Great overview. I just happened to be looking at options for replacing ROMs in various machines as well. It's a slightly different use case. But, I can definitely add the SST395F to my parts bin for when I run out of 28-pin parts. BTW, The Multicomp BLE DMM @7:31 caught my eye. That's the one I use daily (and used to have it stream measurements to a web browser back when I was doing live streams.)
Yeah, I’m a fan of value for money with that DMM. Took it for the capacitance and frequency modes - haven’t gotten too much out of the BLE mode yet :) Maybe it won’t be so bad for recording measurements either.
As long as you have the space on the board - and even if not you might be able to stack some sockets to lift the extra pins. Sometimes it’s easier to make the modifications to a sacrificial socket instead of directly on the chip.
If it was a jumper we’d be making a short when programming/verifying the chip. This way it’s basically unmodified from the programmer hardware’s point of view - for the WE I use a 10k because an accidental write is worse than a potential misread, so I want a bit more oomph.
The 39SF040 has A17 on pin 30, so you can't take advantage of the "no connect" on that pin for jumpering VCC to pin 32 - unless you only use the top half of the chip. It also has A18 on pin 1 so it needs another resistor. It's easier with the 010, but not impossible with the 040.
i don't know what i just watched but my brain said wow this is soo cooool !!! I guess it was just missing a real i.e visual goal that you set to achieve in this or maybe I will find it in the next video. About it actually working faster. as now what I saw, was an epic chip swap for the same ROM job :)
Thank you! It's nice to know there are still a few non-volatile memory systems available that don't have a microcontroller under the lid somewhere.
@@MsAlPatina noo even before we always need a microcontroller
Great overview. I just happened to be looking at options for replacing ROMs in various machines as well. It's a slightly different use case. But, I can definitely add the SST395F to my parts bin for when I run out of 28-pin parts.
BTW, The Multicomp BLE DMM @7:31 caught my eye. That's the one I use daily (and used to have it stream measurements to a web browser back when I was doing live streams.)
Yeah, I’m a fan of value for money with that DMM. Took it for the capacitance and frequency modes - haven’t gotten too much out of the BLE mode yet :)
Maybe it won’t be so bad for recording measurements either.
Thanks for sharing! Great info!
Thank you!
Great work 👌👏👍
Using this method, could you theoretically replace any eprom with these flash chips without making any changes to the software?
As long as you have the space on the board - and even if not you might be able to stack some sockets to lift the extra pins.
Sometimes it’s easier to make the modifications to a sacrificial socket instead of directly on the chip.
Why the 300k resistor between A15 and A16? What is wrong with a direct jumper?
If it was a jumper we’d be making a short when programming/verifying the chip.
This way it’s basically unmodified from the programmer hardware’s point of view - for the WE I use a 10k because an accidental write is worse than a potential misread, so I want a bit more oomph.
Can we only use the 39FS010 or also 39FS040?
The 39SF040 has A17 on pin 30, so you can't take advantage of the "no connect" on that pin for jumpering VCC to pin 32 - unless you only use the top half of the chip. It also has A18 on pin 1 so it needs another resistor.
It's easier with the 010, but not impossible with the 040.
i don't know what i just watched but my brain said wow this is soo cooool !!! I guess it was just missing a real i.e visual goal that you set to achieve in this or maybe I will find it in the next video. About it actually working faster. as now what I saw, was an epic chip swap for the same ROM job :)