xe #1

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brooke merged 10 commits from xe into main 2024-12-28 02:40:02 +00:00

Conversation 0 Commits 10 Files changed 2 +459 -41

brooke commented 2024-12-28 02:39:47 +00:00

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brooke added 10 commits 2024-12-28 02:39:48 +00:00

WIP imul8 via table experiments ... 405cec6d51

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

provisional maybe ... f996c3cbcd

old mode runs in 81-92 cycles

provisional code runs in 58-77 cycles

if it works ;)

:P 829d2860e8

first draft initializer a9d551a98d

builds, not used yte 34ce9da030

called, gets lost 45c5a4cb2d

runs but doesn't work 0cde31905e

tweaks: e84a990789

it works ee1c268705

Runtime detection of XE-style extended memory ... 83cba4afa3

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.

brooke merged commit 052a19b6aa into main 2024-12-28 02:40:02 +00:00

brooke referenced this pull request from a commit 2024-12-28 02:40:03 +00:00

Merge pull request 'xe' (#1) from xe into main

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Reference: brooke/mandel-6502#1

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