Thanks to this change, some parts of the area5150 demo that didn't look right, like the dancing elephant, are now displayed correctly.
Thanks @somhi for noticing this detail.
* changed chipset clock to 50 mhz.
* Added false_path.
* Change peripheral_clock signal.
* Added F/F to the write process to the EMS memory to resolve timing co…
* Add 2-stage F/F between bus and video module.
* Changed 8253 timer_clock signal.
* Fixed F/F clocks.
* Rewiring with sn76489
* Temporary removal of the signal from tandy_snd_rdy
* Fix bug of the access to the CS signal in Tandy sound module
* In tandy mode, the keyboard reset signal is not used
* Added new IORQ signal
* Restructuring of the OSD menu
* Added DSS/Covox support
* UART port speed increase to 921.6Kbps
* CGA Mode Detection 320x200x4
* Add video monochrome converter module
* Integrate module into core + OSD menu tweaks
* Fix COVOX OSD option
Model selection is now allowed, between IBM PCXT and Tandy 1000, video selection reverts to CGA/Tandy or MDA.
The Tandy 1000 model would be intended for BIOSes of this type, and the IBM PCXT model, the same.
* Unified chipset clock at 100 MHz.
* Changed read signal to uart module.
* Changed cen_opl2 signal.
* Improved access speed to SDRAM.
* Control sdram refresh execution timing.
* Fixed KF8237.
* Wired between Timer 1 output and DMA0 request.
* Fix VRAM CGA and loader for XTIDE.
* IBM5160 BIOS downloader.
* Fix indentations in make_boot_with_ibm5160.
* Tandy graphics selectable from the OSD.
* EMS pages frame update.
* fix a comment on addressable memory.
* boot.rom up to 64Kb + 16Kb for XTIDE.
* Dummy LPT1.
* Update of ROM download scripts.
* Simple improvements to PCXT.sdc.
* Correct use of address_enable_n signal in ports and memory accesses.
* Initial improvements in Tandy sound implementation.
* Improvements to the implementation of Tandy video
