A google sheets based assembler or compiler for SAP-1 computers like the Alberto Malvino/Ben Eater computer. It has some basic error detection and as you type your code you'll see that the binary is created in real time.
I've set the code to be 16 bytes long to fit with these type of systems and their 4-bit addressing.
I've also included an instruction set box where you can edit any of the mnemonics
to suit your own system and add further instructions as you see fit.

The current updated version is available from this link.
https://docs.google.com/spreadsheets/d/1_Tl5KNgKaswhweud-zKYvOm14mVvEHJaf5_i5ug35Iw/edit?usp=sharing