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The other possibility is that it is for the extra user port on the colour card. If you start this with *ARTIST you just get a prompt to put the nib down in the left corner for alignment and the beeb just hangs waiting for a response.

Emulator enhancer mac serial number serial#

PA1 and PP1 - I think this set is for the serial port version of the tablet There are two sets of ROMs but I can't really test them as I don't have a graphics tablet: Shame this wasn't more widely known about at the time as it's a lovely bit of kit and a great way of improving the Beeb's video output. It's programmed via a small machine code subroutine loaded at &C00 using CALL &C00, C, R, G, B where C=1-7, R, G & B = 0-15. Resistor ladder DACs convert the RAM outputs to analogue levels and there's a pass-thru switch so that the display can be seen before the RAMs have been programmed. It's controlled by the user port and has three 16 x 4-bit RAMs to hold the extended palette. It's very similar in design to Mike Cook's Chameleon but is much earlier as it dates from 1982 rather than 1990. Here's a short clip of it in action running some of the demo software that Phil has preserved:

It allows physical colours 1-7 to be redefined to any from the 4096-colour analogue palette.

Unfortunately, we didn't get it working at the time (because I confused the input socket with the output!) but I've since taken another look at it and it's now up and running. Phil kindly brought this along to the Leicester ABUG for me to look at as it's kind of an ancestor to my VideoNuLA.