What is this? - Page 1
Forum section: electronics / general

author: myster1086
author_rank: Contributor
timestamp: December 19, 2018, 05:12:14 am
content: Looks like ram. Came from a board that runs a ct machine

author: BravoV
author_rank: Super Contributor
timestamp: December 19, 2018, 05:13:46 am
content: Peel label & google ?

author: Richard Crowley
author_rank: Super Contributor
timestamp: December 19, 2018, 05:48:11 am
content: All you can tell from that photo is that is a 42-pin PDIP.Could be a microcontroller, or a CPU or memory, or whatever.The label has a "house-number" on it which will mean nothing without the unpublished secret decoder ring.Peel the label off. Otherwise you will likely get nowhere.If you are lucky, maybe there will be an industry-standard part number visible.With the brand name of the gear that it came out of, you might be slightly ahead in deciphering the "house-number".

author: amyk
author_rank: Super Contributor
timestamp: December 19, 2018, 12:48:27 pm
content: Probably ROM of some sort. The sticker may be covering the UV window, or it could be mask ROM/OTP.

author: Gyro
author_rank: Super Contributor
timestamp: December 19, 2018, 01:21:35 pm
content: QuoteVery unlikely - It's a plastic package.

author: SeanB
author_rank: Super Contributor
timestamp: December 19, 2018, 05:53:18 pm
content: Very likely it is a OTP Eprom, which is combined along with some DRAM, probably 256M or such, into a SIMM package so that you can simply plug in the module to do firmware upgrades. Uses a cheap commonly available SIMM socket on the mainboard ( and I guess the processor there is a 68000 series CPU as well) and footprint that is also an industry standard pinout with only a few extra control lines, normally used for communicating to the on SIMM identity, that provide the chip select and output enable for the EPROM.Common on embedded boards, as it allows the manufacturer to provide a very easy to install upgrade, but this is still not easy to copy without some work, and is not as easy to pirate as a software firmware upgrade. I have some Tektronix Phasor printer boards with a few of these on them, providing on the one the main printer firmware and RAM, and a few more providing additional font ROM packages, complete with Adobe provided licenses as well printed on the label.

author: CJay
author_rank: Super Contributor
timestamp: December 19, 2018, 06:25:52 pm
content: It's a DRAM, there's a parity chip next to it, my guess would be a 72 pin one.

author: myster1086
author_rank: Contributor
timestamp: December 20, 2018, 02:25:11 am
content: lol ya'll rock, i couldnt upload more than 1 pic, only 1kb can be uploaded? anhywho it looks like a ram stick ill peel the sticker thought the numbers meant something, no wonder google was stumped lol thanks guys

author: amyk
author_rank: Super Contributor
timestamp: December 20, 2018, 12:49:33 pm
content: Quote from: CJay on December 19, 2018, 06:25:52 pmPlease find a DRAM in 42-pin DIP.

author: oPossum
author_rank: Super Contributor
timestamp: December 20, 2018, 01:12:51 pm
content: Looks like J lead (SOJ), not DIP. My best guess is 16 or 18 bit FPM/EDO DRAM. Really need to see the whole board.

author: CJay
author_rank: Super Contributor
timestamp: December 20, 2018, 06:50:28 pm
content: Quote from: amyk on December 20, 2018, 12:49:33 pmhttps://www.digchip.com/datasheets/parts/datasheet/301/MT4LC1M16E5DJ-6-pdf.phpThat do you or would you like to see some more?Oops, of course, it's SOJ, not DIP but then the chip in the OP's pic is also SOJ.

author: myster1086
author_rank: Contributor
timestamp: February 28, 2019, 03:24:09 am
content: sorry for the gap in time, it is the the dram to, get this, a nuclear gamma camera, aka cat scan lol buddy has the lights as well very interesting motherboard actually boots, no os i found tho can get going....just blinks