amberisvibin/chibi-pc09
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fix naming inconsistency in readme

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Amber
2021-05-07 23:01:30 -04:00
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README.md
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@@ -10,7 +10,7 @@ The pc-09 will be an extremely expandable Motorola 6809 based microcomputer that
- The 6829 MMU creates 4 different address spaces, with the kernal occupying address space 0. With the MMU, only the kernal process will need the I/O and Kernal Root Blocks. Multiple MMUs can be combined to create up to 32 address spaces. The MMU has a 10-bit output, but the maximum amount of addressable RAM will be 1mb, as the upper address line is used for marking r/rw, as outlined in the 6829 datasheet.
- The I/O Block is sub-divided into 128 devices, with 16 addresses each. Address 0 will be a type indicator, so that the coldboot ROM can address it with a defined protocol.
- The I/O Block is sub-divided into 128 devices, with 16 addresses each. Address 0 will be a descriptor, so that the coldboot ROM can address it with a defined protocol.
- The graphics system will be more advanced than most homebrew computer projects. It will have a custom TTL logic graphics card that will be able to display 320x200 in 256 colours over VGA. There will be 64k of double-buffered VRAM, interfaced via commands. The buffer will not copy unless a 'done' command is sent. This way, if the frame is not ready, the previous frame will be displayed, preventing tearing. These commands will include an auto-increment function, allowing entire bitmaps to be copied with ease. It will also have a text mode, utilizing bitmap copy from the character ROM. [SUBJECT TO CHANGE]