amberisvibin/chibi-pc09
Archived
1
0
Fork 1
Code Issues Pull Requests Activity

add more detail to tech specs

Browse Source
This commit is contained in:
Amber Zeller
2021-05-07 23:02:02 -04:00
parent 222f0a33f8
commit 0b3f9f4703
2 changed files with 47 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
docs/chibi_pc-09_technical_specification.md
View File

@@ -20,10 +20,10 @@
| Address Range | Description |
| ------------- | ---------------------- |
| 0000 - 07FF | First Kernel Block |
| 0000 - 07FF | Kernal Root Block |
| 0800 - EFFE | Standard Memory Blocks |
| EFFF - F7FE | I/O Block |
| F7FF - FFFF | Reset Vectors |
| F7FF - FFFF | Vector Block |
## I/O Block Description
@@ -38,10 +38,18 @@
## Expansion Card Description
Byte 0 of every card should contain a 'type' descriptor.
Byte 0 of every card should contain a descriptor. The structure of the descriptor is described in the following table.
| Type Descriptor | Description | Example |
| --------------- | ------------------------------- | ------- |
| 00 | Block Storage | SD Card |
| 01 | ANSI I/O Stream | UART |
| 02 | ANSI Compatible Graphics Device | VGA64 |
| Bits | Descriptor |
| ---- | ---------- |
| 0-2 | Type |
### Type Descriptor Table
| Type Descriptor | Description | Example |
| --------------- | ------------------------------- | -------- |
| 000 | Block Storage | SD Card |
| 001 | ANSI I/O Stream | UART |
| 010 | ANSI Compatible Graphics Device | VGA64 |
| 011 | Input Device | Keyboard |
| 1xx | Other | Other |