Ток в цепи идет. Выключатель не на 0-ле?

я не знаю

оно ж не рядом со мной. ВОт и хочу узнать что проверить. Там еще лампочка в выключателе. Неонка видимо

Отключи её.

Понял, попробую как буду на месте

someone familiar with assembly code? I got an old Z80 System here without display. I want to test NOP cycle and need a small loop program. Will this do the job?

; System memory map:
;            0x0000 - 0x7FFF = ROM 8K
;            0x8000 - 0x0FFF = RAM 8k

        org 0x00    ; Reset vector
reset:  jp start    ; Jump to start of main code

        org 0x0066    ; NMI vector
       ; forg 0x0066    ; NMI vector
nmi:  jp start    ; Jump to start of main code

    ;forg 0x0100   ; put this out of the way
    org 0x0100     ; put this out of the way
start:  ld a, 0x33    ; load 0x33 into the accumulator ('3' in ASCII)
    ld (0x8010), a  ; load value of accumulator into memory address 0x8010 (This is in the RAM space)
    ld a, 0x39    ; load 0x39 into the accumulator ('9' in ASCII)
    ld (0x8011), a  ; load value of accumulator into memory address 0x8011 (This is in the RAM space)
    ld a, 0x4B    ; load 0x4B into the accumulator ('K' in ASCII)
    ld (0x8012), a  ; load value of accumulator into memory address 0x4012 (This is in the RAM space)
    ld a, (0x8010)  ; Get value from 0x8010 into the accumulator (Should be 0x33)
    ld a, (0x8011)  ; Get value from 0x8011 into the accumulator (Should be 0x39)
    ld a, (0x8012)  ; Get value from 0x8012 into the accumulator (Should be 0x4B)
    
loop:  jp loop      ; loop forever 

There is a 2764 EPROM and 6 U224 4kbit SRAM modules.

Посмотри видосик, может это твой случай

Без вариантов. Причина в ней.

он лампочку в себя засовывает или лижет включенную?

Посмотри и будет сюрприз)))

Ну а с лампочками достаточно в простой манере объяснено

; System memory map:
;            0x0000 - 0x7FFF = ROM 8K
;            0x8000 - 0x0FFF = RAM 8k

        org 0x00    ; Reset vector
reset:  jp start    ; Jump to start of main code

        org 0x0066    ; NMI vector
       ; forg 0x0066    ; NMI vector
nmi:  jp start    ; Jump to start of main code

    ;forg 0x0100   ; put this out of the way
    org 0x0100     ; put this out of the way
start:  ld a, 0x33    ; load 0x33 into the accumulator ('3' in ASCII)
    ld (0x8010), a  ; load value of accumulator into memory address 0x8010 (This is in the RAM space)
    ld a, 0x39    ; load 0x39 into the accumulator ('9' in ASCII)
    ld (0x8011), a  ; load value of accumulator into memory address 0x8011 (This is in the RAM space)
    ld a, 0x4B    ; load 0x4B into the accumulator ('K' in ASCII)
    ld (0x8012), a  ; load value of accumulator into memory address 0x4012 (This is in the RAM space)
    ld a, (0x8010)  ; Get value from 0x8010 into the accumulator (Should be 0x33)
    ld a, (0x8011)  ; Get value from 0x8011 into the accumulator (Should be 0x39)
    ld a, (0x8012)  ; Get value from 0x8012 into the accumulator (Should be 0x4B)
    
loop:  jp loop      ; loop forever 

Hi. It looks good, but I am not big expert in Z80, so how about to use something like asm80.com emulator to test online? I have tried and got no errors.

oh, thanks, didn't know that site

Paste zour code, and press compile and emulator Then zou will see some buttons on the left side of the screen to step over, etc.

I guess the code right after start label just write some data just for test purpose.

BTw, did you have a chance to finish your hand made microscope? 😜

ah, the LarkBox, yes, it's working fine. I removed the preinstalled windows and put Arch Linux on it. Works exactly like i wanted it to be. Fast enough for the camera. No more screen lagging. The only downside is, the fan is loud like hell. As loud as my 3D printer.

Super, itäs nice when the device is being worked as it was engineered. Could you please share the BOM please? I would like to repeat this one for home use, I guess the food idea to change the fan for some more silent, I guess Noctua should have something good.