Sinclair ZX80 / ZX81 / Z88 Forums

There might be a timing problem, which occurs using modern and fast ram chips. See there: https://www.sinclairzxworld.com/viewtopic.php?p=2620#p2620 " The problem is the old design of the ZX80/81, where the internal RAM's output drivers are enabled together with the complete chip ( /CE conneted to /...

FYI: old feature request for Z88DK about this topic: https://www.z88dk.org/forum/viewtopic.php?id=4877 old thread about this topic: https://www.sinclairzxworld.com/viewtopic.php?p=31046#p31046 BTW: in my ZX81-MIDI-Player I am using the ZX81 NMI interrupt generator to make the MIDI clock. Of course t...

Using BASIC and machine code, Wilf's NOVA allows to call "short" or "long" machine code routines during display. Docs are here (switch to character set "western" for correct display). http://www.user.dccnet.com/wrigter/index_files/nova2005.htm Siggi PS: The "machine code" could also be a compiled C ...

Let me explain. By using IM2 and having no device to put the right byte you may jump to anywhere in a page because it will read a fake byte on the data bus. The ZX81 has 10K pullup resistors connected to the data bus. Thus if no device drives the data bus during interrupt acknowledge cycle, the Z80...

Yes, the size seems to be the same. Distance between the "Europa hole" and the visible frame of the American hole is 13 mm, the distance to the EAR hole is 6 mm.
Siggi

The position of the American version TV socket is a little bit visible at the European case version (see pic).
So maybe the European socket is also visible on the Amercian case?

Siggi

There are 2 variants of the the case for 2 different locations of the TV connector: in Europe the connector is closer the the MIC/EAR/POWER sockets than in America:

Hi Stefano this is a picture on a good LCD colour monitor, generated by a ZX81NU (no ULA), having a BIGBANG-ROM. The pixels seem to be identical, so maybe the rom region, which is used as "character generator" by your program, is not modified compared to the original Sinclair rom. The picture ist st...

Meanwhile Joachim has updated the software of the LCD display: now it supports also German special characters (e. g. used by Nena )
And I have modified the midiplayer for better readability of the Karaoke text:

Did you think about confessing a voice synthesizer to sing? Indeed: https://forum.tlienhard.com/phpBB3/viewtopic.php?p=42838#p42838 :mrgreen: But that would require a conversion of text into vocals at realtime (between 2 MIDI-events) AND an AI to detect the language ... :mrgreen: @Moggy: here it is...