Ports and Connectors
Contents
Front Panel
RCA Line In
These are standard RCA Line-In jacks, 2v P-P nominal.
Headphone Jack
Standard 1/8" stereo headphone jack.
SD Card
Standard SD Card slot using custom controller logic instantiated on an FPGA.
Joystick Ports
The joystick ports, from left to right, are numbered 1,2,3,4.
- Ports 1 and 2 may be electrically configured as 12 bit (S)NES style ports or as TTL ports.
- Ports 2 and 4 are ATARI/C64 style ports and include analog inputs.
| DB9 | 1&2 (S)NES | 1&2 TTL | 3&4 ATARI/C64 |
| 1 | ignored | UP | UP |
| 2 | ignored | DOWN | DOWN |
| 3 | ignored | LEFT | LEFT |
| 4 | ignored | RIGHT | RIGHT |
| 5 | LATCH | Button 1 | POT-Y |
| 6 | DATA | Button 0 | BUTTON |
| 7 | +5 | +5 | +5 |
| 8 | GND | GND | GND |
| 9 | CLK | Button 2 | POT-X |
Reset Switch
"Power" LED
The power LED is under software control.
Rear Panel
Power Switch
Just an ordinary rocker switch.
Power
The power connector is a 12v center-positive 2.5mm barrel connector. The bare board should operate on as little as 500ma, but you should plan on more like 3A to cover adding a floppy drive, hard drive, etc.
PS/2 Keyboard and Mouse
PS/2 port 0 (Purple) -- nominal keyboard port PS/2 port 1 (Green) -- nominal mouse port
DVI-I
The Video connector is DVI with digital and analog output suitable for use with passive VGA and HDMI adaptors.
Parallel Port
IBM Standard DB25 EPP
Serial Port
IBM Standard DB9 RS232; all pins implemented.
MIDI
The port on the left (closest to the serial port) is MIDI OUT. The port on the right (closest to the RCA jacks) is MIDI IN.
Line Out
These are standard RCA Line-Out jacks, 2v P-P nominal.
Internal
J2 (Serial)
The 8-pin serial header follows the DTK/INTEL standard:
- https://pinoutguide.com/Motherboard/rs232_header_pinout.shtml
- https://wiki.c256foenix.com/index.php?title=File:FMX_internal_serial_Header.jpg
P2 (IDE)
Standard 44 Pin 2.5" laptop HDD IDC header.
J-TAG
Standard 10-pin J-TAG connector for reprogramming the FPGAs.
FLOPPY0 and FLOPPY1
FLOPPY0 and FLOPPY1 are electrically standard 3.5 inch micro Floppy Disk Drive connectors (26 pin flexfoil).
- The internal drive is expected to be connected to FLOPPY0.
CN1
J-TAG interface for programming the TRINITY and UNITY FPGAs.
