Brendan Robert
2db2129806
Implement additional hardware-accelerated functions using trig identities
...
Extended hardware acceleration to more functions by using mathematical
identities with the base MegaFlash FPU operations:
New Functions (all hardware-accelerated):
- neg(x) = x * -1 (preserves precision vs sign flip)
- abs(x) = sign check + neg if needed
- log2(x) = ln(x) / ln(2)
- pow2(x) = e^(x * ln(2))
- asin(x) = atan(x / sqrt(1 - x²))
- acos(x) = π/2 - asin(x)
- sinh(x) = (e^x - e^-x) / 2
- cosh(x) = (e^x + e^-x) / 2
- tanh(x) = sinh(x) / cosh(x)
- sec(x) = 1 / cos(x)
- csc(x) = 1 / sin(x)
- cot(x) = 1 / tan(x)
All functions use hardware mul, div, sqrt, sin, cos, tan, atan, ln, and exp
operations from MegaFlash, providing significant speedup over software
implementations.
Updated documentation to reflect extended hardware acceleration coverage.
2026-01-24 17:49:32 -06:00
Brendan Robert
a4fa5a162a
Fix spelling: Thomas Fok (not Tomas)
2026-01-24 17:42:43 -06:00
Brendan Robert
680a1c032b
Update MegaFlash repository link to https://github.com/ThomasFok/MegaFlash
2026-01-24 17:41:56 -06:00
Brendan Robert
9555036473
Fix attribution: MegaFlash hardware by Tomas Fok
2026-01-24 17:41:28 -06:00
Brendan Robert
3103d44635
Add MegaFlash hardware-accelerated FPU library (fpu_mf)
...
This commit adds optional hardware floating-point acceleration for PLASMA
programs running on Apple IIc/IIc+ systems with MegaFlash storage devices.
New Features:
- fpu_mf.pla: Drop-in replacement for fpu.pla with hardware acceleration
- API-compatible with existing fpu.pla library
- Automatic hardware detection and transparent SANE fallback
- 10-100x speedup for transcendental functions (sin, cos, tan, log, exp)
- 3-5x speedup for multiplication and division
New Files:
- src/inc/megaflash.plh: MegaFlash hardware constants
- src/libsrc/fpu_mf.pla: Hardware-accelerated FPU library
- src/libsrc/README_fpu_mf.md: Library documentation
- src/samplesrc/fptest_mf.pla: Comprehensive test program
- MEGAFLASH_FPU.md: Integration overview and PR documentation
Usage:
Users can switch from 'import fpu' to 'import fpu_mf' with no other
code changes required. Programs work on all systems (with or without
MegaFlash hardware).
Backwards Compatibility:
- No changes to existing PLASMA code
- Opt-in only - existing programs unchanged
- Works on all Apple II systems (fallback to SANE if no hardware)
Technical Details:
- Automatic format conversion (SANE Extended <-> MBF)
- Hardware operations: mul, div, sqrt, sin, cos, tan, atan, ln, exp
- SANE fallback for unsupported operations
- MegaFlash detection via ID register ()
See MEGAFLASH_FPU.md for complete documentation.
2026-01-24 17:36:30 -06:00
David Schmenk
e2ef600dd2
Add visibility algorithm to solving
2026-01-24 13:24:04 -08:00
David Schmenk
e22ad3e3c1
Updaate the update image
2026-01-08 14:41:50 -08:00
David Schmenk
3a03bbd5f8
Add self booting MAZE RUNNER disk image
2026-01-03 15:00:54 -08:00
David Schmenk
51a33d5750
Timer divisor measured on actual //c
2026-01-03 14:56:37 -08:00
David Schmenk
a9befc3b37
Improved maze generation and timer result
2026-01-03 13:59:08 -08:00
David Schmenk
e968a5911f
Further random number improvements
2026-01-02 20:04:45 -08:00
David Schmenk
2522d1faab
Play again option
2026-01-02 17:47:17 -08:00
David Schmenk
2239b6de9e
Force 40 column mode before HGR
2026-01-02 15:56:01 -08:00
David Schmenk
0424867ead
Maze game and improve random numbers
2026-01-02 14:39:51 -08:00
David Schmenk
0d4b0f9607
Change autorun script
2026-01-01 11:02:50 -08:00
David Schmenk
6bc88b8f7d
Change volume label
2025-12-30 19:14:05 -08:00
David Schmenk
ff175b5d1e
Script cleanup
2025-12-30 08:33:30 -08:00
David Schmenk
dd545c7aa5
Improve starbusrt visual
2025-12-29 16:32:02 -08:00
David Schmenk
102b1ef652
Happy New Year 2026 demo
2025-12-29 13:43:58 -08:00
David Schmenk
c143596032
run turtle graphics demo in PLFORTH disk image
2025-12-22 07:29:47 -08:00
David Schmenk
e3550d4a83
Add fixed point move routine and sample
2025-12-21 17:27:53 -08:00
David Schmenk
d6a51f4656
Update turtle graphics sample
2025-12-20 21:40:15 -08:00
David Schmenk
5830f8b34e
Add to turtle graphics demo
2025-12-20 15:08:32 -08:00
David Schmenk
eafd2df444
Fix resetting of lastsym after execmod
2025-12-20 13:38:36 -08:00
David Schmenk
fffb06b8b3
Add TXTMODE word
2025-12-20 09:21:51 -08:00
David Schmenk
34bc475d16
Add TXTMODE word
2025-12-20 09:18:41 -08:00
David Schmenk
b9c84db58e
Update sample code
2025-12-19 15:20:29 -08:00
David Schmenk
2d419672e0
Tweak line clip outcode checks
2025-12-15 20:15:59 -08:00
David Schmenk
ca6bad1068
Update plasma.4th
2025-12-15 19:22:09 -08:00
David Schmenk
b3f980b330
Update 2.21 files
2025-12-15 18:54:53 -08:00
David Schmenk
8da58ce734
Update grturtle.4th script
2025-12-13 14:51:12 -08:00
David Schmenk
9c76ea92c3
Simplify turtle API
2025-12-11 18:28:45 -08:00
David Schmenk
d35774eac4
Use high precision cos for RGB->DHGR Conversion
...
Add some raster op routines for FORTH turtle graphcis
2025-12-10 15:23:30 -08:00
David Schmenk
f987458a15
Use fractional coordinates to improve angular movement accuracy
2025-12-09 09:47:34 -08:00
David Schmenk
1286daff45
Why am I having problems editing this script?
2025-12-07 14:57:52 -08:00
David Schmenk
9891eec8cd
Why haven't I ever had the problem with the filename before?
2025-12-07 14:39:06 -08:00
David Schmenk
2955e07d93
Fix TEXT hack to check that it is already defined
2025-12-04 04:36:44 -08:00
David Schmenk
786bb692f6
Hack fix for crashing textmode set from hgrlib
2025-12-04 04:28:51 -08:00
David Schmenk
c4b98f1866
Increase symbol table and increase free memory for 64K VM
2025-12-03 19:57:24 -08:00
David Schmenk
6b4017abb1
Fix extended clip line error and add mixed hires mode turtle
2025-12-03 09:02:22 -08:00
David Schmenk
1413ddd30a
Fix sin/cos accuracy
2025-12-02 17:51:09 -08:00
David Schmenk
73bf667236
make FORTH callable from PLASMA
2025-12-02 16:28:51 -08:00
David Schmenk
1dd707dcee
Remove unused tilebuf init
2025-12-02 10:01:51 -08:00
David Schmenk
43c5ed5839
Break out HGR libraries into separate includes for memory savings
2025-12-02 09:59:34 -08:00
David Schmenk
ca87c5b678
Update turtle test
2025-12-01 19:55:16 -08:00
David Schmenk
af2e3143f6
Add rounding to sin/cos calc to improve accuracy
2025-12-01 19:24:44 -08:00
David Schmenk
15488e61c7
Add hires turtle graphics sample
2025-12-01 17:51:04 -08:00
David Schmenk
4172c2c5e4
Move and increase symbol table
2025-12-01 16:53:04 -08:00
David Schmenk
77b94b0339
Initial turtle graphics library
2025-12-01 11:06:58 -08:00
David Schmenk
35dd0f0eb5
add SINCOS include
2025-11-30 13:58:45 -08:00
