If you are interested in retro computing, especially Sinclair ZX Spectrum computing, I highly recommend Paul Jenkinson The Spectrum Show if you haven’t found it yet. It is very well made series with a nice structure: news of that era, software comparison, game reviews, new software reviews etc. Highly recommend.
As recently I started tinkering with ZX Spectrum hardware, tested one old joystick I had. Up and right positions did not work during the games. Tested port reading with one simple program: 10 LET x=IN 3120 PRINT X30 GOTO 10 There was no reading in up and right position.I took apart joystick case and tested […]
So, this ZX spectrum was alive, but during testing with some games (for example game “Breakthrough”), I noticed strange video glitch in upper screen part: My guess was it is not video RAM related, but probably RF module fault. First decided to change all electrolytic caps on the board and see if it helps – […]
Maybe I got carried away.. but here is another non working rubber keyboard ZX Spectrum I got (s/n D01-257600). Its interesting regarding those serial numbers, some are 01 some D01. I really would like to know what do they mean, if they mean anything ? Found one site that has list of some serial numbers […]
Another was ZX Spectrum+ 48K (s/n S01-135100). After turning it on could not see clear image (sorry did not take image of that picture). When I disassembled this device I found that it already had some changes, lower RAM chips were not original, it had some jumper wires soldered on PCB, transistor TR4 seemed like already replaced (at […]
Going back into retro computing. Recently got little bit nostalgic and purchased two used non working ZX Spectrum machines. One was 16K, SN 001-201230. Tested some voltages using this guide and it seemed like everything is more ore less normal. Plugged it to TV antenna, tuned to channel 35, turned it on and as expected it […]