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View Code? Open in Web Editor NEWTMS9918A emulator library (C99)
License: MIT License
TMS9918A emulator library (C99)
License: MIT License
Current implementation can inadvertently erase the current vram address if you:
VDP has now overwritten lower byte of vram address. According to this hardware deep-dive, changes are only committed on successful pairs.
According to this hardware deep-dive VDP hardware uses a read-ahead buffer for speed and other reasons. This results in some interesting behavior if you mix reads and writes. Most obviously:
Due to the read-ahead buffer, you will get back the written value, you will not get the value advanced by the pointer. There are other behavioral oddities here as well regarding how read and write deals with the vram pointer.
When reading:
When writing:
I have verified this with my own hardware but worth checking on yours as well. I'm using TMS9128.
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