(issues) issues - Add "execute JMP FF on startup" issue

notes/issues/issues.md

@@ -17,4 +17,30 @@ Full list of flags I want:
     -p --prettydisplay
     -mc --machinecode
 
+### #2 - Startup: Execute `JMP $FF`
+
+See [2023-08-24](../2023-08-24--dev-notes.md#cpu-start-up)
+
+... say that there's a 1-byte ROM at $FF.
+
+- `00-19` - display (5x5)
+- `1A   ` - pointer to display memory
+- `1B   ` - keypad: value of latest key pressed
+- `1C   ` - reserved for future use (bank switching flag)
+- `1D   ` - initial IP
+- `1D-FE` - free
+- `FF   ` - ROM (unwriteable) - pointer to initial IP
+
+- store `$1D` at `$FF`
+- make CPU execute `JMP $FF` on startup
+- make ROM unwriteable
+
+More step-by-step:
+
+  - Change memory from a Uint8Array to a regular array,
+    and make every entry { number | { type: 'ROM', value: number }}
+  - Store ROM as an object in machine.config.js
+  - Load ROM data into memory at CPU startup (`startCPU(RAM, ROM)`)
+
+
 ## Closed