https://forum.vcfed.org/index.php?threads/dec-ttl-part-number-equivalents.7… is a collection of rumours about what DEC 8881's DS3862 was a National Semi trapezoidal (ie slew rate limited driver), whether that makes a DS3881 a National part is a good question (never found it). DEC documentation on LSI-11 BusDrivers mentions the 8881 as having DEC order code 957, and describes it as a bus driver. The documentation goes on to say that a 8641 is a 8640 (Bus Rx) integrated with a 8881 (Bus driver); followed by pin out (14p classic TTL NAND pin out) and parametrics. I shall try to find a link to the pdf; I have pp55-58 on A4. The DS3881 might be an urban myth, perpetuated typo / error ? Martin PS off looking for URLs -----Original Message----- From: Holm Tiffe via cctalk [mailto:cctalk@classiccmp.org] Sent: 31 July 2025 20:01 To: cctalk(a)classiccmp.org Cc: Holm Tiffe <holm(a)freibergnet.de> Subject: [cctalk] Q about DS3881, N8881 DEC8881.. The russians build PDP11's and VAXes. They made chips similar to the special DEC chips. For example there is an K559IP2 which is an DS8640, and there is an K559IP1 and they list an DS3881 as equivalent, 4 NAND gates "standard DEC" Bus driver ..hmm. 1,2-3, 4,5-6 10,11-9 and 13,14-12. ..input,input-output. 16 VCC, 8 GND, 7,15 free. It is an 16 pin 300mil DIP. Now I have problems to find a Datasheet for an DS3881 which is NOT an CCFL Inverter from Maxim/Dallas/Analog but I' pretty shure I've seen such beasts already in the past. An DEC8881 is sitting next to an DS8640 on a DLV11 I have in my hands..but this is an DIP14 Chip (similar to an 7401 or an 7439). What the heck could a DS3881 be? (DEC Bus drivers are getting rare those days, that's the cause that I've bought those russian chips in the past for cheap.. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741