! Feature: Change to a 5x5 display [breaking change]

display.js

@@ -7,8 +7,8 @@ const { num2hex } = require('./logging.js');
  **/
 const printDisplay = (mem) => {
   const disp = mem[POINTER_TO_START_OF_DISPLAY_MEM];
-  for (let i = disp; i < disp + 16; i += 4) {
-    console.log(`${num2hex(mem[i])} ${num2hex(mem[i+1])} ${num2hex(mem[i+2])} ${num2hex(mem[i+3])}`);
+  for (let i = disp; i < disp + 25; i += 5) {
+    console.log(`${num2hex(mem[i])} ${num2hex(mem[i+1])} ${num2hex(mem[i+2])} ${num2hex(mem[i+3])} ${num2hex(mem[i+4])}`);
   }
 }
 
@@ -19,8 +19,8 @@ const printDisplay = (mem) => {
 const prettyPrintDisplay = (mem) => {
   const disp = mem[POINTER_TO_START_OF_DISPLAY_MEM];
   const num2pic = (n) => n > 0 ? '⚫' : '⚪';
-  for (let i = disp; i < disp + 16; i += 4) {
-    console.log(`${num2pic(mem[i])}${num2pic(mem[i+1])}${num2pic(mem[i+2])}${num2pic(mem[i+3])}`);
+  for (let i = disp; i < disp + 25; i += 5) {
+    console.log(`${num2pic(mem[i])}${num2pic(mem[i])}${num2pic(mem[i+1])}${num2pic(mem[i+2])}${num2pic(mem[i+4])}`);
   }
 }
 

machine.config.js

@@ -1,11 +1,11 @@
 module.exports = {
   "START_OF_DISPLAY_MEM": 0,
-  "POINTER_TO_START_OF_DISPLAY_MEM": 32,
-  "POINTER_TO_START_OF_KEYPAD_MEM": 33,
+  "POINTER_TO_START_OF_DISPLAY_MEM": 33,
+  "POINTER_TO_START_OF_KEYPAD_MEM": 34,
   "INITIAL_IP_ADDRESS":  48,
 
   // max number of times to step the CPU,
   // to stop endless loops
   // 0 = infinite
-  "CYCLE_LIMIT": 128,
+  "CYCLE_LIMIT": 256,
 }

readme.md

@@ -62,11 +62,11 @@ With verbose debugging output:
 
 ## Memory map / Peripherals
 
-- `00-0F` - display (4x4)
-- `10-1F` - keypad? (details TBD)
-- `20   ` - pointer to display memory
-- `21   ` - pointer to keypad memory
-- `22-2F` - reserved for future use / variable storage
+- `00-19` - display (5x5)
+- `20   ` - keypad (details TBD)
+- `21   ` - pointer to display memory
+- `22   ` - pointer to keypad memory
+- `23-2F` - reserved for future use / variable storage
 - `30   ` - initial value for IP
 - `30-FF` - free
 

test-programs/fill-display.asm

@@ -1,23 +1,27 @@
 ;; Fill display with $FF
+; updated for 5x5 display
+
+=pixelIndex $24
+=pixelFill $25
 
 LDA $00 ; Start of display
-STO $21 ; Pixel index
+STO =pixelIndex
 
-; store the $FF that we'll use to fill the screen
 LDA $FF
-STO $22
+STO =pixelFill
 
 @copy-to-display
-  LDA ($22) ; A = mem[$22] = $FF
-  STO ($21) ; mem[mem[$21]] = A = $FF
+  LDA ($25) ; A = mem[$25] = $FF
+  STO ($24) ; update pixel ... mem[mem[$24]] = A = $FF
 
 ; increment pixel index
-LDA ($21)
+LDA ($24)
 ADD $01
-STO $21
+STO =pixelIndex
 
-; if CF is set, then the display is full and we're done
-FHP 0
+LDA ($24) ; pixelIndex
+SUB $19   ; if pixelIndex - $19 == 0, we've reached the end
+FHP 2     ; Zero flag is #2
   JMP @copy-to-display
 
 END