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Updated README for the HDMI version

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boards/ulx3s/README.md
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# Ulx3s with Digilent VGA Pmod
# Ulx3s with HDMI
This adds support for building the apple one design for [Ulx3s](https://radiona.org/ulx3s/) with attached Digilent Pmod for vga and a ps2 keyboard connected to the us2 usb connector.
This adds support for building the Apple One design for [Ulx3s](https://radiona.org/ulx3s/) with HDMI output and a PS/2 keyboard connected to the us2 USB connector.
## Peripheral support
VGA port is working through a Digilent VGA Pmod on the J2 double Pmod
HDMI output on the built-in HDMI connector
PS/2 keyboard is connected to the us2 USB connector
PS/2 keyboard is connected to the us2 USB connector.
Note that some USB keyboards drup down to PS/2 mode and will work.
## Building
Install a recent Ecp5 open source toolchain, and:
Install a recent ECP5 open source toolchain, and do:
```
$ cd yosys
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## Use
To load BASIC type "E000R" with CAPS LOCK on.
To load BASIC type "E000R" (with CAPS LOCK on if you are using the UART rather than the PS/2 keyboard).