The BR1 (Part 1 of 2) subroutine - Elite on the BBC Micro and NES

       Name: BR1 (Part 1 of 2)                                       [Show more]
       Type: Subroutine
   Category: Start and end
    Summary: Show the "Load New Commander (Y/N)?" screen and start the game
    Context: See this subroutine in context in the source code
 Variations: See code variations for this subroutine in the different versions
 References: This subroutine is called as follows:
             * TT102 calls via QU5


 BRKV is set to point to BR1 by the loading process.

 Other entry points:

   QU5                  Restart the game using the last saved commander without
                        asking whether to load a new commander file


.BR1

 JSR ZEKTRAN            \ Call ZEKTRAN to clear the key logger

 LDA #3                 \ Set XC = 3 (set text cursor to column 3)
 STA XC

\JSR startat            \ This instruction is commented out in the original
                        \ source

 LDX #CYL               \ Call TITLE to show a rotating Cobra Mk III (#CYL) and
 LDA #6                 \ token 6 ("LOAD NEW {single cap}COMMANDER {all caps}
 LDY #200               \ (Y/N)?{sentence case}{cr}{cr}"), with the ship at a
 JSR TITLE              \ distance of 200, returning with the internal number
                        \ of the key pressed in A

 CPX #'Y'               \ Did we press "Y"? If not, jump to QU5, otherwise
 BNE QU5                \ continue on to load a new commander

\JSR stopat             \ This instruction is commented out in the original
                        \ source

 JSR DFAULT             \ Call DFAULT to reset the current commander data block
                        \ to the last saved commander

 JSR SVE                \ Call SVE to load a new commander into the last saved
                        \ commander data block

\JSR startat            \ This instruction is commented out in the original
                        \ source

.QU5

 JSR DFAULT             \ Call DFAULT to reset the current commander data block
                        \ to the last saved commander

[X]

Configuration variable CYL = 11

Ship type for a Cobra Mk III

[X]

Subroutine DFAULT (category: Start and end)

Reset the current commander data block to the last saved commander

[X]

Entry point QU5 in subroutine BR1 (Part 1 of 2) (category: Start and end)

Restart the game using the last saved commander without asking whether to load a new commander file

[X]

Subroutine SVE (category: Save and load)

Display the disc access menu and process saving of commander files

[X]

Subroutine TITLE (category: Start and end)

Display a title screen with a rotating ship and prompt

[X]

Variable XC in workspace ZP

The x-coordinate of the text cursor (i.e. the text column), which can be from 0 to 32

[X]

Subroutine ZEKTRAN (category: Keyboard)

Clear the key logger

Start and end: BR1 (Part 1 of 2)

[BBC Master version]