Content:

Assemble your Mini-ITX Ironclad Plus:

This operation must be done in a well illuminated room so you can be sure each pin of every connector goes where it sould.

Needed tools: None

STEP 1 – Check the temperature sensor in your Ironclad, during transport it has probably been bent down and is laying on the board. It should have its head slightly higher than the metal standoffs and be bent to the left to be aproximately over the circle mark painted on the board. This is to ensure proper contact with the DE10-Nano to have correct temperature readings.

STEP 2 – Remove all screws and stand-offs from your DE10-Nano fpga board, it must be completely naked, except for the SDRAM module if you are going to use it, if it is not already mounted, mount it now.

STEP 3 – Insert first the Ethernet and Micro-USB bridges to the corresponding DE10-Nano ports.

STEP 4 – Put the DE10 over the stand-offs on the Ironclad in the correct orientation and connect both bridges to the ironclad while inserted into the DE10 by pressing gently from the top of the Ethernet and Micro-USB ports themselves using two fingers at the same time, not by pressing anywhere else on the DE10 board, this is to ensure the Micro-USB connector does not suffer any stress as it is the weak spot here.

STEP 5 – Connect the rest of the bridges; the RTC, the GPIO, and the ADC in their corresponding places by inserting them from top to bottom. As the female connectors are on the Ironclad and the bridges are males, you can very easily see from the top when the pins are going to the correct places, please pay special attention to this.

STEP 6 – Screw the DE10-Nano to the Ironclad’s four stand-offs using the original screws, or stand-offs, that came with your DE10-Nano, you can also use standard small floppy/hdd/ssd computer screws.

STEP 7 – Connect the supplied ribbon cable as shown in the pictures, over your SDRAM module, paying attention to connect it to the correct pins on the DE10-Nano. Gently insert both ends to the end.

And that’s it!, it took less than 2 minutes, now the whole “block” installs in your case as you would do with any standard Mini-ITX PC motherboard.

Some really small cases force you to introduce the motherboard at an angle to fit, in those cases you might need to unscrew the Ironclad’s backplate, put the backplate into the case from the inside, and insert the Ironclad at the required angle while holding the backplate in place with your hand from the outside.

The backplate is easily removed by unscrewing the two screws from the VGA out and the two on the DB9 User Port. When putting it back make sure all i/o connectors are correctly aligned with their holes before tightening the screws.

Board Layout and Internal Connectors:

Front Panel Header:

PLED: Connect your case’s “power led” in this two pins. Positive lead is the left one, sometimes it is hard to identify the polarity looking at the cable, if it does not light up, is the other way around.

PWR: Power switch cable from your case goes here, polarity does not matter.

HLED: Connect your case’s “HDD activity led” in this two pins. Positive lead is the left one, if you nailed the PLED, this time there is more probability of failing ;p

RST: Reset switch cable from your case. Many modern cases do not have this, don’t worry if that’s the case, Reset function can also be accessed from the “power” button.

ULED: User led output, you can directly connect here an LED which would make the function of the “Official MiSTer USR LED”. It does not have any other purpose.

PLED_ALT: If you are using your Mini-ITX Ironclad without the GPIO1 bridge, in order to use dual SDRAM modules for example, connect your case’s “power led” to this two pins instead of the main PLED pins. This time positive lead is the right one

Fan Headers and Fan Control Modes:

The Mini-ITX Ironclad Plus has three fan headers, the one labeled “Fan3 5v” is designed to always output 5 volts. It is useful if you want to use a 5 volts fan, or a 12 volts fan at reduced speed. You can connect 2 or 3 pins fans here. The speed of this fan cannot be controlled. You can also use this header to connect a 5 volts accessory, leds, or whatever you want.

The other two fan headers labeled as Fan1 and Fan2 allow automatic or manual control of the speed. In order to use this functionality the fans must have a 4 pins connector, 2 or 3 pins fans will not be controllable. This header can also be used to plug LED strips or other 12 volts accessories you like… and your PSU can manage.

Controlling PWM fans: The button on the board labeled as “Fans Speed” is in charge of controlling how the fans work, by default your Ironclad Plus comes configured in “Automatic” mode. In this mode the Ironclad tries to keep your FPGA temperature below 60ºC while doing as low noise as posible, if for some reason you are not satisfied with how this performs in your personal setup you can use the “Fans Speed” button to set the fans fixed at your desired speed. It works as follows:

Every time you click that button fan speed cycles between 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% ,100% and then goes back to 20% and so on. 20% is the minimum the PWM fans standard guarantees to work fine.

To return to “Automatic” mode, press the “Fans Speed” button for 2 seconds, you will hear a double confirmation beep coming from the speaker and the fans go to this mode. If you press the button one more time, the fans return to manual mode with the speed you had previously configured while in this mode. Your manual fans speed and/or automatic mode configuration is saved to memory so the setting is never lost even if you completely unplug your Mini-ITX Ironclad plus.

Measures and Choosing a Case:

The Mini-ITX Ironclad Plus has a standard Mini-ITX form factor, which is 17x17cm (LxW), and 4.8 cm height with the I/O backplate in place, this means it will fit in any standard Mini-ITX case. There are some cases labeled as Mini-ITX which has a height inferior to 5 cm, this cases are badly labeled, as they are Slim Mini-ITX form factor instead and the Ironclad Plus will not fit, so make sure the case you choose has >5.5 cm height. It might be possible to make it fit in one of those “slim” cases, but you will not be able to use the included backplate and/or some modding might be needed, but that is up to you 😉

The Power Supply:

Some cases come with their own power supply or can be bundled with it, that’s the easiest way, but if the one you really like the most does not come with one, don’t despair, ATX power supplies are very common and inexpensive this days, specially when you need a low power one.

The Mini-ITX Ironclad Plus is compatible with PSUs that comply with the ATX standard that use the 20-pin or 24-pins connector, so almost any would do, but there are some minimum requirements to keep in mind.

A fully assembled Mini-ITX Ironclad Plus only pulls about 9 Watts from the wall while running heavy MiSTer FPGA cores, that’s a very low power consumption compared with ATX power supplies everywhere providing 160+Watts!, Ok, that’s true, but the usual DE10-nano power requirements still apply here and it needs a PSU capable of providing about 2 amps from the 5 volts line, just like the PSU that came with it, or even more Amps if you are going to use high power consumption USB devices, like big mechanical hard disks for example.

Fortunately that 2 amps are a piece of cake for most ATX power supplies, for example, the typical 80 W Pico-PSU provides 6 Amps at its 5 volts output:

picoPSU-80 DC/DC PC ATX power supply (Fanless, 80 Watt)  [ PicoPSU ] (cartft.com)

So it is pretty easy to choose a PSU for your Ironclad Plus, if you can see its full specs go to the 5v output and check how many Amps it can provide, if not, just pick one in the range of 120-160 Watts which is plenty of juice and i have never seen one which does not greatly exceeds the 2 Amps from the 5 volts outputs.

TIP: This power supplies usually come with additional connectors, like 4 pin molex for hard disks and floppys, sata power connectors, 4 pin CPU connector, etc. Those connectors have no use in your MiSTer Mini-ITX Ironclad setup, if you know you are not going to use that PSU for other setup in the future, you can just cut them out from their wire’s base while it’s completely unplugged from the wall to make your build cleaner.

The power “brick”: This small PSUs usually come with an external 12v power “brick”, if that is your case, just use that, if you have to purchase one or have one of them at home, 12 volts with 2 Amps at the output is more than enough for your MiSTer setup.

Operating your Mini-ITX Ironclad:

Congratulations!, now you have your MiSTer setup of your dreams assembled, now it’s time to know how to operate it ;). The Ironclad has built in buttons for “Menu (OSD)”, “Reset”, and “USR” functions on the PCB, but they are only there for testing, or use in some special cases as you can trigger their functions using just the power button of your case as follows:

  • When the Ironclad is OFF, press it to power ON your MiSTer
  • When the Ironclad is ON, press it briefly to trigger the “Menu (OSD)” function, do a double click to trigger the “Reset” function, or do a triple click to send the “User (USR)” command to your MiSTer. Reset and USR triggering method can be swapped, see “configuration” section below.
  • To turn off your MiSTer press and hold the power button for two seconds.

If your case happens to have a Reset button, and you connected it, you can use it to directly trigger a “Reset” command with a single press, or completely power cycle your MiSTer by pressing and holding the button for 2 seconds.

Remote Control and Remote Learning Feature:

Connect your receiver to the Ironclad using this picture as a reference:

Recently the header for the IR receiver has been moved to the front panel header, next to the “RST” pins, same principles apply, check the small onboard diagram to know the correct receiver orientation.

Use the supplied 20 cm extension cable to mount the receiver wherever you like in your case. Cut the legs and bend them backwards if necessary to make it fit in tiny spots. Drill a small 4 mm hole, and fix the receiver from the inside with hot glue or any non-conductive sticky stuff.

WARNING!!: This receivers are pretty sensitive to reverse voltage and they will kill themselves immediately if that happens by mixing pin connections or if the metal housing touches any other signal different than “ground”, it can touch the chassis of the case though, so pay extra attention to connect it following the correct pin correspondence and don’t let it dangling around inside the case. If it breaks you can purchase a replacement from Amazon or your local electronics shop, they are very common and inexpensive. The model number is VS1838B, any 1838 will work, but make sure it has the metal shielded “head”.

Remote Learning procedure: With the Ironclad in “standby” mode (with red led) press and hold the “fans speed” button on the PCB for 2 seconds and release it, you will hear a beep, point your remote to the receiver and press the button you want to function as power on/off, if the code is recognized you will hear two beeps, then press the button you want to be “Reset”, if OK you will hear three beeps, then the button you want to be “Menu (OSD)”, you will hear four beeps, and finally press the button you want to be saved as “USR” command, you will hear a “melody” and the commands are saved. If you have the Internal MT32-Pi hat connected using the onboard “Pi-CONN” header, two additional remote commands are requested to learn after the USR command, they are “rom” and “synth” for the MT32-pi, then the final melody will be heard.

If you are in the middle of the learning process and no valid remote control command is received during 20 seconds or you press the case power button, the learning process is cancelled and an “error tone” is played. No changes are made to the previously saved remote commands when the process is timed-out or cancelled.

Configuration Options:

By default “Reset” function is triggered with a double click of the case power button, and “USR” command is triggered with a triple click. In some situations you would want it to be the oposite way, for example; if your case has a dedicated reset button, if you are used to never use the reset command at all to go back to the main MiSTer menu, or if you happen to trigger some undesired resets while trying to perform a “USR” command. To change this behavior and have “USR” with a double click and “reset” with a triple click instead, do three clicks in the “fans speed” button on the PCB while the Ironclad is ON (green led), you will hear an acknowledge tone and the setting is saved. Do it again if you want to change that around again.

NEW! Silent mode: This feature is only available on current board models with the buzzer soldered on board, click on the “Fans control/Config” button 5 times to toggle “Silent mode” no matter if it is on or off. In this mode beeps on powering on, off, and reset will not be heard until you manually toggle again this mode. There is also a temporary “silent mode”; if you turn on your Ironclad Plus with a long press of the case power button it enters temporarily into this silent mode and no beeps will be heard for that session, once you turn it back off it returns to standard beeping operation.

NEW! Cabinet power mode: In this mode your Ironclad Plus will turn on as soon as it receives power, which is ideal for operation inside an arcade cabinet without needing to modify or hack your power supply. This function is only available in recently manufactured boards. To toggle this mode click on the “Fans control/Config” button 7 times while the Ironclad Plus is ON (green led).

Factory Reset: With the Ironclad in standby mode (red led), click 10 times on the “fans speed” button on the PCB. This resets all configurations to factory defaults, which are; fans speed / mode, remote control codes, button commands, and everything. This might be useful for troubleshooting, or if you lose a remote you had saved, and want to return to the default factory remote control buttons.

Disable all thermal capabilities: With the Ironclad in standby mode (red led), click 14 times on the “fans speed” button on the PCB. This feature is something one normally shouldn’t use, but in case the thermal sensor on the board gets ripped apart, or your cat eats it, you can use this command to disable every function relying on it. In this mode the Ironclad will not enable the automatic fan control, will not warn you when it reaches certain temperatures and will not turn itself off when it thinks the temperature reach 80 degrees C. This option is saved and can only be reverted if you do the command again or do a factory reset.

The “Audio-Exp” header, how to connect your I2S Audio DAC:

Thanks to the modular design of the Ironclad Plus any I2S Audio DAC can be used to improve the audio quality of all analog audio outputs at once, no modding to the board is required, just connecting the module following this diagram:

To do that, for example, you can solder a pin header to the I2S DAC module of your choice and use dupont cables to interconnect the pins to the “Audio-Exp” header, don’t forget bridging the two pins in the diagram. Beside connecting the module, you also need to flip the “SW0” switch on your DE10-Nano to enable I2S audio, it is the rightmost switch.

To be Continued…