Recently I decided to dust off my old ZX81, the very machine that I learned programming on some 30+ years ago. It’s getting kind of difficult to find a TV that works with it, especially as I have the 1st ULA version that didn’t do the sync signals correctly. So I decided to “invest” (it’s… Read More »
The QL and its non-standard video interface has always been a problem, even more so since the introduction of LCD monitors. Since I got my QL out of storage a few years ago I’ve been looking for a solution. I bought all kinds of Chinese video converters, the GBS8220 for example produced a very unstable… Read More »
When importing a project into Quartus 18.1 it helpfully suggests that it can rebuild the PLL IP blocks. Problem is, afterwards the MegaWizard doesn’t want to recognise the blocks anymore. It doesn’t even show an error, it just doesn’t do anything. As somebody who has never even used a MegaWizard before that was somewhat unfortunate.… Read More »
Prompted by a customer request I have extended my QL-SD demo file with a few free QL games, 20 in total, including some that were never available for free before but for which I have the rights to release (basically the Jochen Merz catalog, thanks Jochen!). I went to great length to try to make… Read More »
I have released the QJump versions of QMON here.
I’ve released a new version of Minerva, get it here.
Martyn Hill, while testing his brand new Tetroid SuperGoldCard clone, has discovered a strange bug where his QL crashed when he was loading a _scr file into the QL’s screen memory. It works fine without the SuperGoldCard. A lot of theories were put forward, like: It’s a problem with the SuperGoldCard: turns out it works… Read More »
The last few days I’ve spent way too much time analyzing the (Super)GoldCard boot ROM. The sources supplied along with SMSQ/E are only sparsely commented disassembly that was basically impossible to read. It irked me to no end that I didn’t understand the code and finally I did something about it. The process had a… Read More »
The QL-SD driver seems to be finished (note that it currently doesn’t work with the MiST FPGA board, but there are no more known problems with either the original QL hardware or the MiSTer FPGA machine). Now the boring part has begun, which means hours of reading tax related stuff (selling stuff internationally is hard!),… Read More »
Update: the old code had a bug if the EXE was made resident using the HOT_RES keyword (thanks to Jan Bredenbeek for pointing it out), updated code below. Today I’ve had a short discussion about creating a QDOS executable that can both be LRESPRed (to install a thing) and EXecuted (to, erm, execute it). One important… Read More »