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Move display memory back to $00 to make programming easy

This commit is contained in:
n loewen 2023-08-03 08:34:58 +01:00
parent 01be57f772
commit fdd63177f7
4 changed files with 9 additions and 8 deletions
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3
machine.config.js
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@ -1,6 +1,7 @@
module.exports = { module.exports = {
"POINTER_TO_START_OF_DISPLAY_MEM": 32,
"POINTER_TO_START_OF_KEYPAD_MEM": 33,
"INITIAL_IP_ADDRESS": 48, "INITIAL_IP_ADDRESS": 48,
"POINTER_TO_START_OF_DISPLAY_MEM": 0,
// max number of times to step the CPU, // max number of times to step the CPU,
// to stop endless loops // to stop endless loops

10
readme.md
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@ -62,11 +62,11 @@ Assemble and run, with debug output:
## Memory map / Peripherals ## Memory map / Peripherals
- `00 ` - pointer to screen memory - `00-0F` - display (4x4)
- `01 ` - pointer to keypad memory - `10-1F` - keypad? (details TBD)
- `02-0F` - reserved for future use - `20 ` - pointer to display memory
- `10-1F` - display (4x4) - `21 ` - pointer to keypad memory
- `20-2F` - keypad? (details TBD) - `22-2F` - reserved for future use / variable storage
- `30 ` - initial value for IP - `30 ` - initial value for IP
- `30-FF` - free - `30-FF` - free

2
test-programs/fill-display.asm
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@ -1,6 +1,6 @@
;; Fill display with $FF ;; Fill display with $FF
LDA $00 LDA $00 ; Start of display
STO $21 ; Pixel index STO $21 ; Pixel index
; store the $FF that we'll use to fill the screen ; store the $FF that we'll use to fill the screen

2
test-programs/relocate-display-mem.asm
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@ -1,6 +1,6 @@
;; test re-locating display memory ;; test re-locating display memory
LDA $10 LDA $10
STO $00 ; change pointer-to-display-memory to $10 STO $20 ; change pointer-to-display-memory to $10
STO $10 STO $10
STO $11 STO $11
STO $12 STO $12