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+## Kharon-386
+10x10cm 386SX PC with integrated VGA and sound.
+
+[![photo](images/revA.small.webp)](images/revA.webp?raw=true)
+
+[![photo](images/revA-side.small.webp)](images/revA-side.webp?raw=true)
+
+### Tech specs
+* 386SX40 CPU and M1217B chipset integrated into one M6117D chip
+* 4MB RAM
+* TVGA9000i-based VGA video card
+* ES1868F-based SBPro-compatible sound card
+* SAM2695 MIDI synthesizer
+* ESP8266 WiFi module
+* PS/2 keyboard and mouse inputs
+* 2xCOM ports
+* CF card slot
+* Real-time clock (RTC) with backup battery
+* Integrated PC-speaker
+* 5.1V microUSB power
+* Two 4-layer 10x10cm PCBs optimized for G738 and G706 cases
+
+### WiFi module
+There is two options how to use WiFi module:
+1. Zimodem ([link](https://github.com/bozimmerman/Zimodem)) - provides ability to connect to BBS via any terminal without using additional software.
+2. esp_slip_router ([link](https://github.com/martin-ger/esp_slip_router)) - provides ability to connect your machine to IP network just like as Ethernet. You need ETHERSLIP or similar packet driver for DOS.
+
+To upload firmware you need USB-UART adapter with 3.3V signal levels. Connect GND, RX and TX lines to esp header located on main PCB at left, install BOOT/GND jumper and follow any ESP8266 firmware update guide that is available on the internet.
+
+### Sound mixer
+MIDI synthesizer is connected to the AUXB sound input of ES1868F. Usually this input named as "CD input" in mixer software.
+PC speaker is connected to the AUXA input.
+
+### Assembling
+TODO: link to video how to assemble everything
+
+### CF card image
+TODO: upload preconfigured CF card image
+
+### Changelog & current status
+Main PCB:
+* Rev.A - first release. Please note the [errata](pcb_main/rev.A/ERRATA.txt)
+* Rev.A1 - fixed all rev.A issues; added switch for BIOS variant select; added optional -5V source. This revision hasn't been tested.
+
+Top PCB:
+* Rev.A - first release. Please note the [errata](pcb_top/rev.A/ERRATA.txt);
+* Rev.A1 - fixed all rev.A issues; added switch for VGA BIOS variant select; removed VGA-disable switch. This revision hasn't been tested.