tim lindner's personal blog

The second PIA has a smaller mirror in the CoCo 3 than the CoCo 1/2. It goes from $FF20 to $FF2F. The CoCo 1/2 mirror is from $FF20 to $FF3F. Recently I was challenged to find a citation for this information. But I could not.

This is a proposal to the people who make FPGA versions of the CoCo 3's GIME chip. I was recently reading about the Amiga's Copper chip. I thought something similar could be added to a GIME implementation. The following is my idea, for what it's…

I'm not a C64 guy. But I do play their games for a little show I do with my sister. Recently we played this game. https://www.lemon64.com/game/laurel-and-hardy We usually do a poor job of playing complicated game we don't know. But both of us decided to…

It was recently brought to my attention that Darren Atkinson has a really good summary of the invalid register exchange and transfer opcodes in the 6809. So good, that I should use the information to make MAME's 6809 better match real hardware. That will be…

I was recently informed of some inaccuracies with the various VDG text screens emulated in MAME. I also recently acquired an RGB2HDMI. This device is a very configurable retro computer video to HDMI device. One nice feature it has is to write the frame buffer…