Sean, Fred, and Glen — Sorry, late to this ISA card thread. I worked in Tech Support for an Apple/IBM/HP/Novell retail computer dealer, during summers in early 1980s, when in Graduate school. So I saw the “wide selection” of add-in cards for IBM PC/XT and compatibles. == This is a “Taiwanese generic 6-Pak” Add-In (8-bit ISA) expansion card. RAM 384 kB; Serial port, Parallel port, Game port, AND Real Time Clock !
Glen is CORRECT, the National Semiconductor MM58167 is the RTC IC. Texas Instruments bought out National in 2011, data-sheet still available. The “solder-in” B1 battery has been cutout (open space below/left of MM58167). Replacement battery (likely ~ 3 to 3.6 Volt) can be acquired from Digi-Key. Take measurements and closeup photo of “B1” Area, to CONFIRM Model and Size. — My Quick Guess ? Tadiran TL series 1/2 AA with Axial pins, 3.6V High Capacity Cylindrical battery http://www.tadiranbat.com/assets/tll-5902.pdf Tadiran TL-5902/P .... $6.65 https://www.digikey.com/en/products/detail/tadiran-batteries/TL-5902-P/512507 greg, w9gb chicago === Date: Thu, 15 Oct 2020 17:34:58 -0700 From: Glen Slick <[email protected]> To: "General Discussion: On-Topic and Off-Topic Posts" <[email protected]> Subject: Re: Identifying a Mystery ISA Card On Thu, Oct 15, 2020, 5:24 PM Fred Cisin via cctalk <[email protected]> wrote: >> On Thu, 15 Oct 2020, Sean Ellis via cctalk wrote: >> I got this (currently exploded) mystery RAM, RTC, and I/O board out of >> a dead Sanyo luggable the other night, and once I replace the burned >> up tantalums I'd like to put it in my 5150 so I can get a full 640k of >> RAM. >> Question is, does anyone know what this board is? It's a completely >> anonymous board with not even an FCC ID to go off of. I'm assuming the >> RAM is at least strapped right; all the banks are full which should be >> 384k, and the Sanyo was a 256k machine = 640k. >> Here's a couple pictures; one's an actual picture of the card and the >> other is a simplified TULARC/TH99-esque vector of what's on the board. >> https://i.imgur.com/WhO4cco.jpg >> https://i.imgur.com/uBCkv5G.png > > It resembles, although doesn't match, the AST Six-Pack. > But the AST Six-pack had a clock circuit. Isn't the 24-pin DIP part number MM58167 ,shown in the images referenced above, an RTC chip?
