Search found 233 matches

by stephen_usher
Sat Jul 11, 2020 5:47 pm
Forum: Help for New Users
Topic: Peeking/Poking pixels directly
Replies: 3
Views: 84

Re: Peeking/Poking pixels directly

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...
by stephen_usher
Sat Jul 11, 2020 5:24 pm
Forum: Hardware
Topic: vDrive: With MDV sound? I wonder.
Replies: 9
Views: 393

Re: vDrive: With MDV sound? I wonder.

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...
by stephen_usher
Sat Jul 04, 2020 10:00 pm
Forum: General QL Chat
Topic: ST Basic - inspired by QDOS?
Replies: 2
Views: 146

Re: ST Basic - inspired by QDOS?

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.
by stephen_usher
Wed Jul 01, 2020 12:05 am
Forum: Hardware
Topic: vDrive: With MDV sound? I wonder.
Replies: 9
Views: 393

Re: vDrive: With MDV sound? I wonder.

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.

IMG_1938.jpg

IMG_1940.jpg
by stephen_usher
Wed Jul 01, 2020 12:00 am
Forum: Hardware
Topic: QL-SD
Replies: 41
Views: 1301

Re: QL-SD

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...
by stephen_usher
Tue Jun 30, 2020 1:45 pm
Forum: Hardware
Topic: QL-SD
Replies: 41
Views: 1301

Re: QL-SD

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...
by stephen_usher
Tue Jun 30, 2020 1:42 pm
Forum: Hardware
Topic: QL-SD
Replies: 41
Views: 1301

Re: QL-SD

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 ...
by stephen_usher
Mon Jun 29, 2020 11:27 am
Forum: Hardware
Topic: QL-SD
Replies: 41
Views: 1301

Re: QL-SD

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 ...
by stephen_usher
Sat Jun 27, 2020 8:16 pm
Forum: Hardware
Topic: vDrive: With MDV sound? I wonder.
Replies: 9
Views: 393

Re: vDrive: With MDV sound? I wonder.

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/
by stephen_usher
Sat Jun 27, 2020 5:32 pm
Forum: Hardware
Topic: vDrive: With MDV sound? I wonder.
Replies: 9
Views: 393

Re: vDrive: With MDV sound? I wonder.

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...