MegaST 1.1.3

HDMI fix for the monochrome mode and a picture fix for STEroids.

Fixed

• The monochrome mode flickered on HDMI at 720p: small columns of the desktop pattern flickered at 720p (50 and 60 Hz), while 576p was stable. The scaler's frame buffer in the HyperRAM now uses 16 bits per pixel instead of 24 (the ST has at most 4096 colours, nothing is lost) and three buffers instead of one. Confirmed fixed by a tester.
• STEroids: the picture was cut off on the left. In the monochrome mode the first pixels of every line were missing (half of the first letter); the colour modes were shifted too. Also affected the Mega STe mode with the cache on. The picture is now in its place (verified in the simulator: pixel-identical to the STe mode).

Files

The menu is unchanged: the 104 byte atarist/stcfg and the 1536 byte atarist/stmount of 1.1 stay valid. Coming from 1.0 or older: copy the new atarist/stcfg from the zip.

File	Board	Status
MegaST-R6-v1.1.3.cor	MEGA65 R6	developer's board
MegaST-R5-v1.1.3.cor	MEGA65 R5	not tested yet, please report
MegaST-R4-v1.1.3.cor	MEGA65 R4	not tested yet, please report
MegaST-R3-v1.1.3.cor	MEGA65 R3/R3A (no SDRAM)	working on an R3A and an R3 (#2, #22); 512 KB ST RAM, no Viking, no STEroids

Known limitations: the real floppy drive is read only and DD only; the right button of an Atari mouse is a short click only and works about once every 10 seconds (#17); a tester saw some programs crash with 8 MB of ST RAM on an STe (4 MB works). The Mega STe mode starts at 8 MHz like a real Mega STE; set 16 MHz and the cache in XControl (as always before installing system software, back up your hard disk image first).

All changes: VERSIONS.md, manual: README.

MegaST is free and open source. If you enjoy it, you can support its development via Buy Me a Coffee or GitHub Sponsors.