.DIALS LDA #%00001111 \ Set bits 1 and 2 of the Access Control Register at STA VIA+&34 \ SHEILA &34 to switch screen memory into &3000-&7FFF LDA #1 \ Set location &DDEB to 1. This location is in HAZEL, STA &DDEB \ which contains the filing system RAM space, though \ I'm not sure what effect this has LDA #&A0 \ Set SC(1 0) = &71A0, which is the screen address for STA SC \ the character block containing the left end of the LDA #&71 \ top indicator in the right part of the dashboard, the STA SC+1 \ one showing our speed JSR PZW2 \ Call PZW2 to set A to the colour for dangerous values \ and X to the colour for safe values, suitable for \ non-striped indicators STX K+1 \ Set K+1 (the colour we should show for low values) to \ X (the colour to use for safe values) STA K \ Set K (the colour we should show for high values) to \ A (the colour to use for dangerous values) \ The above sets the following indicators to show red \ for high values and yellow/white for low values LDA #14 \ Set T1 to 14, the threshold at which we change the STA T1 \ indicator's colour LDA DELTA \ Fetch our ship's speed into A, in the range 0-40 JSR DIL-1 \ Draw the speed indicator using a range of 0-31, and \ increment SC to point to the next indicator (the roll \ indicator)Name: DIALS (Part 1 of 4) [Show more] Type: Subroutine Category: Dashboard Summary: Update the dashboard: speed indicator Deep dive: The dashboard indicatorsContext: 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: * Main game loop (Part 5 of 6) calls DIALS
This routine updates the dashboard. First we draw all the indicators in the right part of the dashboard, from top (speed) to bottom (energy banks), and then we move on to the left part, again drawing from top (forward shield) to bottom (altitude). This first section starts us off with the speedometer in the top right.
Entry point DIL-1 in subroutine DILX (category: Dashboard)
The range of the indicator is 0-32 (for the speed indicator)
Subroutine PZW2 (category: Dashboard)
Fetch the current dashboard colours for non-striped indicators, to support flashing
Configuration variable: VIA = &FE00
Memory-mapped space for accessing internal hardware, such as the video ULA, 6845 CRTC and 6522 VIAs (also known as SHEILA)