I love that ROM Disassembly book, I learnt so much from it back in the day - including how to write tape load/save code, which later allowed me to port code to the Amstrad CPC. So well documented and useful, additionally showing how great the Sinclair coders were to get what they did out of this machine.
Tip for getting that glue off - spray WD40 on it... leave it for a few minutes.. then it scrapes away super easy. Only downside is your room will stink of WD40 afterward!
I loved my spectrum 48 in those days. I live in Holland and ordered it in England. Also my later bought double 3,5" diskette drive (blue, cannot remember the name) came from England. I used it for wordprocessing of our club periodical and the standings of the club championship motocross. I loved using machine code and succeeded in sorting arrays by swichting pointers. Who knows the diskdrive brand?
You can always read the memory locations associated with ROM and RAM as long as the commands exist. Decoding then just depends on the opcode table of the CPU you're working with
cool, this is my computer, the display has more noise on it than before, I'm using an upscaler thing so I can use it in a modern TV that doesn't have composite, and I've lost the little adapter thing years ago. the faceplate was battered, and wasn't staying down, I've ordered a new one from evil bay in chrome. the thing works. alas my hand now spans the whole keyboard so no games played using "Q, A, O, P and Space to fire" Now to fix my DivMMC as it's corrupted the SD card.
Hi, I got number 7 upper ram chip out. I`ve noticed pin 11 has a link to the other pin 11`s on the other chips. But under chip 7 the link is only going half way across. Either I broke it or it is the fault. It`s hard work with old eyes lol. I`ll update when the chip arrives. :)
Since I got 64 when I poked 0. Chip 8 must of been working so the link must of been ok then otherwise I would of got 192. Anyway I`ll just join them together with a wire. It looks hard work to put a trace back on the board.
I am 60 in 2022 and worked for LMT Computers Ltd in the mid to late 80s (SPD1 Disk Interface). I then went on to work with MGT to help create the DISCiPLE and some of the Sam Coupe. I was doing this many years ago, but moved away from my "hands on" technical roots, but still in IT. For those that are interested see this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WBA6svOyWb8.html to learn about Little and Big EDNIAN. It is fantastic to see something that I grew up with still giving pleasure to people. It always amused me that Sinclair bought "duff" ram chips that only 1/2 worked and that there was a selector on the PCB to say which part did not work. And having that -5V and +12V inverters to power those really old RAM chips doh! We used to replace the RAM with +5V only chips and ditch the inverters. Keep up the good work!
Thanks! There is an option to replace the 4116 with 4532 chips and do a bit of pin bending and adjusting, it's a bit ugly though, maybe there's some fun to be had making this mod invisible
