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MSX1 keyboard matrix

by Shinobi on 31-07-2020, 03:09
Score: 165 %, Type: Forum topic , Comments: 10 comments
rewritten the interrupt routine, you can simply read the system variables at 0FBE5h-0FBEFh. In basic? ... haven't rewritten the interrupt routine, you can simply read the system variables at 0FBE5h-0 ... keyboard socket pin Y0 and took a line from keyboard socket pin X0.... Now with arduino i am checking ...

S2357 clock out

by Shinobi on 21-07-2020, 05:42
Score: 164.94 %, Type: Forum topic , Comments: 6 comments
Hi.. I found that clock in in my s2357 msx engine chip in an msx ax200 is 3.5MHz Then by checking the clock out pin whicj is the pin that goes to cpu clock pin, it sometimes reads in hertz and sometimes in KHz and sometimes it reads 3.5MHz and the ...

ps/2 keyboard to msx

by Shinobi on 19-07-2020, 12:42
Score: 164.93 %, Type: Forum topic , Comments: 7 comments
that means every time a key is pressed PPI will feed current to the cartridge adapter that will force a 0 on a line PPI is outputting 1,if it just drain enough current to have voltage level detected as logical 0 ...

My MSX AX-200 worked, BUT ..

by Shinobi on 18-07-2020, 02:47
Score: 164.69 %, Type: Forum topic , Comments: 0 comments
After fixing a short in RAM cart connection and after knowing that (Clock Out) from MSX Engine S3527 is not always working, my MSX AX-200 worked When connecting the keyboard, some keys won't work, I see, I can open the keyboard and clean it from ...

RAM Cart Socket

by Shinobi on 15-07-2020, 03:27
Score: 164.75 %, Type: Forum topic , Comments: 3 comments
http://rbsc.su/en/other_projects/#0106_Upgrade_Yamaha_Standa... (Hardware) ...

MSX AX-200 - Black video output

by Shinobi on 06-07-2020, 00:42
Score: 164.64 %, Type: Forum topic , Comments: 8 comments
for example A4 of Z80, if it changes, from 5 to 2 for example then to 0 then to 5 , means it's working. ... some of them are 5V, others are 0V even after repeating checking that for more than 5 minutes. The Z80 ...
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