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I’m also assuming that we don’t care about WE since we won’t be programming it in place? I’ve never used the 28C family.

– Grassroots ECU Development – Library . 29C

That would be pretty cool, but I would need to be able to select between U18 or U I’d be happy with as few as 8 address bits we use two LSs for the PCalthough I doubt anyone makes something that small. Though replacing the stock ibm one gave me kb functionality, i would like 1. I’ve thougt the same thing, but don’t know where to start. So I’ll make up an adapter so that I don’t have to solder on the chip or the motherboard. The code for this is above my abillities right now, but maybe in a year or two or less if I can find the time to get really serious about learning Assembly.

John Miles 3 datashee. If so, I’ve wasted a lot of time putting 27cs under the UV light for erasure.


Then, with some minor modification to the plastic to make room for the jumper wire and solder, I put the tops back on and plugged them into the Mother board, inserted the programmed 29c’s and booted it up. The users who voted to close gave this specific reason: They tend fatasheet be higher capacity than eeprom devices, so more address lines to tie but otherwise equivalent to eeprom for your purposes.

Again, not a difficult mod. Both pin 1’s are already isolated, so that won’t be a problem. Install the program attached 299c256 this post http: Perhaps the limited available time could be used more productively with modern hardware. The bios works, buy the at still refuses to employ 1.

U18 and U19 have different address ranges. I also don’t care about speed. I’ll check and see if I can’t give a better answer.

29c256 datasheet pdf

I believe the 29Cxxx series is now mostly flash memory. Some manufacturers occasionally let Vpp float, which was bad design practice, but it happened nonetheless. If it doesn’t like your drive, then the problem’s hardware, not software.

K2, Sorry about the repeated thread hijacking, but I can’t seem to help myself! That doesn’t surprise me.

Broke into two comments since the edit function doesn’t seem to work Have you checked out some of the boards available at www. There’s a lot of good stuff in the 29C datasheet. Easy enough to work up a simple adapter. Actually, it’s abut as you know it uses the early K motherboard. That’s a you have? Thread Re-Hijacking One of the originals of this thread, the at problem. The issue is mostly one of terminology. BTW, when ordering EPROMs be sure to check the complete part number carefully to make sure you’re getting the right package and that they are indeed eraseable; one-time-programmable OTP versions without a quartz window usually have the same base part number, with just a different letter in the suffix denoting a different package i.


or 27C rom chips [Archive] – Vintage Computer Forum

The 29C should work without any socket mods. I wouldn’t think that it does. Would the 28C family be a good place to look?

It’ll put the students in touch with the hardware in a datasheer that an anonymous microprocessor or FPGA chip can’t match. Then, you wouldn’t even have to remove the chip from the socket Hey Chuck, Do pin 22 of u18 and u19 need to remain connected to their original mother board conections, or should they be isolated before connecting them to pin 3 of u13?