M100/T102 Hardware scrolling patch: Difference between revisions
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March 2022 | '''Updated March 2022''' | ||
The Model 100 and Tandy 102 (as well as KC-85, NEC and M10 machines) all have top and bottom LCD drivers that are capable of hardware scrolling. However the main ROM does not take advantage of that; it manually writes new screen data to every pixel to accomplish a scroll. | The Model 100 and Tandy 102 (as well as KC-85, NEC and M10 machines) all have top and bottom LCD drivers that are capable of hardware scrolling. However the main ROM does not take advantage of that; it manually writes new screen data to every pixel to accomplish a scroll. | ||
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|'''Version'''||'''Note'''||'''File''' | |'''Version'''||'''Note'''||'''File''' | ||
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|Version 2|| patch source, incl. TS-DOS bug-fix - March 2022 ||[[Media:M102_hs.ZIP|M102_hs.ZIP]] | |Version 2, March 2022|| patch source, incl. TS-DOS bug-fix - March 2022 ||[[Media:M102_hs.ZIP|M102_hs.ZIP]] | ||
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|Version 2|| Word document that describes the patch in detail ||[[Media:hs_patch_doc.ZIP|hs_patch_doc.ZIP]] | |Version 2, March 2022|| Word document that describes the patch in detail ||[[Media:hs_patch_doc.ZIP|hs_patch_doc.ZIP]] | ||
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Revision as of 04:39, 11 March 2022
Updated March 2022
The Model 100 and Tandy 102 (as well as KC-85, NEC and M10 machines) all have top and bottom LCD drivers that are capable of hardware scrolling. However the main ROM does not take advantage of that; it manually writes new screen data to every pixel to accomplish a scroll.
A patch has been developed now that provides an implementation of hardware scrolling. It is not a major rewrite of the LCD routines, but it modifies how the existing routines work to speed up scrolling using the hardware scroll function.
The overall patch consists of a first patch that creates about 150 free bytes in the main ROM, and then the hardware scrolling patch is implemented on top of that.
Note. The so-called "base patch" is also used to enable NSC800 support.
A document that describes the patch is here. The Tandy 102 main ROM with the 2 patches applied, is here.
| Version | Note | File |
| Version 2, March 2022 | patch source, incl. TS-DOS bug-fix - March 2022 | M102_hs.ZIP |
| Version 2, March 2022 | Word document that describes the patch in detail | hs_patch_doc.ZIP |
