Found out my MiniPro TL866A maximum programing voltage for EPROM is somehow only 12V (measure from one of the two capacitors near the ISP connector after issue a write to "21V 2716 EPROM" from minipro's profile).

While I can use old Willem ERPOM 3.5 Programmer to program 25V ERPOM, it will require me to use my Windows XP PC that have parallel port on the motherboard, which are kinda in storage right now and not ready for use (too lazy to set it all up lol).

I have found forum post at https://www.eevblog.com/forum/testgear/modification-to-add-the-missing-21-and-25-volt-vpp-ranges-to-your-tl866ii-plus/ details how to add 21V or 25V EPROM support to TL866II Plus, also including TL866A.

The 10K resistor value for TL866A didn't work for my programmer as the voltage output are too low (about 18V), so, I have to modified the instruction a bit with these resistors added to a jumper connect to ground

- 5.6K to get 20.3V for 21V EPROM
- 10K (must also enable 5.6K) to get 24.4V for 25V EPROM

Below are the image of modification I did.

#minipro #TL866A #epromprogrammer

Nachbildung des REX 9628 External Kernel 8 Modul

Ein neues Board aus Bildern von alten Boards erstellen, das war mein Ziel. Leider gab es immer nur Fragmente, und das von verschiedenen Versionen. Daher war eine exakte Nachbildung leider nicht möglich, aber die Platine als solches wurde neu erstellt. Das erforderte einige Sch…

#c64 #Cartridge #commodore #diy #EPROM #Extern #JLCPCB #Kernel #löten #Modul #Replica #REX #Schematic #TL866A

https://dirkwouters.de/rex-9628-external-kernal-8-cartridge/

Programming PALs in 2021

The [IMSAI Guy] has posted a follow-up video with all the details of how he programs GAL22V10 chips in the modern era. We noted that this was missing from his stepper motor project a few days ago, and before we could even ask him, he answered. And no, you won't have to dig that old Intel 486 DX2-66 out of the closet and search eBay for working floppy drives. It turns out the answer is easier than you'd think.

Microchip now owns WinCUPL through its acquisition of Atmel in 2016, and offers WinCUPL as a free download from the Microchip website. This runs only in Windows, although some users report success running under Wine on Linux. This tool will compile the design, but you still need to program the chip. If you've done any EEPROM programming lately, chances are you have one of the TL866A MiniPros laying around -- this programmer can handle CPLDs, PALs, and GALS as well as EEPROMS. [IMSAI Guy] walks you through the programming procedure, and if you've programmed EEPROMs before, the process will be familiar.

For those who prefer the Linux or Mac environment, there are some alternatives. We've seen GALasm used on several projects such as [Ken Yap]'s 8085 Minimax. The GitHub repository for GALasm states that commercial use is strictly prohibited, so take note if this applies to your project. As for controlling the TL866A, there is a Linux port called minipro available on GitLab. The remaining hurdle if you want to experiment with these programmable logic chips it to actually get them -- many are now obsolete. But it looks like you can still buy Lattice and Microchip (Atmel) ones from various sources. Happy Programming.

#techhacks #gal #galasm #minipro #pal #palasm #tl866a #wincupl