test-drb September 2006

test-drb@ccmp.vtda.org

200 participants
374 discussions

by Billy.Pettit＠wdc.com

Roy J. Tellason wrote: Got one 8-bit card here that also has an internal edge connector and I'm guessing it's a floppy interface -- there's a crystal, one big chip labeled Zilog Z765APS and what I'm guessing is a data separator chip socketed, looks like UM8326, and a bunch of LSTTL glue logic. ------------------------------------ Billy: Very likely - the Z765 was a cross license chip from NEC. I think they got the best of the deal, being able to use Zilog cores. The 765 never impressed me. --------------------------------------- Got one which is an 8-bit card only there's a little sticker near the card edge connector that says "pls plug into the 16 bits slot only" -- why would they do that? This one has a DB25M on the metal bracket, which is also labeled "Scanner Interface", is this supposed to be some kind of crude SCSI? There are a couple of chips labeled "SPOT" (a logo actually), and silkscreened on the board it says "SPOT Fototak 2E-Card". The note on the bag says "Parallel port" but I'm not sure that means anything. About four chips on the board (2 of which look like RAM) and a jumper block, 2x3 with 2 on there. ----------------------------------------- Billy: This sounds like the primitive SCSI that a lot of scanner folks would send out with the early scanners. PCs had moved over to IDE, so a lot of low cost systems didn't have native SCSI boards. Adaptec made a slew of these. Even new and at that time, you could find them at Fry's for $12-15. I remember seeing a few of them with the early external CD burners. Many were SCSI, at least up to the 8X level. Then ATA won, again demonstrating that cheap beats capability every time. ----------------------------------------------- The next one is labeled (in the foil) "ICS2110 Demo Board Rev. A" and sure enough there seems to be a square socketed chip labeled ICS2110 in there. An array of eight of what I'm guessing are RAM, some LSTTL, two 8-pole DIP switches, and four jumper blocks with one jumper on each. A TDA1545 ("Stereo Continuous Calibration DAC"), a couple of NE5532 op amp chips, a whole mess of capacitors, two trimpots (?) and two of what appear to be audio jacks at the metal bracket. This one's a 16-bit card. The last one is also a 16-bit card. On the metal brack is a 50-pin connector (same thing you'd see on an Adaptec 1520, 1540, etc.) and on the opposite end is a 4-pin "drive power" (like in any PC) connector for power to apparently be supplied_to_ the card, a small button ("tac" switch), and a 2x5 pin shrouded connector. And across the top of the card is a big 2.4 ohm 10W (!) power resistor, not the sort of thing I'm used to seeing on "PC" hardware. This one's all surface mount, and the one square chip in there is marked "Altera", not a name I'm at all familiar with. No other markings on the board except a sticker hiding under that big resistor with a barcode and a rather long number on it. ------------------------------------------------ Billy: I'm guessing on this one. The big resistor sounds like a current source for some sort of burner. Altera is a programmable logic company. I wonder if you have one of their early programmers? The programmers had two parts, the PCB and another box with ZIF sockets external to the PCB. The cables were about 24 inches long, but I remember them as plugged into Molex connectors. Can you get us some photos? Might bring back more accurate memories. -------------------------------------------------- Anybody know what these are, any of them?

18 years, 1 month

Need 8 Bit VGA for PC XT 5160

by mbbrutman-cctalk＠brutman.com

I have a beautiful 5160 XT with 512KB, 10MB hard disk, monochrome card and a 5151 display. To make the machine slightly more useful I'd like to find a VGA card that will run in an 8 bit slot. CGA would be more original, but I can't fit another monitor in the office. I can connect the XT to my 20" flat panels through their VGA connectors, which is perverse in a way but it will work ... That way I have room for the 5151 as well. If you have such a beast or can at least tell me what to look for I'd appreciate it. I read the list religiously, but replies that are not interesting to everybody else should go to me off-list. Mike http://www.brutman.com/PCjr PS: I've got a 3COM Etherlink II (3C503) and software ready to go .. this baby is going on IBM's internal network! :-)

18 years, 1 month

Floppy disk sizes ( was Re: Compaq Portable III fails POST? )

by aliensrcooluk＠yahoo.co.uk

--- Fred Cisin <cisin at xenosoft.com> wrote: > On Mon, 21 Aug 2006, Don wrote: > > I think 8.00 is the *last* that will fit on a 5" > floppy. > > 8.04 requires 3" floppies -- though I haven't > checked to see if > > 3.5" I used 3" drives with a Compaq, but eventual ly > switched to 3.5" > > Huh? 3" floppies too! That means there are 5 different floppy disk sizes that I now know of: 3" 3.5" 5" 8" 12" (used on a special Sony Laservision machine) Are there any more?? Regards, Andrew B aliensrcooluk at yahoo.co.uk

18 years, 1 month

Question about Z80 ISA bus board

by bob099＠centurytel.net

Date: Thu, 31 Aug 2006 18:06:30 >From: "Joe R." <rigdonj at cfl.rr.com> >Subject: Re: Question about Z80 ISA bus board >To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> >Message-ID: <3.0.6.16.20060831180630.0f97b98c at pop-server.cfl.rr.com> >Content-Type: text/plain; charset="us-ascii" > > I don't know about this particular board but several companies did build >Z-80 boards to fit into a PC an allow you to run CPM. I used to have one >made by Baby Blue or some such. > > Joe > > >At 08:16 PM 8/30/06 -0500, you wrote: > > >>Hope to generate less heat this time. >> >>Full length ISA card, XT card edge connection, DB 37 male connector, >>Z80B, 8 4164's, 2 2764's, 2 Mostek MK4801AN-4's, MC1420B, 10 MHZ >>crystal, and a handful of 74LSxxx glue chips. Only identification >>lettering is "BETRONIX = SWEDEN=PC84" >> >> >>Anyone have an ideal what it could be? Betronix made circuit board >>layout software. >> >> >> Looks like my choice is to dig up an ISA bus machine and plug it in and see what happens.

18 years, 1 month

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test-drb September 2006