I have this INS8073-based board with four TIL-311s, an 8255, a 6116 and a socket for another, an 82S23 PROM, and an MM58174A. The MM58174A is a clock/calendar chip for which I can't seem to get the appnote for. Google reveals an old location at the Nat'l Semi webpage (it has been removed from their appnote dir), and a single reference at http://www.nalanda.nitc.ac.in/industry/appnotes/Natsemi/AN-359.pdf which refuses my connections (could be down, could be blocking U.S. access; not sure which).

P.P.S. - in case you don't recognize the CPU part number, INS8073, it's a microcontroller with Tiny Basic onboard - you wire on a level shifter,

-----Original Message----- From: cctech-bounces(a)classiccmp.org [mailto:cctech-bounces@classiccmp.org] On Behalf Of Ethan Dicks Sent: Sunday, April 18, 2004 7:31 AM To: cctalk(a)classiccmp.org Subject: Does anyone have National Semiconductor's Appnote AN-359? I have this INS8073-based board with four TIL-311s, an 8255, a 6116 and a socket for another, an 82S23 PROM, and an MM58174A. The MM58174A is a clock/calendar chip for which I can't seem to get the appnote for. Google reveals an old location at the Nat'l Semi webpage (it has been removed from their appnote dir), and a single reference at http://www.nalanda.nitc.ac.in/industry/appnotes/Natsemi/AN-359.pdf which refuses my connections (could be down, could be blocking U.S. access; not sure which). I don't care if the Digital Library of the Calcutta Technical Institute is up or not; all I'm after is the app note for the MM58174A. Does anyone on the list have the file 'AN-359.pdf'? Thanks, -ethan P.S. - I realize a picture speaks a thousand words, but does anyone recognize the device I've described? It was a gift from someone, years ago. I brought it with me both as a source of TIL-311s and because it's a complete INS8073 SBC. From what I can gather so far, it's pretty close to the Nat'l Semi reference design, down to using a 741-style RS-232 converter for the console interface. The only useful markings on the PCB are "MC-1N REV-A". The layout of the TIL-311s and the four pushbuttons on the corners of the front panel suggest to me some sort of digital timer. There's a 2x5 jumper block on the front that appears to be input power, serial in/out and a few of the CPU flag pins (F2, F3). There's a 1x9 jumper block on the back that seems to be just options, not I/O, but I haven't traced the whole board out yet. P.P.S. - in case you don't recognize the CPU part number, INS8073, it's a microcontroller with Tiny Basic onboard - you wire on a level shifter, an SRAM and an optional ROM, and _bang_, a microcontroller with a built- in development system. It's the same processor used in the RB5X robot. I have had this board for years, and last year, I picked up a few CPU chips on ePay for a few bucks each. They are one of the many classic toys I brought with me to play with through the long, winter night. -- Ethan Dicks, A-130-S Current South Pole Weather at 18-Apr-2004 13:50 Z South Pole Station PSC 468 Box 400 Temp -70.8 F (-57.1 C) Windchill -94.5 F (-70.3 C) APO AP 96598 Wind 6.2 kts Grid 074 Barometer 689 mb (10289. ft) Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html