Join the free clubhouse on Discord: discord.gg/kmhbxAjQc3 Let's chat about what you like best about old chips, electronics, breadboards and hacking all sorts of things! P.S. Link to buy a 65uino-kit in the description (from me)
Mine got to the US with no issues! I bought it since I’m always late for any giveaway, now waiting for the 6507 that are coming in a slow boat from China. This weekend I will finish up the board and hotwire one of the 6502’s I have to give it a try
So happy to hear that! I'm really excited to see what people do with them. Looks like I wont have too much trouble making a pretty decent EEPROM programmer out of it.
Long time ago, in 1991 or 92, I built UV-EPROM programmer based on TL497, MC14051 and CA3140. Digital part interfaces ISA-bus to EPROM's address, data and control bus. Program based on assembly language. That's long time ago.
I found it the easiest to just use trimmers / potentiometers in situations where I need to get a voltage exactly, since resistors always lie about their actual value, and I don't trust tolerances anymore.
I think you’re absolutely right. For the PCB I’m thinking a trimmer in series. Some also need 13V programming voltage(or more) so it will need some jumper options.
I optimized a bit after I recorded this - the regulator does 27 volts without issue. When this ends up on a board, it'll have a pot for adjusting VPP. The only thing it wont do is to supply negative 5V for ancient ones - but it'll still make it easier to test and program those on a breadboard.
Join the free clubhouse on Discord: discord.gg/kmhbxAjQc3
Let's chat about what you like best about old chips, electronics, breadboards and hacking all sorts of things!
P.S. Link to buy a 65uino-kit in the description (from me)
Mine got to the US with no issues! I bought it since I’m always late for any giveaway, now waiting for the 6507 that are coming in a slow boat from China. This weekend I will finish up the board and hotwire one of the 6502’s I have to give it a try
So happy to hear that! I'm really excited to see what people do with them. Looks like I wont have too much trouble making a pretty decent EEPROM programmer out of it.
Long time ago, in 1991 or 92, I built UV-EPROM programmer based on TL497, MC14051 and CA3140. Digital part interfaces ISA-bus to EPROM's address, data and control bus. Program based on assembly language.
That's long time ago.
I plan to go even simpler than that :)
I found it the easiest to just use trimmers / potentiometers in situations where I need to get a voltage exactly, since resistors always lie about their actual value, and I don't trust tolerances anymore.
I think you’re absolutely right. For the PCB I’m thinking a trimmer in series.
Some also need 13V programming voltage(or more) so it will need some jumper options.
What about older devices that need 24v to 27v ??
I optimized a bit after I recorded this - the regulator does 27 volts without issue.
When this ends up on a board, it'll have a pot for adjusting VPP. The only thing it wont do is to supply negative 5V for ancient ones - but it'll still make it easier to test and program those on a breadboard.
Yay! I'm the first poster!
You're welcome