test-drb March 2019

test-drb@ccmp.vtda.org

136 participants
102 discussions

Need some Sun VME boards... (and if someone has a power supply...)

by earl＠baugh.org

Folks, I have been able to get the Sun 3/110 to boot using the SCSI2SD board as I had asked about earlier (if you want to see the details of what I did, I posted to the sun-rescue list...) However, I can't seem to get more that 4mb to work in the 3/110 chassis ( the 2nd chassis I have is 240v, and so far that doesn't look like it's switchable for use in 115v land...) I've tried the two 4mb boards I have ( both 501-1132 boards ) one has a gouge in the ground plane but the bulk of the ground plane is intact and one says Parity Error 3/17/16 ( not my writing, from the person I got it from ) so I'm assuming that would work but generate an error, similar to Clearpoint board I have that I can't figure out jumpers for. However I can't get the machine to even boot with the boards in. In both cases the lights on the CPU board all light up. Which indicates some form of reset. I've checked the boards dip switches. They are set according to the FEH as 3 on U3118 and 4 on U3119. Jumper J3102 is jumped as well. I've tried them with the VME Bus Px03 and Px04 both jumpered and unjumpered. Same results in all cases. I don't think it's a power issue, as the machine boots with 3 cards ( I.e. 8mb incompatible sun board or Clearpoint SNXRAM card, with SCSI card in both cases ). I've tried with and without SCSI card. All same results. Soooo, question is, do I just have two bad 4mb cards? Am I missing some setting? I don't see anything to set on CPU board. If so anybody got memory cards they're willing to trade that would work in a 3/110? I've got an 8mb 501-1102 or a 32mb 501-1254 32 mb card to trade, memory wise. I am trying to build up 2 3/110 machines, so would like 2 4mb boards at least. I've also got a 3/110 cpu board that has a blown cap to replace but otherwise works, and a couple SMD drive controller boards. I also just realized I have a a Sun 2 VME SCSI board - ( 501-1149 * combo: 501-1045 "Sun-2" SCSI in 270-1059 6U/9U VME ) And of course if anybody has a spare 3/1xx power supply that is configured for 115v also be interested in that. ( and another SCSI card with an external connection would be useful ) Earl

5 years, 8 months

AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

by guykd＠optusnet.com.au

Ok. Those are quite small. So you have one? Or those are not yours? If you have one, and a way to accurately measure it, making more will be easy for anyone with a lathe. I could do it, but surely you can find a machinist closer to home? Guy At 01:03 PM 10/11/2018 +0000, Riesen Thomas wrote: >Guy, >I am looking for small motor pulley ... see pic ... >Regards >Thomas > >-----Urspr?ngliche Nachricht----- >Von: Guy Dunphy [mailto:guykd at optusnet.com.au] >Gesendet: Samstag, 10. November 2018 13:25 >An: Riesen Thomas <thomas.riesen at predata.ch>; General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> >Betreff: Re: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B > >At 12:03 PM 10/11/2018 +0000, you wrote: >>Hi all >> >>Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive >>Mitsubishi M2894-63B? >> >>If there also the appropriate ribbon gummies available, I would be very >>happy. >> >>Regards >>Thomas > > >Do you know what they look like, and the dimensions? >Because I have these. http://everist.org/pics/misc/IMG_1655_pulley_800.jpg > >_Maybe_ they were off Mitsubishi drives, not sure. Had them in a box of floppy drive related bits for a loooong time, and have no recollection of where they came from. >These are 49.0 mm OD, hole 4.7 mm dia. And this is Australia, with 50Hz mains. > >Guy > > >Attachment Converted: "f:\email\attach\Pully_8Zoll_02.jpg" > >Attachment Converted: "f:\email\attach\Pully_8Zoll_01.jpg" >

5 years, 8 months

Computervision CADDS distribution carts are weird

by aek＠bitsavers.org

I ran into an interesting problem. Eric Smith's copytape program assumes two tape marks in a row is logical end of tape and stops reading. I've had problems with this before with MPE store tapes, because they put two file marks at the start of tape so I just keep reading until I get 10 errors in a row. That also lets me read anything after a logical EOT on 1/2" tape. Well.. CV is even weirder. One some CV software distribution carts EVERY file has two file marks between them. I don't expect anyone to have to archive any of these, but I wanted to get this written down somewhere.

5 years, 8 months

What 6502 macro assembler was used for the AIM-65 Monitor ROM?

by glen.slick＠gmail.com

Anyone know what 6502 macro assembler was used for the AIM-65 Monitor ROM, as shown in the AIM-65 Monitor Program Listing manual, document number 29650N36L ? Some of it's identifying features are using .BYT and .WOR (or .WORD) directives for declaring data, and .MACRO and .ENDM directives for declaring macros. Use of the macro directives can be seen in the RM65-5101 Floppy Disk Controller (FDC) Module User's Manual, document number 29801N02 There are countless 6502 assemblers available now, the exercise here is to identify the macro assembler that was used at the time. If it is available to run now the goal would be to run it to assemble source code exactly in the format that it used and produce identical listing output. (Modifying the source code to be accepted by a different assembler to produce identical binary output is not the goal of the exercise).

5 years, 8 months

50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

by thomas.riesen＠predata.ch

Hi all Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive Mitsubishi M2894-63B? If there also the appropriate ribbon gummies available, I would be very happy. Regards Thomas

5 years, 8 months

eBay: CDC 6600 modules

by jnc＠mercury.lcs.mit.edu

So, if anyone wants a CDC 6600 module for their mantle/shelf/etc, here: https://www.ebay.com/itm/283426116822 is someone selling some for a non-ridiculous amount of money (the latter being common with this type of thing). No connection with the seller, other than buying one myself. Noel

5 years, 8 months

Craigslist: RP05 drive cable in Indiana

by silent700＠gmail.com

No affiliation with the seller, just a strange item to come across randomly. Digital BC06S cable, which is mentioned in the manual for the RP05 and possibly others: https://chicago.craigslist.org/nwi/ele/d/multi-pin-digital-cable/6835150645… The ad shows updated two days ago so they likely still have it. J

5 years, 8 months

PDP-8 signed overflow detection

by kylevowen＠gmail.com

What is the shortest subroutine on a PDP-8 which will add two variables in RAM and return the saturated sum (that is, returning 2047 or -2048 upon overflow, otherwise the sum) in the accumulator? Kyle

5 years, 9 months

Epson PX8 disk emulator

by wrcooke＠wrcooke.net

Hello all, I have built an emulator that uses an Arduino and SD card to provide four "floppy drives" for an Epson PX8.? It may also be usable with a PX4, but I have no way of trying it. If you would like to build one yourself, or just read about it, the details are here:?http://wrcooke.net/projects/pfbdk/pfbdk.html Any feedback is appreciated (I already know the page is crummy.)? Especially if you build it I would like to know good or bad experience. Thanks, Will "He may look dumb but that's just a disguise."? -- Charlie Daniels "The names of global variables should start with? ? // "? --?https://isocpp.org

5 years, 9 months

Matching paint on DEC monitors, cases and cabinets

by abacos_98＠yahoo.com

Has anyone ever found a source for aerosol spray cans that are a close matchto the colors that DEC used on their cases and such? I remember seeing touch up colors mentioned in the past. Specifically the ivory/almond colorof VT100's, DECservers, etc. Brian

5 years, 9 months

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test-drb March 2019