test-drb March 2000

test-drb@ccmp.vtda.org

150 participants
515 discussions

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by pete＠dunnington.u-net.com

On Mar 21, 23:04, Allison J Parent wrote: > <> Are these single voltage or multiple? 4k? 22pin? sounds like the > <> semi-4600 and NEC D410 parts, a 4k pseudostatic 200ns cycle and access > <> under 120ns. I've got a rat load of upd410s. The moto part number > <> doesn't compute though. > < > <uPD410 is 18-pin 0.3" width, 4k x 1, with one ~CE line (the MOS Technology > <MCS6550 has 2 ~CS and 2 CS lines and it's 0.4" wide). I can't find any > <data on a 4600 but I assume it's similar. > uPD410 .4" 22pin three voltage 4Kx1, seperate din and dout, CE and CS/ three > voltage pseudostatic. replaces Semi-4200 and 4402, fastest version to 80ns > access. (it was a screamer for 1978). Oops, I misread the data book -- you're right of course, uPD410 is .4" -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by allisonp＠world.std.com

<I don't really see how the fanout units on offer (or my unsuccessful <back-to-back device) could do that -- the termination isn't in the <transceiver or fanout unit, it's a resistor on the end of the cable. < Anyway, it would still only be one termination domain. Or maybe I've <misunderstood what you mean? If you mean my back-to-back transceiver idea <yes, if it had worked, you could use it to split a termination domain into <two, just like a two-port repeater, or a very simple bridge (except a <bridge usually separates collision domains too). Anyone ever heard of a DELNI? Ok, it was an 8 port AUI to AUI with a 9th for AUI to h4000 fat eithernet cable. Popular use was for cobbing 4-7 system together locally if you didn't have the BIG backbone. Logial equivilent of a 8 port hub used for 10bt. Allison

26 years

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by allisonp＠world.std.com

<Yes! I just repacked my lidless 4116 chips. I only ever got as far as <cementing slide-mount covers on one and sticking it in an Apple II at the <top of RAM and demonstrating the effect by clearing video RAM then lifting <the lid. Many bits sparkled in when light shone on the chip. Many years ago far away... A bunch of us took the lid off a NEC 4116 and focused an image on to one segment of the matrix and then used a apple as a raster box to play the bits to a matix on the screen. lousy res being 128x128ish and no gray scale but high contrast images under infared light really were discernable. Oh, refresh rate (read rate) was basically the "shutter speed" so really slow scans were quite sensitive. Allison

26 years

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by allisonp＠world.std.com

<> Are these single voltage or multiple? 4k? 22pin? sounds like the <> semi-4600 and NEC D410 parts, a 4k pseudostatic 200ns cycle and access <> under 120ns. I've got a rat load of upd410s. The moto part number <> doesn't compute though. < <uPD410 is 18-pin 0.3" width, 4k x 1, with one ~CE line (the MOS Technology <MCS6550 has 2 ~CS and 2 CS lines and it's 0.4" wide). I can't find any <data on a 4600 but I assume it's similar. Oh, you shouldn't ahve done that... ;) First off I worked for NEC Micro during 79-84 time frame... hawking memories, micros and peripherals (mostly I82xx parts) as a product engineer. uPD410 .4" 22pin three voltage 4Kx1, seperate din and dout, CE and CS/ three voltage pseudostatic. replaces Semi-4200 and 4402, fastest version to 80ns access. (it was a screamer for 1978). uPD411 .4" 22pin three voltage 4Kx1, seperate din and dout, CE and CS/ three voltage dynamic. replaces ti4060, intel 2107, fastest version to 200ns Tce access. same pinout as 410. FYI, altair 88-4MCD boards were so poor I pulled the TMS4060 static and used uPD410s to make them static, one cut to disable refresh. Very reliable after that! uPD 414, .3" 4kx1 dynamic upd 416 .3 16kx1 dynamic, industry standard 2101 .4 22pin static 256x4 (5101 is the cmos part) 2102 .3 16pin static seperate IO 1kx1 2111 .3 18 pin static common io 256x4 2114 .3 18 pin 1kx4 static, common io 2147 .3 18pin 4kx4 static, seperate IO 45ns 2149 .3 18 pin 1kx4 static common io (2114) 45ns 2167 .3 20 pin 16kx1 static, 55ns 4104 .3 18pin 4kx1 pseudo static seperate io CE/ (-5 85ns Tacc, 180ns Tcy) uPD421 .4 22pin 1kx8, same as two 2114s logically, (-5 85ns) 443/6508 .3 16 pin static CMOS 1kx1 444/6514 .3 18 pin static cmos 1kx4 (like 2114 in cmos) 445 .6 24pin static cmos 2kx8 with CE2 and CE1/ industry pintout 1 446 .6 24pin static cmos 2kx8 industry pinout 2 449 .6 24pin static cmos 2kx8 industry pinout 3 4016 .6 24 pin static cmos 2kx8 6116 pinout Most of those were industry standard with part numbering differnces. Be glad I didn't pull down my hard cover NEC catalogs. <If you're asking about the 6550 I'm looking for, yes it is single 5V rail, <but it's 1k x 4 and it's not Motorola. In fact, I'm fairly sure no-one bu <MOS Technology made them. If I knew pinout I could find an industry part that would work save for pinout or package. Allison

26 years

Apple Network Servers

by owad＠applefritter.com

>::If anybody wants more information, see >::<http://www.applefritter.com/prototypes/deepdish/>. > >Quite interesting. It looks like the ANS300 got its 604/200 from an ANS700. >Can I just rip the chip out of another unit and substitute it, or do I still >need the complete 200MHz board? I really couldn't tell you, but I'll forward you message along to Chuck Goolsbee, the owner, who might be able to help. >I'm also particulary impressed with the Spartan page on your site (for those >in the dark, this was a hardware add-on for the Commodore 64 that turned it >into an Apple II): I thought it was just a hardware emulator, but its feature >set was really greater than the sum of its parts. Fascinating! Thanks! Tom Owad ------------------------------Applefritter------------------------------ Apple Prototypes, Clones, & Hacks - The obscure, unusual, & exceptional. ---------------------<http://www.applefritter.com/>---------------------

26 years

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by pete＠dunnington.u-net.com

On Mar 21, 15:24, Jim Strickland wrote: > Couldn't they be used to divide a termination domain? IE the multiport > transceiver sits between two branches of a thin-net network, protecting against > loss of termination on either branch? Obviously they'd still be in the same > collision domain... I don't really see how the fanout units on offer (or my unsuccessful back-to-back device) could do that -- the termination isn't in the transceiver or fanout unit, it's a resistor on the end of the cable. Anyway, it would still only be one termination domain. Or maybe I've misunderstood what you mean? If you mean my back-to-back transceiver idea, yes, if it had worked, you could use it to split a termination domain into two, just like a two-port repeater, or a very simple bridge (except a bridge usually separates collision domains too). -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by whdawson＠mlynk.com

Thanks for the responses. It looks like all are spoken for. If I end up with any left, I'll repost them. Bill whdawson(a)mlynk.com

26 years

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by ethan_dicks＠yahoo.com

--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > On Mar 21, 21:48, Tony Duell wrote: > > > else, long before I posted my request. I could fix about anything > else on > > > the PET, but I draw the line at grinding the top off to poke at > individual > > > flip-flops in an IC :-) FWIW, the first job I had in > > > > Really, kids these days..... > > Well, I once ripped the metal lids off a few ceramic DRAMs to use them as > optical image sensors (ISTR an article in BYTE, I think it was, years ago > about that) Yes! I just repacked my lidless 4116 chips. I only ever got as far as cementing slide-mount covers on one and sticking it in an Apple II at the top of RAM and demonstrating the effect by clearing video RAM then lifting the lid. Many bits sparkled in when light shone on the chip. Now that I have a digital camera, I'll have to take pictures (as soon as I buy/find/make a Mac crossover cable to connect a QuickTake 150 to my Mac). -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years

Spartan emulator

by ethan_dicks＠yahoo.com

--- Mark Gregory <mgregory(a)vantageresearch.com> wrote: > I don't know how they got there, but I remember seeing a large pile of > these Spartans at Active Surplus, on Queen Street in Toronto (well-known to > any Hogtown hackers) in late '88 or '89. Given Active's inventory policy > ("If you don't buy it, we'll leave it lying around") they may still be > there. If anyone researches this, please let me know. > From: Cameron Kaiser <ckaiser(a)oa.ptloma.edu> > To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> > Date: Tuesday, March 21, 2000 4:48 PM > Subject: Re: Apple Network Servers > > > > I'm also particulary impressed with the Spartan page on your site (for > > those in the dark, this was a hardware add-on for the Commodore 64 that > > turned it into an Apple II): I was a beta tester for the Spartan in 1985. Somewhere I've still got my contract with them (all I could find on a casual search of my bookshelves is a copy of the docs). I have the case for one in the basement; I forget what happened to the mainboard. I think it died, or else I wouldn't have stripped the supply for another project. During my testing, I remember running Enchanter on the Apple CPU and Sorcerer on the C-64 CPU, typing a command on one, switching to the other and typing a command there to multi-task the games (since the disks were so slow). Interesting concept, but about 50% the cost of a real Apple. If they ever sold any, it would have been to some serious die-hards. Mostly back then, Apple guys and Commodore guys didn't mix much. Kinda like Atari guys and everybody else. :-) -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years

3com 3server3

by mmcfadden＠cmh.edu

I just came across a wierd computer box. It is labeled 3com 3server3 and has a dc-300 cartridge tape drive it it. I haven't opened the box yet. I looked on the 3com website and it says that it is a PC server from 1984. Does anyone know anything more? TIA Mike michaelmcfadden(a)sprintmail.com

26 years

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test-drb March 2000