New Saturn asm "add loop" benchmark for the HP48G

[Jonathan Busby]

(11-07-2023 06:12 PM)Christoph Giesselink Wrote:  Have you thought about the UMA architecture sharing the main RAM between CPU und display controller in connection with the Clarke and York chip?

Not ony keyboard polling or card detection need some extra cycles, quote from the Clarke document: "The CPU is halted for 22-23 uS every 244 uS to read the data."

To avoid this, switch off the display during program execution.

At the very beginning of the program the display is turned off via =DispOff

Also, I thought the card detection circuitry ran independently of the CPU?

Quote:Also no further information about the NSTR cycle stretching.

This seems to be undocumented and a big mystery.

Regards,

Jonathan