Under QDOS the first screen starts at $20000 always. Seeing as Sinclair used part of the second screen memory for system variables it's highly unlikely to be used. In mode 4 you effectively have contiguous "raster" lines with pairs of bytes containing a bitmap of 8 pixels, the first byte i...

Yes, as it's merely a WAV file which has been converted into a C array of unsigned byte values which is then sent to the chips digital to analogue converter. The sample can't be very long though as the chip only has a small memory for the program. i.e. // Audio encoded as unsigned 8-bit, 8kHz sampli...

It's a pity that the BASIC itself is so basic and if they did learn anything then it wasn't how to write a good language.

I've built the first version of the sound unit today and it does actually work.

The card itself fits nicely under the SD card holder.

This is going to cause me to change my vote to a single full-SD card as it allows you to have your QL connected wirelessly to a PC. You don't *HAVE* to have a large SD card connector to do this. Merely use and extension cable, which may give you better WiFi signal anyway: https://www.amazon.co.uk/E...

I'm have been experimenting with SDIO cards like the Toshiba FlashAir for some time now, giving QL-SD access to WLAN and peer-to-peer networking - Those can generally be had as large-size cards only, so must be kept in mind as well. Tobias (Off-topic) So, you can hijack the LAN interface and use th...

Hi, I have changed my vote, after a little thought, I think with ful size SDHC cards would be better. As stated above this gives compatibility with other QL based systems, like the Q68 which has 2 SDHC Slots, PC with QPC2/ SMSQmulator. Also all my PCs and laptop have full size SD Slots. So my vote ...

I'd like to be able to swap the card between QLs easily without having to disassemble, so either 1 or 2 is fine for me. 2 would be useful if you want to do back-ups or duplicate to give to others, so it would probably be preferable. What components on there are non-SMD? Just the headers? What could ...

Here are the schematics for the vDrive sampled sound board plus source code and compiled HEX file to load onto the ATTiny85 20U.

http://www.lingula.org.uk/~steve/share/vdrive-sound/

Actually I think I'm there, other than making a PCB and soldering the components. I've created a new and better sample, with a higher volume and cutting out some of the peaks and then set the ATTiny85 to play at double the speed it was previously, which was already a factor of 4 faster than the samp...