My 74LS00 got very hot until I realized I had not removed the wire to pin 4 of the clock's 555 timer while putting in the HALT signal. HTH. BTW, there is no reverse polarity protection here AFIK.
Not yet because I'm figuring this out as I go along, but next video I'll be using one more SST39SF040 (initially as a 256-byte lookup so if you already have an AT28C256 that would be fine) and not long after that I'll be working on input with some push buttons RC circuits and Schmitt inverters for debouncing.
@@user-if2jw1sz7b interesting. I haven't looked too closely at the datasheet maybe the timing is more strict for programming data, or could your chip need to be unlocked with the right input sequence?
@@IanWard1 well i read the datasheet, the truth is i don't understand 100% timing function, for sure im doing somethink wrong idk what is, i never get on my hand flash EEPROM
Off to the chip supermarket. THANKS. I’m playing along at home.
Good job
Does it have reverse polarity prevention? Mine got very hot.
My 74LS00 got very hot until I realized I had not removed the wire to pin 4 of the clock's 555 timer while putting in the HALT signal. HTH. BTW, there is no reverse polarity protection here AFIK.
So you and that guy Ben are friends?
No but my videos are definitely inspired by his
Ian, do you have a list of other things needed to complete the project?
Not yet because I'm figuring this out as I go along, but next video I'll be using one more SST39SF040 (initially as a 256-byte lookup so if you already have an AT28C256 that would be fine) and not long after that I'll be working on input with some push buttons RC circuits and Schmitt inverters for debouncing.
Oh, and I will be using an LCD2004 module for the display in the next video, as seen in some of my other videos
@@IanWard1 NON I2c I take it.
@@markgreco1962 correct
lan is posibple to program SST39SF040 by hand ??
Interesting question! My guess is "yes" but it would take a very long time to program 512KB by hand :-)
@@IanWard1 thanks for replying lan :) well i tried, but i think i can't find the right timing to write data :(
@@user-if2jw1sz7b interesting. I haven't looked too closely at the datasheet maybe the timing is more strict for programming data, or could your chip need to be unlocked with the right input sequence?
@@IanWard1 well i read the datasheet, the truth is i don't understand 100% timing function, for sure im doing somethink wrong idk what is, i never get on my hand flash EEPROM
That's the worst game any human has every created