If I had to guess, the window on that chip indicates that it is probably a UV-erasable EEPROM. It most likely shipped with a sticker to keep it from being erased, which has now fallen off. I'd probably put a new sticker on there to block the sunlight and keep it from getting wiped.
On Fri, Dec 1, 2017 at 9:39 AM, Gary Satterfield <[email protected]> wrote: > I also thought it strange that there is a small round window on the chip > nearest the TI video controller. The date on the card is 1988 too. :D > > On Friday, 1 December 2017 03:53:51 UTC-6, Gregg Eshelman wrote: >> >> Combine a versatile Non-VGA Video Controller like that TI chip (it also >> has a line drawing mode, I presume for vector monitors) with the Brooktree >> 256 color palette RAMDAC, along with the male DE-9* connector and I'd say >> you have some rather proprietary 8bit raster graphics display card. Most >> likely not a vector display card with an 8 bit color raster RAMDAC. ;) >> >> Find the RAM chips and count up how much there is to get some idea of the >> maximum possible resolutions it could support at 1, 4, 16 and 8 bit color >> depths. >> >> It could be for a high resolution 1 bit monitor, but why use a DAC that's >> made for color on it? I've done some searching and the only NuBus video >> card I could find with a DE-9 is a Radius Full Page Display card, but it >> has a female instead of a male connector. >> >> There were monitors made with a single DE-9 port and stitches to change >> between TTL mono/color and analog modes so one monitor would work with any >> PC video output, usually up to 800x600. Some also supported the oddball Mac >> video modes which were slightly larger than 640x480 or 800x600. 832x624? I >> still have such a monitor. IIRC it's the original model of NEC MultiSync. >> No model designation, just MultiSync. Has a built in cooling fan and a worn >> out CRT. >> >> Analog RGB video can be done using only 8 pins. That card is certainly >> not doing any monitor identification through the connector. Might be fixed >> resolution/colors/frequency. Might support several. Given the age of it, it >> *might* use the 9 pin VGA pinout. Easy to find with google. >> >> http://www.icpdf.com/icpdf_datasheet_5_datasheet/TMS34061FNL >> _pdf_1548294/#view >> >> *There is no such thing as a DB-9 connector. The B size is the 25 pin >> used for Mac SCSI and PC parallel and 25 pin serial ports. The Mac video >> connector before Apple adopted the VGA standard was a DA-15, also used for >> PC joysticks. The 15 pin VGA port should properly be called a HDE-15 but >> most people call it HD-15. Apple's 19 pin floppy drive port was only ever >> used for that purpose and has no official letter size designation. The guy >> who has the Big Mess-o-wires website makes a solid state floppy drive >> replacement and had to reverse engineer that connector to have a large >> batch of new ones made in China. Thus at one time he had the entire world's >> supply of new Apple external floppy drive connectors in boxes on his back >> porch. >> >> On Thursday, November 30, 2017, 10:24:43 PM MST, Gary Satterfield < >> [email protected]> wrote: >> >> >> After shuttering my Mac repair and consulting business several years ago, >> I recently decided to dig through all the miscellaneous stuff I collected >> over the years. The Nubus card you see in the attachments has me scratching >> my head about what exactly it is. The only thing I am sure of is that it is >> some sort of video card, judging by the Texas Instruments chip (I Googled >> it to see what it was). The thing that throws me is the video-out >> connection - it appears to be DIN-9, but only in reverse. >> >> Have a look at the pics and see if you can tell me what this weird thing >> is! Please? Thank you kindly! >> > -- > -- > ----- > You received this message because you are a member of the Vintage Macs > group. > The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > To leave this group, send email to vintage-macs+unsubscribe@ > googlegroups.com > For more options, visit this group at http://groups.google.com/ > group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Mike http://ravuya.com -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
