more notes + datasheets

notes/cpu.md

@@ -0,0 +1,10 @@
+# CPU board
+
+## Components
+- CPU: [W65C02](../datasheets/w65c02s.pdf)
+- RAM: [LY62256PL-5LL](../datasheets/LY62256PL-55LL.pdf)
+- ROM: [AT28C64B](../datasheets/AT28C64B.pdf)
+- Register: [74HC377](../datasheets/74HC_HCT377.pdf)
+
+## Timings
+- PHI2 target: 10MHz -> 100ns

notes/memory-layout.md

@@ -2,6 +2,7 @@
 - bank switching using 8-Bit register
 - top 32K remain untouched
 
+# [CPU](./cpu.md)
 | start  | end    | use                     |
 | :----- | :----- | :---------------------- |
 | 0x0000 | 0x5FFE | RAM                     |
@@ -9,7 +10,7 @@
 | 0x6000 | 0xDFFF | --- to be mapped ---    |
 | 0xE000 | 0xFFFF | ROM                     |
 
-# Default (0X00)
+# I/O (0x00)
 | start  | end    | use |
 | :----- | :----- | :-- |
 | 0x6000 | 0xDFFF | I/O |