xe #1
2024-12-27
Runtime detection of XE-style extended memory
Uses the "big multiplication table" in 64KB of extended memory if bank switching appears to work, otherwise uses the table of squares lookups. Initial view clocks in at 13.133 ms/px for the XE version and still 14.211 ms/px for the 400/800/XL version. Tested in emulator with 130XE and XL+Ultimate 1MB upgrade configs, and base implementation on the 800XL emulator.
2024-12-26
2024-12-25
provisional maybe
old mode runs in 81-92 cycles provisional code runs in 58-77 cycles if it works ;)
WIP imul8 via table experiments
planning to try a 64KB table of 8x7-bit multiplies in the high memory on a 130XE or other high-memory-capable machine not yet working or finished too many cycles of overhead per invocation