Fixing the white screen problem on a Tekway DST1062B oscilloscope

The Tekway DST 1062B (also known unter the Hantek or Voltcraft brand) is an inexpensive 60MHz digital storage oscilloscope, which is very much hackable and has proven to be worth its weight in gold pressed latinum. More recently, my scope became affected by the infamous white screen problem, which apparently is a problem quite common to this model and its 100MHz or 200MHz siblings. The Tekway/Hantek white screen of death
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V9958+OPL2-Boards are there

The newly made boards made their way from China to Munich. Starting now, the multi board version of the Steckschwein is made up of 3 Boards: CPU/Memory, IO/UART and V9958-OPL2.
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New V9958-Board with integrated OPL2

It’s time for another hardware upgrade. Since we really want to get our single board Steckschwein done, we are going for higher integration of our multiboard prototype. After integrating the UART to the IO-Board, we integrate the OPL2 sound part onto the V9958 video board, so the current Steckschwein multi board incarnations are reduced to three boards. We did postpone our plan to upgrade sound to OPL3 because Daniel Illgen, which we met at VCFb, convinced us with some awesome OPL2 tunes that OPL2 is still cool.
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V9958 - “The WAIT” - investigation of the CPU/VDP /WAIT interface

… on the way back to munich, we had some time to do a little code review of our gfx library. thinking about the cpu to video chip timings and again read the well known datasheets of the V9938/V9958. suddenly i got an enlightenment and we came to the following conclusion. as described in the datasheet (V9958-Technical-manual_v1.0.pdf) of the V9958 there are different timings given for different kind of writes. so as far as we understand there are the following timings
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VCFB 2018 It was great…

VCF 2018 in Berlin was great! We’ve met interesting people there. Got a handshake with Scot W. Stevenson who for(th)ced us to use his TaliForth2 ;) Later on Saturday Daniel Illgen - maintainer of the Adlib Tracker II for Linux - had decided to honor us with his OPL2 knowledge while on the way out. He advised us to keep the OPL2 sound chip on the Steckschwein, because the OPL2 chip is still not outbid.
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