test-drb July 2003

test-drb@ccmp.vtda.org

279 participants
450 discussions

by ernestls＠comcast.net

For long term storage, is it better to store a 5.25 inch floppy drive with a disk in the drive and the lever closed, or is it better to leave the door open and no disk in the drive? Either way, the drive will be in a sealed plastic bag to keep the dust out but I was just curious about whether or not to keep a diskette locked in the drive during storage. I've heard arguments for both. Thanks!

21 years, 5 months

Texas Insturments 1975-1979 computer research help needed please.

by nsa＠ureach.com

Hi Folks, I'm new to this group and didn't know I wasn't allow to post jpeg pictures. But anyway I have some new questions on TI computers. One what TI computer came out about 1975-1979 That had a large removable hard drive and was better than the DEC PDP's ? Which had very limted RAM and used slow magnetic tapes for programs and data storage ? Second what would be in this binder as the outside reads: TI-MIX Microcomputer Information Exchange ? The computer came out before 1979. My father wrote an OS for it. The last time he used it was 1979. Any help would be great. Thanks ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag

21 years, 5 months

FWD: FS: RARE black Bell & Howell Apple ][ Plus with drives

by ba600＠freenet.carleton.ca

> FS: RARE black Bell & Howell Apple ][ Plus with drives > > Selling an excellent condition black Bell & Howell Apple ][ Plus with > matching black drives. This is a genuine Apple computer, distributed > through Bell & Howell (has both companies logos on the nameplates of the > computer and disk drives). > > Asking $499.00 US or best offer. > > Please email me for more details at: > pmode4(a)mts.net -- Collector of Vintage Computers http://www.ncf.ca/~ba600/

21 years, 5 months

List shenanigans?

by vcf＠siconic.com

Is it just me or is the list dumping the same messages over and over again? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

21 years, 5 months

Simplest (practical) file system?

by mbg＠TheWorld.com

>When a file is deleted, its directory entry is changed to indicate that >the file no longer exists, If a shorter file is then stored on the disk, >then the directory entry is changed again for the new file. THis then >leaves some unused blocks on the disk which can't be used becuase there's >no way to create a directory entry in the right place in the directory. RT handles this by adding a directory entry to describe the unallocated portion of the previous free space. This might mean having to move directory entries in a segment, and may require a segment split. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: mbg at world.std.com | | Member of Technical Staff | megan at savaje.com | | SavaJe Technologies, Inc. | (s/ at /@/) | | 100 Apollo Drive | URL: http://world.std.com/~mbg/ | | Chelmsford, MA 01460 | "pdp-11 programmer - some assembler | | (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

21 years, 5 months

Differences in the Z80 processors?

by ernestls＠comcast.net

I have seen z80, z80a, and z80b processors, and I'm curious about what the differences are between the different versions of the processor? Is each newer version faster than the earlier model, like a 486-33/66/100 or are the differences more along the lines of additional commands (or something like that?) Or a combination of both? Also, can I use a Z80a or Z80b in place of the original Z80 if I want to replace a bad CPU? Thanks. E.

21 years, 5 months

Manx [was: Re: scanning booklets for archive]

by aek＠spies.com

Thanks for indexing all of this. A flat text file of all of the entries would be of use also. Do you know if this can be put on line? Someone was asking about it on alt.sys.pdp8 recently DEC-8I-H2CA-D PP8/I High-Speed Paper-Tape Punch Option Functional Description DEC-8I-H2DA-D PR8/I High-Speed Perforated Tape Reader and Control Option Functional Description DEC-8I-H8NA-D KT8/I Time-Sharing Option Functional Description DEC-8I-HOCA-D KE8/I Extended Arithmetic Element DEC-8I-HODA-D KB8/I General Input/Output Interface Option Description

21 years, 5 months

Pet 2001, (6550 unobtainium!) ??

by bdegnan＠degnanco.net

Hello - I read your text from... http://www.classiccmp.org/pipermail/cctalk/2003-January/014761.html I have a similar problem, the screen is full of characters, and I am trying to figure out what is the cause so that I can attempt to fix. I am going to try the 2114s from bgmicro.com as you mentioned. Any advice? It's a shame if I can't fix this thing, it's in nice cosmetic shape. Thanks in advance Bill Degnan Wilmington, DE

21 years, 5 months

Need Computer History Info Research Help 1965-1979 DEC pdp 8E

by nsa＠ureach.com

Hello folks, I have been trying to research and find out what certain computers and accessorys.I have wriiten below questions I have to the veries parts in the pictures in which I tring to figure out. I will be only sending out two of the pictures of these computers to start with. These computers where used in submarine dectection ASW. I'm trying to help the US Navy Historical Center out with info on the breakdown of the hardware. Any information would be of great help. Thanks ---------------------------------- Above where it reads FIELD-8E SYSTEMS 1 looks like some type of signal generator ? an analog output ring ? Are Some type of Data Transmitter that can send test signals for either teletypewriter or data communications. In the middle I would guess is a computer battery maybe ? And at the bottom you have a bunch of LCD lights there in the center above and also a lot of headphone jacks and looks like for each set of headphone jacks equals the amount of knobs to turn same in the center right headphone jacks to and up or down switch. Above MARKSMAN plotter-printer notice the numbers above Array recorder ? Center Above is duel Tape recorders Center Bottom is some type of Oscillator possible used as a computer monitor as then I guess that is what was used as computer monitor as today’s also use frequencies. The knobs on the oscillator would be used to see the frequency that the tape is recording from picking up the sound from the signal generator ? And at the bottom is the DEC PDP-8E Computer PDP-8E CPU with extended arithmetic element. KL8E 2400 baud communications port ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag [demime 1.01a removed an attachment of type image/jpeg] [demime 1.01a removed an attachment of type image/jpeg]

21 years, 5 months

RL02 Assistance...

by cvendel＠att.net

Hi, I've got an RL02 connected to my Vax 4000-200 through an RLV12 QBus controller. The Drive is spinning up fine and the Ready light is Lit, the Fault light goes off once power to the Vax is started and doing a SHO DEV at the Chevron prompt and within OpenVMS both show: RLV12 Controller 0 (774400) -DLA3 (RL02) Which looks great from my perspective, the drive ID plug is a 3, so DLA3 makes total sense. In the SHO DEV within OpenVMS does display the drive as being online. So my problem is with MOUNT, everytime I go to mount the drive the system simply hangs and never seems to complete the mount, I end up having to CTRL- BREAK to Halt the system back to Chevron and b up again from my DSSI DIA0: Anyone have any idea's what I'm doing wrong or what may be wrong??? I've tried with a /FOREIGN too since this platters are from an 11/730 and many of the handwritten labels on the disk paks say RSTS on them, so I wasn't sure if it was a format issue or something, I could really use some help/advice from anyone with a lot of experience with the quirks of the RL's. Thanks much, PS: If anyone has an RK05 or RK07 DECPack for sale and possibly an RKV11D Qbus controller I am in the market for one. Curt

21 years, 5 months

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test-drb July 2003