0d026a0fb0
* 4.77Mhz CPU clock with 33% duty cycle, thanks to @MicroCoreLabs * Peripheral clock now works at half cpu clock, for correct synchronisation with the 8253 timer, thanks to @kitune-san * Turbo option is disabled for the moment, requires a redesign of the BIU... for the to-do list
PCXT_MiSTer
PCXT port for MiSTer by spark2k06.
The purpose of this core is to implement a PCXT as reliable as possible. For this purpose, the MCL86 core from @MicroCoreLabs and KTPC-XT from @kitune-san are used.
The Graphics Gremlin project from TubeTimeUS (@schlae) has also been integrated in this first stage.
JTOPL by Jose Tejada (@topapate)
SN76489AN Compatible Implementation in VHDL Copyright (c) 2005, 2006, Arnim Laeuger (arnim.laeuger@gmx.net)
Demo
TODO
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Refactor Graphics Gremlin module, the new KFPC-XT system will make this refactor possible.
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Use SDRAM as system memory. Currently BRAM is used for everything, providing the system with 256Kb of RAM, 64Kb for the BIOS and 32Kb for VRAM.
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IDE module implementation
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Floppy implementation
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VHD support for easy integration with XTIDE Universal BIOS
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Addition of other modules:
- EMS
- Others...
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Turbo mode (7.16Mhz)
ChangeLog
Beta 0.7
- 4.77Mhz CPU clock with 33% duty cycle, thanks to @MicroCoreLabs
- Peripheral clock now works at half cpu clock, for correct synchronisation with the 8253 timer, thanks to @kitune-san
- Turbo option is disabled for the moment, requires a redesign of the BIU... for the to-do list
Beta 0.6
- UART module implementation fix, thanks to @kitune-san
Beta 0.5
- Added UART module from ao486 project (COM1 assigned to USER I/O pins)
- Automatic loading of the BIOS ROM from /games/PCXT directory
- BIOS ROM hot swapping from the OSD menu
- Updated the code to the latest version of the SDRAM module of KFPC-XT, but not yet implemented in the core... needs to be revised and improved, it does not work properly
Beta 0.4
- Added Adlib FM (JTOPL2)
- Added SN76489AN (PCjr Sound)
- Change to alternative BIOS from PCXT version 0.9.8 developed by Sergey Kiselev, with OPL FM sound card detector
Beta 0.3
- Change to KFPC-XT. The use of MCL86 and Graphics Gremlin are maintained.
- Use of Sergey Kiselev's (@skiselev) XT 8088 BIOS project.
- Turbo mode enabled, 4.77Mhz or 7.16Mhz selectable from OSD.
Beta 0.2
- PIC module downgraded to the first versions of the Next186 project, more basic and without ISR
- Possibility to activate and deactivate IRQ0 from the OSD menu, temporary feature.
Beta 0.1
- Monochrome monitor simulation option (green, amber, B&W)
Unstable version:
- Hardware interrupts are not executed.
- No VHD or SD support.
- BASIC ROM execution set in the BIOS, before the OS load routine.