Denjhang Liu's repositories
OPLSynth
I spent a lot of time experimenting with the OPL3 Bank Editor, starting from the DMXOPL3 sound bank and gradually approaching the sound of a real instrument. To make the 2x2op sound of OPL3 close to the sound of real instruments, in addition to repeated experiments, it also requires perceptual knowledge of OPL3 FM synthesis.
MegaGRRL-Desktop-Mini-USB
I have been using the desktop version of MegaGRRL for 4 years. As my PCB drawing skills improve, I have the confidence to realize all my ideas and changes. This version is based on the Type-C version and includes a lot of practical modifications.
MAmidiMEmo
MAmidiMEmo
MegaMod-Firmware
Various MegaGRRL MegaMod firmwares after sorting.
MSX-Mega-Mapper-4mb
8bit4ever megamapper 4mb reverse engineering.
MSX-nano-mouse-2024
The latest version of the hardware is v0.4, which uses a blue plastic DB9 female connector directly welded to the PCB
OPM-MegaMod-v0.4
OPM music module with volume control, great sound quality.
OPN-OPLL-MegaMod-v0.4
The optimized OPN+OPLL music module removes many useless diodes, combines the design of RE2-YM2413, and uses copper to isolate the digital and analog grounds, which greatly reduces noise.
PS98-YMF297
Functionally verified RE: Birth 2nd sound card. Since this project is completely derived from ps98, it is named PS98-YMF297. Currently it only supports OPN3 (YMF288) compatibility mode. I don’t know yet how to turn on OPL3 compatibility mode.
RE2-AY8910-YMZ284
The functionally verified RE: Birth 2nd sound card highly refers to the AY-3-8910 schematic diagram of the PS98 project, especially the chip select decoding part and the crossover switching part (of course it also refers to RE1-AY89XX).
RE2-SN76489
The design of RE2-SN76489 has been integrated into RE2-YM3438+SN76489
RE2-YM2151
Functionally verified RE: Birth 2nd sound card. This project refers to the YM2151 audio circuit disclosed by SPFM FM Tower. The highlight is that it supports the use of universal dual operational amplifiers (such as NE5532, TL072) under a single 5V power supply. After multiple versions of repairs, Everything is as good as RE1-YM2151
RE2-YM2203
Functionally verified RE: Birth 2nd sound card. This project refers to RE2-YM3812 (and of course RE1-YM2203). The feature of this project is the addition of a stereo PSG adjustment switch. This function was first used in various sound cards with PSG. MegaMod, the stereo PSG circuit refers to the audio circuit of ZX Spectrum.
RE2-YM2413
Functionally verified RE: Birth 2nd sound card. This project refers to the YM2413 audio circuit of the PS98 project. The highlight is the use of differential amplification (instead of the inverting addition used by FMPAC) to mix the MO and RO together and cancel all busses. noise and power supply noise, making this design excellent.
RE2-YM2608
Functionally proven RE:Birth 2nd sound card, this project references the YM2608 part of the SPFM FM tower (and of course the RE1-YM2608).
RE2-YM3438-SN76489
The proven RE: Birth 2nd sound card supports welding on either of the two chips YM2612/3438. The OPN2/2C audio switching circuit refers to the design of MegaGRRL. SN76489 is also supported, but a second PCB is required to introduce BSEL1 as the chip select signal for SN76489.
RE2-YMF276-288-289
The proven RE2 sound card supports welding on any one of the three chips YMF276/288/289.
BBDown-Batch-Downloader
简易的批量下载程序，主要用于下载某个up主所有发布的视频，适用于备份视频的场景。
eVSIF-MB
Someone and I were planning to collaborate on the production of eVSIF, which was positioned as an upgraded version of VSIF and supported 15 expansion card slots
MAmi-VSIF-for-MSX-MD
The open source hardware implementation of the VSIF standard can be completed using the red FT232 module that can be easily purchased on Alex. No complicated welding is required. The current hardware supports both MSX and MD devices.
Minimal-UART-CPU-System
Legacy: TTL-only CPU featuring UART I/O, an expansion port, 512KB SSD at up to 10MHz clock speed
MiniMax-4-bit-CPU
An improved version of the classic 4-bit TD4-CPU. It uses less than 20 logic gate chips to build the world's simplest yet Turing-complete CPU.
modizer
iOS chiptune/module player
My4TH-light
My4TH light is the big brother of the My4TH XS computer board. In contrast to the My4TH XS it has an I2C interface that is 8 times faster than the I2C interface of the original My4TH board.
OFG245
I discovered this project when someone and I were preparing to collaborate on eVSIF. Then we found that OFG245 was very similar to eVSIF, but for some nonsensical reason, the cooperation was unilaterally terminated by someone. So I uploaded OFG245 to commemorate our previous cooperation. The copyright of the original design belongs to Ofugao.
RE2-YMF262
Functionally verified RE: Birth 2nd sound card. This project refers to the design of RE2-YM2151 and RE2-YM2608. In fact, the audio circuits of OPM, OPNA, and OPL3 (Yamaha dedicated DAC YM3012/3016/YAC512) are exactly the same.
The-Minimal-64-Home-Computer
Legacy: Full TTL-only home computer with VGA and PS/2 and twice the processing power of a Commodore 64
u2-SX-Mini_IO-Board
u2-SX-Mini_IO-Board is an IO expansion board for FPGA EP4CE15F23, fully compatible with the SM-X HB standard second-generation OCM hardware.