+ CHIBI PC-09 Technical Specification
+5-17-21 Amber Zeller
+Quick Specs
+CPU
+1, 1.5, 2 MHz Motorola 6809
+Memory
+64k SRAM on external card for optional MMU capability. Seperated into 2k blocks, numbered 0-31. Only 62k of memory is accessible, due to the I/O block.
+I/O
+2k block, position 30. Addresses EFFF-F7FE. Further subdivided into 128 devices of 16 addresses each.
+Address Space Diagram
+
+
+
+| Address Range |
+Description |
+
+
+
+
+| 0000 - 07FF |
+First Kernel Block |
+
+
+| 0800 - EFFE |
+Standard Memory Blocks |
+
+
+| EFFF - F7FE |
+I/O Block |
+
+
+| F7FF - FFFF |
+Reset Vectors |
+
+
+
+I/O Block Description
+11 bits per block
+128 devices are possible, though will likely never be used.
+
+
+
+| Bits |
+Description |
+
+
+
+
+| 0-6 |
+Device selection |
+
+
+| 7-10 |
+Address selection |
+
+
+
+Expansion Card Description
+Byte 0 of every card should contain a 'type' descriptor.
+
+
+
+| Type Descriptor |
+Description |
+Example |
+
+
+
+
+| 00 |
+Block Storage |
+SD Card |
+
+
+| 01 |
+ANSI I/O Stream |
+UART |
+
+
+| 02 |
+ANSI Compatible Graphics Device |
+VGA64 |
+
+
+
+
+
+
+
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diff --git a/docs/chibi_pc-09_technical_specification.md b/docs/chibi_pc-09_technical_specification.md
new file mode 100644
index 0000000..f3dfa9a
--- /dev/null
+++ b/docs/chibi_pc-09_technical_specification.md
@@ -0,0 +1,47 @@
+# CHIBI PC-09 Technical Specification
+
+5-17-21 Amber Zeller
+
+## Quick Specs
+
+#### CPU
+
+1, 1.5, 2 MHz Motorola 6809
+
+#### Memory
+
+64k SRAM on external card for optional MMU capability. Seperated into 2k blocks, numbered 0-31. Only 62k of memory is accessible, due to the I/O block.
+
+#### I/O
+
+2k block, position 30. Addresses EFFF-F7FE. Further subdivided into 128 devices of 16 addresses each.
+
+## Address Space Diagram
+
+| Address Range | Description |
+| ------------- | ---------------------- |
+| 0000 - 07FF | First Kernel Block |
+| 0800 - EFFE | Standard Memory Blocks |
+| EFFF - F7FE | I/O Block |
+| F7FF - FFFF | Reset Vectors |
+
+## I/O Block Description
+
+11 bits per block
+
+128 devices are possible, though will likely never be used.
+
+| Bits | Description |
+| ---- | ----------------- |
+| 0-6 | Device selection |
+| 7-10 | Address selection |
+
+## Expansion Card Description
+
+Byte 0 of every card should contain a 'type' descriptor.
+
+| Type Descriptor | Description | Example |
+| --------------- | ------------------------------- | ------- |
+| 00 | Block Storage | SD Card |
+| 01 | ANSI I/O Stream | UART |
+| 02 | ANSI Compatible Graphics Device | VGA64 |
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+# VGA64 Technical Specifications
+
+5-7-21 Amber Zeller
+
+Outputs 320x200 VGA output over 640x480 by linedoubling and halving the pixel clock and adding 80 pixels to vblank.