 2042, p. 2
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`

`
`é
`
`Int 21H (33)
`General
`
`Int 21H (33)
`Function sumi
`
`Most of the MS-[R33 operating-s_vstern sen'iC¢.‘fi are invoked through software interrupt ZIH.
`Using these services. a program can inspect disk directories. iiiake or delete files. read or
`records within files. set or read the real-time clock. iind perform tnsuiy other fiinetions in 3
`harelware-iiidepeiidetit manner.
`The MS-DOS tiiiictioiis available through Int 2|}-I are well staiidardized ill1l.l available on my
`M5-DOS svsti.-iii.
`|’rogr.nns that perform all U0 through these functions will run on .in_v -
`chine that supports M5-l)L)S.
`
`Calling
`sequence:
`
`MS-I105 services can be invoked in several dill}.-rent ways:
`7 Load the AH register with the function number and other registers
`call-specific parameters. then execute an [in 21H. This is the rect
`method and produces the cleanest. most cottipaet object code.
`
`mov
`
`ah, funct ionmfluflber
`
`uo i
`
`nt
`
`2"|h
`
`Load the AH register with the ftuiction number and other i '
`- El
`with the c.ill——specific paranieters. then execute a long call to tiffset
`the program segment prefix. This liiiltage is wailahle only with
`version 2.0 and above.
`
`-
`
`Load the (IL register with the functiori number aiiel other registmi.
`call-specific parameters. then execute an iritrasegnieut mill to of? -~
`in the PS1’. which contains :1 long call to the MS-130$ function d --
`This method is valid only for function calls {NIH through 2-ll I.
`- .
`is -.i|ways destroyer! itithis method is used: otherwise. the re.-stilts
`as for the first two methods discussed above. The precursor to
`Hi‘:-DDS originally sold by Seattle (Ioniputer Products (tee Ch: -
`cluded this linkage mechanism to liicilitzte easy conversion ol'(
`grams. and its use should now be avoided.
`
`.
`-
`
`-
`
`The contents oft.-ll registers are preserved across MS-I105 calls. except for those re --
`used to return restilts. The only exceptions are function tufll-I. which was added in M '
`sion 2.25 to support extended character sets. and function -mt! (EZXEIJ).
`
`-
`
`For those fuiictions that art‘ ctsitiparable to Cl’/M l'uiietion.~‘» {UH}-I tlirough 24H). succ
`codes are typically returned in register AL. For those Iiinetioiis that were added in
`:-
`sion 2.!) and )llf1t.‘I\«'L'. the t'..irry flag is cleared to indie.ite .-iiict'es:-i or set to indicate lliilurc
`latter case J more spt'r.'ilic error code is also returned in register AK.
`
`-guy R. mp, W
`A -. 15;; 1;‘; ,,..
`U -‘ driw mttiiu
`F = lih: I:t'l'll'd H
`II = lunlk
`
`rldluiirrd MS—D().'i
`
`Patent Owner Finjan, Inc. - Ex. 2042, p. 3