Re:Why does the Commodore C128 perform poorly when running C...
by greenbit on Saturday December 10, 2022 @09:48AM
(#33933056)
In the PDF at the link you provided, I found what you're referring to at page 311 (in-document numbering) which is page 321 per my pdf viewer.
So, yes, it did auto increment. I think what happened is that after 35 years, I just recalled my initial aggravation with addressing the 8563's RAM through that keyhole of R18, R19, R31.
But .. looking around in the ol PRG, and finding some of Mr Herd's "choice comments" out on the web, I'd still say the 8563 was a dog. Case in point, having to poll D600 for bit 7 to become set just to make sure the 8563 had cottoned onto your request to set a register.
That bottleneck to get to the 8563's RAM was not fun. The bottleneck to get into the 8563s own registers was even goofy. Why not just map them to D600-D61F ?
So, yes, it did auto increment. I think what happened is that after 35 years, I just recalled my initial aggravation with addressing the 8563's RAM through that keyhole of R18, R19, R31.
But .. looking around in the ol PRG, and finding some of Mr Herd's "choice comments" out on the web, I'd still say the 8563 was a dog. Case in point, having to poll D600 for bit 7 to become set just to make sure the 8563 had cottoned onto your request to set a register.
That bottleneck to get to the 8563's RAM was not fun. The bottleneck to get into the 8563s own registers was even goofy. Why not just map them to D600-D61F ?