If you have a dedicated EEPROM programmer this is not a problem, the programmer will handle the data protection for you, but many hobbyists prefer to save a few pennies and using Ben’s own breadboard EEPROM programmer. My original ‘BenPrommmer’ with 28C16 EEPROM If you’ve written data to the chip, either with my code or a normal programmer, then my code should be able to read it whether SDP is on or off (ie SDP doesn’t affect reading). &ff is the default data for an erased EEPROM.

MC68HC912B32, MC68HC912BE32, MC68HC912D60, MC68HC912D60A, MC68HC912DC128A, MC68HC912DG128, MC68HC912DG128ASignals are transmitted through the connection pins of the chip programmer into the target device. Some devices require data on the serial pins while others receive the data via a serial interface. Development of the EPROM memory cell started with investigation of faulty integrated circuits where the gate connections of transistors had broken. Stored charge on these isolated gates changes their threshold voltage.

I'd like comments on the above. This has worked well for me in the past but I'd like the guidance of people smarter than myself. Auto Recognition of File Types We support almost all kinds of known file formats including file formats with automatic recognition functions: Binary, Intel (linear & segmented) Hex, Motorola S, Tektronix (linear & segmented), JEDEC, POF, etc. There is no such thing as an "EPROM program" ... you need to know what the EPROM supplies its data to. Any such information you can add to the question may help, even a good quality photo of the PCB. The programming process is not electrically reversible. To erase the data stored in the array of transistors, ultraviolet light is directed onto the die. Photons of the UV light cause ionization within the silicon oxide, which allows the stored charge on the floating gate to dissipate. Since the whole memory array is exposed, all the memory is erased at the same time. The process takes several minutes for UV lamps of convenient sizes; sunlight would erase a chip in weeks, and indoor fluorescent lighting over several years. [7] Generally, the EPROMs must be removed from equipment to be erased, since it is not usually practical to build in a UV lamp to erase parts in-circuit. Electrically Erasable Programmable Read-Only Memory (EEPROM) was developed to provide an electrical erase function and has now mostly displaced ultraviolet-erased parts.MC68HC05B6, MC68HC05B8, MC68HC05B16, MC68HC705B16, MC68HC05B32, MC68HC05E6, MC68HC705E6, MC68HC05H12, MC68HC05L28, MC68HC05P3, MC68HC705P3*,MC68HC05X16, MC68HC05X32

comfortable and easy to use control program, work with all versions of MS Windows Windows XP to Windows 11 32-bit and 64-bit*Some time ago I needed to program an MCM68766 EPROM to upgrade the BIOS in an IBM PC 5150, and in the process discovered that hardware which can program these is rather difficult to come by. You also try firing just the disableSDP routine and then testing with your other programmer if SDP has actually been turned off. First rule is to know the kind of EPROMS you want (or are likely to want) to burn and get a programmer that can handle them. There are a number of programmers on the market. Beware though, as many modern ones will not handle the smaller capacity ICs like the 2716 and 2732 ones found in very old microcomputers.

Chip programmers known as device programmers or IC programmers are items of electronic equipment that arrange written software to configure programmable devices. They support a broad range of chip sets such as EPROMs, EEPROMs and flash, ROMs, GALs and microcontrollers. In the case of EPROMs, once they have been programmed, they can be erased with the use of an EPROM UV eraser. How do chip programmers work? I do still have some old eproms that have been stored in my mums loft for ages. These are the ones with the square window in.

Why is 2708/2704/TMS2716 difficult to program?

The programming "delay" is incorrect. There will be a setting for this somewhere in the software. It normally defaults to some value when the IC is selected. Try smaller or larger values and see if this fixes the problem. I found I had to change the delay value from default 5ms to 1ms before I had success burning my 2716 and 2732 EPROMS with my Top 853. Bear in mind an unsuccessful burn will probably require the EPROM to be blanked again. EEPROMs can be a bit temperamental, especially with fake chips around. Different brands can behave slightly differently, so what works for me with my setup may not work for others. If that's a Z80 microprocessor (for example), there is such a thing as a Z80 program, which you may be able to disassemble (read the EPROM in the burner, write out as a hex file, probably INTEL HEX format), then run through a disassembler program to generate a source listing in Z80 assembly language. I don't know your programmer. But normally, you clear the buffer (fill the whole adress space of the 2716 EPROM with ffs), then read your file at the beginning of the buffer. So the ffs of the first half of the buffer will be overwritten by the content of the 2708 file. The second half will remain ffs. Then you can burn the buffer into a 2716. Universal 40-pin programmer with ISP capabilities and USB 2.0 connectivity. Dataman 40Pro is a small, fast and powerful programmer designed for a huge range of programmable devices...