167 lines
8.7 KiB
Groff
167 lines
8.7 KiB
Groff
Intercept v1.3 documentation
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by
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The Voice Over
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Okay...This is the latest version of Intercept. I wrote it because I
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learned that Intercept 1.2 wouldn't work properly with the Apple //c, and also,
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one of the instructions in the driver routine wasn't truly slot-independent, as
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I had hoped. Anyhow, it's done, so have fun...
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Section 1: How it works:
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-----------------------
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1.0: The process of booting:
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---------------------------
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When a disk that has been modified with Intercept is booted, the following
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is what takes place:
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1) The disk controller ROM reads Intercept's BOOT1 routine from track 0,
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sector 0 into page 8 of RAM.
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2) Intercept clears the screen to either spaces or inverted @'s and prints
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'Intercept 1.3' in the upper left corner, and the user defined message
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in the center of the screen.
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3) Intercept reads in the track/sector list from the sector stored at
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track in $8FE, sector in $8FF.
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4) Intercept reads in the Intercept driver, the old BOOT1 routine, and
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the code to be run as an interception from the sectors listed in the
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track sector list.
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5) Intercept jumps to the driver routine at $A00.
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6) The driver routine calls the intercepted code, and when the intercepted
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code returns to the driver, it moves the old BOOT1 routine to page
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8 from page B, sets up memory as if a disk had just been booted, and
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jumps into the controller ROM's routine that sets up the registers and
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jumps to $801.
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7) The boot continues as if nothing had ever happened.
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1.1: Intercept's structure:
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--------------------------
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Note: In the docs for Intercept 1.2, I kindly included a breakdown of the
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technical workings of Intercept, T/S list format, etc. Unfortunately, certain
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people (The Sector Smasher, Mad Rat, The Nudge, 6-Golds, and Knight Writer of
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The Star League) decided to be ASSHOLES and remove the small bit of credit I
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try to reap by putting Intercept 1.2 in the corner of the screen by changing
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the message to all spaces on their crack of Planetary Construction Set. These
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guys are so lame, they couldn't even figure out how to NOP out the print
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routine...they went and changed all of the data that made up 'Intercept 1.2'
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into data that would produce spaces. Well, guys, the whole reason I put in the
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user-defined message was so that people wouldn't take out the title and replace
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it with something of their own. Thanks to these morons who were not only too
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damn stupid to write their OWN boot routine, but also stupid enough to get
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caught stealing someone else's, there is no longer any technical information
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concerning Intercept available. I'd suggest you call them up and thank them if
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you wanted the data. The boards that they frequent are on the title page for
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Planetary Construction Set. Now I know how you felt about Bun E. Boot, Tyrone.
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Section 2: How to use Intercept:
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-------------------------------
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1) Crack a ware
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2) Make a title page program for it.
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3) Boot the Intercept 1.3 disk.
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4) SCANNING FOR BLANK SECTORS: Place the disk you plan to intercept in drive
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one or two and press the appropriate key. Intercept will begin to scan your
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disk for blank sectors that contain all $00s. If you already know where
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enough free sectors are to hold your title page program, plus 3 sectors for
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overhead, press the <ESC> key. Once you think Intercept has located enough
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free sectors to hold your title page, hit <ESC>. Note: You can let
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Intercept scan the whole disk for free sectors, as it will continue merrily
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along until it locates 255 blank sectors, but why spend the extra time?
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5) DEFINING THE BOOT PARAMETERS: There are four parameters you will have to set
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for Intercept to continue. They are:
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CLEAR SCREEN TO: This option allows you to clear the screen either to spaces
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or to inverse @ signs. Choose whichever you like best.
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BOOT MESSAGE: This option allows you to enter a 20 character long message
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that will be displayed in the center of the screen as
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Intercept loads your title program. If you do not wish to
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have a boot message displayed, just hit <ESC> at the prompt.
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TITLE FILENAME: This is where you enter the name of the file you wish to use
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for your title program. Hit ESC to catalog the drive you
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booted Intercept from.
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FILE TYPE: This option allows you to select the type of file you wish to use
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for your title program. Use P if you simply have a standard
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hi-res picture, or F if your title program is a BRUNable file.
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If you choose the P option, Intercept will load the picture and
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ask you if it's the correct one. If so, the picture will be
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packed and an unpacker will be included as part of the title
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page.
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6) DEFINING THE TRACK/SECTOR LIST: This section is where you work with the list
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of tracks and sectors on which you want your title page to be written. If
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you want to use the blank sectors found with the scan function, use option
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1 at this menu.
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OPTION 1: USE BLANK SECTORS FOUND WITH SCAN: This option will allow you to
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use any blank sectors you found with the scan function as the
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track/sector list. You will be notified if not enough sectors
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were found to accomodate Intercept's requirements.
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OPTION 2: DEFINE TRACK/SECTOR LIST MANUALLY: This option will allow you to
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manually enter a track/sector list. Intercept will automatically
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stop asking for track/sector pairs once you have entered enough
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to hold your title program plus 3 sectors for overhead.
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OPTION 3: VIEW CURRENT TRACK/SECTOR LIST: This option will allow you to view
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your current track/sector list to verify that it's correct.
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OPTION 4: EDIT LIST: This option will allow you to edit the current track/
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sector list. Use the arrow keys to select the pair that you wish
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to edit, and hit the spacebar to edit it, or D to delete it from
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the list. Note that if you delete a track/sector pair from the
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list, you may have to add a pair using option 5 in order for there
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to be enough room for Intercept to function properly.
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OPTION 5: ADD TO LIST: This option is similar to option 2, except it does
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not initialize the track/sector list to 0 entries when you select
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it.
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Once you are finished editing/defining the track/sector list, hit <ESC> to
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intercept the disk.
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7) INTERCEPTING THE DISK: Once you have completed the necessary preliminary
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steps, you will be prompted to place the disk to be intercepted in drive
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one, and to press <RETURN>. Make sure the disk to be intercepted is in
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drive one and not write protected. Intercept will attempt to place your
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title program on the disk. If an error occurs, you will be informed,
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otherwise, the message, "Intercept 1.3 has been successfully written to
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the disk" along with the ']' prompt will be displayed. I suggest that
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after you intercept a disk, you boot it and verify that it functions as it
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did before the Intercept process.
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8) NOTES: If you make a BRUNable title page program, it MUST NOT BEGIN at an
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address lower than $2400. If it does, it will interfere with Intercept.
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If it DOES begin at a location lower than $2400, but greater than $BFF, you
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may still use it, but you'll have to move it to a location higher than $2400
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and write a memory move routine to move it to where it should go. Under NO
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circumstances may a title program begin at a location lower than $C00, as
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the area from $0000-$07FF is used by the Apple internally, and the area from
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$800-$BFF is used by the Intercept 1.3 loader program.
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NOTE: If you're a GnU WaReZ KiD, you can use Intercept to add a title page
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to cracks that are already out, but let's face it...how much lower can
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you get than to steal credit for someone else's crack?
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Well, that's about it. If you've got any questions about Intercept, feel
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free to leave me mail on any of the following boards:
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Club Zero.............(213) 395-0221 Transfers ][............(514) 738-1247
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RAPS ][...............(907) 753-RAPS Halifax.................(301) 445-5897
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-The Voice Over
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Documentation completed 19, December, 1986, 11:19 PM, MDT.
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