From 091dd18658a7596b34633f085957d19b1f6a35d6 Mon Sep 17 00:00:00 2001 From: Nigel Kendrick Date: Mon, 21 Oct 2019 06:57:17 +0100 Subject: [PATCH] Update README.md --- README.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/README.md b/README.md index e97e650..3424af7 100644 --- a/README.md +++ b/README.md @@ -1,5 +1,7 @@ # Multicomper +**This is a hobby project and comes with no official support. The PCB schematic and board design files are offered 'as is' with no claims made about their fitness for any specific purpose.** + A motherboard for the EP2C5T144C8N Cyclone II dev board and 'Multicomp'-based FPGA computers with Z80, 6502 and 6809 soft cores. The Multicomper motherboard is a simple platform for creating a UK101 functional or 'Multicomp' computer based on the design work of Grant Searle: @@ -54,6 +56,10 @@ The Multicomper’s 5V regulator is fed via the 2-pin header from the dev board Grant’s VHDL code does not support SDHC micro-SD cards, so if you want to use one for your Multicomper build (i.e.: You want to run more than the basic UK101 configuration), you should replace the *sd_controller.vhd* file in the Multicomp project's sub-folder *Components/SDCARD* with the one from the following project: https://www.retrobrewcomputers.org/doku.php?id=builderpages:rhkoolstar:mc-2g-1024. To do this, download and unzip the ZIP file on the above page, then locate and copy the file mentioned. +**Keyboard** + +As per the original Multicomp designs by Grant, the keyboard is powered from the FPGA's 3.3V supply rather than the normal PC standard of 5V. This works fine with many - but not all - keyboards, including USB ones with a PS/2 adapter. + **Designs** The following FPGA designs have been tested on the Multicomper: