USB Programmer for EPROM 27C, (27C256, 27C512, etc.)

Product Information

MC68HC08AS20, MC68HC08AS32, MC68HC08AS60, MC68HC08AZ32, MC68HC(9)08AZ32A, MC68HC908AZ60, MC68HC908AZ60A

Erasure of the EPROM begins to occur with wavelengths shorter than 400 nm. Exposure time for sunlight of one week or three years for room fluorescent lighting may cause erasure. The recommended erasure procedure is exposure to UV light at 253.7nm of at least 15 Ws/cm 2, usually achieved in 20 to 30 minutes with the lamp at a distance of about 2.5cm. [9]

Support

So many things these days are mass produced, not designed to last, and make as cheap as possible for as much money as possible. We started RetroSix not as a mass market business, instead with the aim of perfection. Recreating moulds of original shells, casting them from quality ABS, redesigning hardware such as power supplies, USB-C, audio and more, to upgrade your consoles to the highest quality available. No cheap junk sold for profit. Later the decreased cost of the CMOS technology allowed the same devices to be fabricated using it, adding the letter "C" to the device numbers (27xx(x) are n-MOS and 27Cxx(x) are CMOS). Comparing the pinouts for the 28C16 and 28C256 shows that they both have pretty similar layouts. On the left hand side of the chip everything is the same just with the new pins 1 and 2 added (A14 and A12). On the right hand side we need to move Vcc to the new pin 28 and add A13 and A11 to replace the it and /WE. 28C16 pinout 28C256 pinout Now with that I am getting the state showing as being 'Eprom not Present' or 'Eprom Blank' depending if the EPROM is inserted or not. It does not appear to be able to read the size of the EPROM chip, it just says Size=0k. When I try to read the chip it doesn't show anything at all.

The programmer needs to be configured for whatever type of EPROM you are using. The Willem requires you to set jumpers and dip switches whereas my TOP 853 allows chip selection from software. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder. So I got out my old beebug kit and predictably, there were issues that weren't there when I last used it! This article is just a basic primer. There is a lot more to know about EPROM technology so Google about for the specific information you might need. Have fun! I'm looking for something that programs faster although I don't program very often! It doesn't have to cover everything as I will still keep the EPP2 connected. Super fast industrial universal programmer with ISP capabilities and USB 2.0 connectivity. The 48Pro2AP is built to meet the demands of production programming with automated handlers and ATE machines...Choosing a programmer ( Note: this is what I used in 2012, when this article was written. I'm sure there are better solutions out there nowadays!) So what if the thing that we want to store is bigger than complete text of the Ghostbusters theme as written and performed by Ray Parker Jr? As it happens, you can get EEPROM devices with much larger storage. For instance, the Microchip 24LC1025 can store up to 1025 Kbits! That's 128KB, enough space to have some real fun with! There are XXXX different eeproms and mcu´s and some programmers can read some of them for rest you need other programmers. I’ve also seen people use opto-isolators to drive Vpp pins too. Not an approach I’d use, but it definitely does work.

As I suspected the "Size" indication is related to the rom image rather than the IC, so it can't detect the size of a blank one. I had a Willem but it died so my current programmer is a Top 853 out of China (fig 3). It's also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link. It seems to work well, although at the time of writing the manual for this Chinese device appears to have been written using an early version of Google Translator! It's almost completely unreadable. If you know the basics though the software is easy enough to follow.The ability to allow for the erasing and reprogramming of single bytes or individual words at a time makes it ideal for storing and retrieving very minimal files. Devices relying on EEPROM for parameters or calibration coefficient data is a common scenario. Other typical uses include storage of elements like counters, bootloader EEPROM configurations, powering remote keyless systems, and keeping state between power transitions. a b c "1971: Reusable semiconductor ROM introduced". Computer History Museum . Retrieved 19 June 2019. I dont know if I should just make it on veroboard as it was in the beebug magazine and see what happens. I thought I'd make a PCB that way I could reduce the size a bit and out it in a small case. But alas, it wasn't to be. I'm not sure if there's a problem on my printer port / user port or both. EEPROM stands for Electrically Erasable Programmable Read-Only Memory. To gain a better understanding of what these chips do, and what sort of applications EEPROM products are used for, it helps to break down the meaning of each word in its full name: Electrically Erasable

In other words, to erase your EPROM, you would first have to X-ray it and then put it in an oven at about 600 degrees Celsius (to anneal semiconductor alterations caused by the X-rays). The effects of this process on the reliability of the part would have required extensive testing so they decided on the window instead. [11] There are two versions of the gerbers. A “Long” version which has the exact dimensions of an Arduino Mega. Choose this if your PCB house doesn’t charge extra for exceeding 100x100mm dimensions. Total size is101.5mm x 53.5mm. But there’s a catch with the 28C256: it has something called software data protection (SDP), which protects data from being accidentally overwritten. With the smaller 28C16 (as used by Ben) you can write data in the same way you would with a RAM chip, just by strobing the write pin. You can do the same with the 28C256 if the SDP is disabled, but if it’s enabled then you need to send a specific ‘command sequence’ to the chip. The SDP can be disabled but this requires a similar command sequence 1. U.S. International Trade Commission, ed. (October 1998). Certain EPROM, EEPROM, Flash Memory and Flash Microcontroller Semiconductor Devices and Products Containing Same, Inv. 337-TA-395. Diane Publishing. pp.51–72. ISBN 1-4289-5721-9. The details of SEEQ's Silicon Signature method of a device programmer reading an EPROM's ID.

Construction & testing

Microsoft 64-bit operation systems doesn't allow direct access to LPT port, therefore the communication speed between PC and programmer is very low. In case of Windows x64 OS we recommend to use only USB connected programmers.