The Z180 has 8x8=16 MLT instructions, but since the bus is Z80 compatible, it is not as fast as the KL5C80, which has an improved bus. asciinema.org/a/758967

Correction: The bus speed is about 1.6MHz. "Just over 3MHz" is the XTAL frequency.

The KL5C80 can only use interrupt mode 2, so it was not possible to share all programs with the Z80 or NSC800. Should I rewrite everything in mode 2?

asciinema.org/a/757524

The other chip I bought at the same time is broken and doesn't work.
This chip also behaves strangely when responding to the first interrupt; it doesn't look at the interrupt vector and eventually resets. From the second interrupt onwards, it works as expected.
I wonder if this chip is broken too.

006PとTLR103と抵抗をエポキシ樹脂で固めて、布団に潜ってニヤニヤ眺めてたなぁ。

TMS9900 brothers all together.

asciinema.org/a/697736

時代物ですが、巷説シリーズが読みやすくておすすめです。

asciinema.org/a/706881