test-drb December 2015

test-drb@ccmp.vtda.org

191 participants
268 discussions

Apple IIe Platinum key mechanism replacement

by terry＠webweavers.co.nz

Making my junk look less like junk. Nothing groundbreaking for the engineers in this group but may be of interest to those voyeurs/nostalgerists that like looking at close-ups of the keycaps...or not... http://www.classic-computers.org.nz/blog/2015-12-27-appleiIIe-plantinum-key… Terry (Tez)

8 years, 4 months

Looking for 3COM 3C905-TX Drivers

by marc.verdiell＠gmail.com

You need OSR2, and even then it's hard to get Win95 OSR2 to work reliably with TCP/IP. You'll first need to add the TCP/IP client for Microsoft Networks protocol, as it's not even installed by default (darn Microsoft!). By default it has only NetBUI and Netware, which must have paid them money... I could browse the web, but not get file sharing working. In the end I switched to Win98 SE and it was a lot smoother on the networking side. Marc >From: "Robert Jarratt" <robert.jarratt at ntlworld.com> >The drivers from the HP Enterprise site worked, although for >Windows 95 I have been unable to get TCP/IP working. DHCP is not working and >ping moans about a wrong protocol. It looks like I am missing VUDP.386 and I >could not find it on the Windows 95 CD. I am pretty sure I have another CD >with OSR2 somewhere, but I can't find it at the moment. Will have another >look at some point, but I think the driver itself is just fine now. >Regards >Rob

8 years, 4 months

Old VCF East/West videos are going online

by cctalk＠snarc.net

Good news! A bunch of old VCF East/West videos are going onto YouTube, thanks to ANTIC / Atari Podcast's Kevin Savetz stepping forward to do the grunt work. The first batch are talks from VCF East 6.0 (2009). YouTube playlist is at https://t.co/yYRr7rP7R4. We also asked Jason Scott to bring the videos into Archive.org as they go online.

8 years, 4 months

Looking for 3COM 3C905-TX Drivers

by marc.verdiell＠gmail.com

>From: "Robert Jarratt" <robert.jarratt at ntlworld.com> >Does anyone happen to have drivers for this card? I am not sure what OSs >this card was supported on, so any drivers at all would be appreciated. I have a few versions of the drivers. They are part of Windows 98SE and Windows XP distribution though, I had the card recognized on its own on by both of these (and I suspect NT too though I didn't try). Needs more help on Windows 95. If you can't get it to work from the links send me an email. Which reminds me I should ask for some drivers too... Marc

8 years, 4 months

IBM channel-attached DASD emulation

by h.j.stegeman＠hccnet.nl

Hi Mike, Here are the options to attach 3340 DASD emulation to an IBM System/3 1) direct connect to the internal channel of the S/3. Some disk OEM's did this. Requires a FPGA with at one side MST-1 interface logic and at the other side IDE or SCSI interface. The availabe IBM documentation is complete enough to finish this project. You need good IBM HW & VHDL knowledge. 2) direct connect to the BUS/TAG interface connector. This needs a 8+P bit stream. You have to do some reverse engineering to figure out what the exact format is. I have no idea if the HW must be implemented in a FPGA (for timing reasons) or if an AVR processor will do the job. Advantage is that you don't have to modify anything inside the S/3. 3) IBM has implemented an IOP (I/O Processor) between the S/3 CPU and the 3340 drives. This IOP is a modified version of the ones used in the IBM 370/115 & 125. It is a powerfull multi thread capable beast. With small HW modification you can connect an IDE or SCSI drives to it. The difficult part is modifying the firmware of the IOP. This requires a special assembler (to be written) and very good assembler skill's. All options requires quite alot of time to implement. My 2 cents Henk

8 years, 4 months

IBM channel-attached DASD emulation

by tmfdmike＠gmail.com

I've recently been poking about with various bits of emulation with hardware interfaces... Dave's MFM emulator; various SCSI-to-USB or SCSI-to-SDcard devices; my Setasi RP12 Massbus disk emulator; the Sigma Seven Lisa widget/ProFile emulator etc. What about IBM channel-attached DASD? There are various CPUs lying around in private collections and museums - System/360s; System/370s; System/3 Model 15s; all used channel-attached DASD: and working reliable disks are much rarer than the damn CPUs! Questions: 1. There are or were various 3rd party companies producing rather obscure emulated DASD replacement subsystems - Virtualblue and Bustech are two names that come to mind. Has anyone looked into the possibility of using them to emulate older devices that would be usable on the above vintage CPUs? 2. To those with hardware design experience: how big a task do you reckon it would be to do this as a home-brew with modern hardware - exactly as Dave did with his MFM emulator? Is it feasible? Do the entire thing in software - Pi or Arduino or FPGA - with appropriate driver electronics to drive a channel interface? I've BCC'd some experts with experience - Rich Alderson; William Donzelli; Henk Stegeman - in the hope that they'll be able to contribute. What do people reckon would be the best target for emulation? 3340 springs to mind initially... would that work on machines as old as System/360s? It's about the *only* option for 5415 DASD... (To digress briefly - a modern reimplementation of something like the Setasi Massbus disk emulator would also be very useful; Rich - weren't LCM working on something like that?) Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

8 years, 4 months

Seasons greetings

by c.murray.mccullough＠gmail.com

To all readers/followers of this website - for those who love classic/vintage computers - I want to wish all the best of the holiday season no matter what your beliefs. In this day of political correctness it is simply to acknowledge Mother Nature's transition >from fall to winter and we should take time from our busy schedules to reflect on this 'special' time of the year. Happy computing! Murray :)

8 years, 4 months

VAX 4000-500 PSU Overload?

by robert.jarratt＠ntlworld.com

My VAX4000-500 will no longer power up, with the PSU starting up and then immediately shutting down. I suspect a possible short somewhere. I have measured the resistance of the load presented to the PSU by connecting probes to the backplane sockets used to power the machine. The odd one is the 5V load. With all the boards in and drives inserted I measure a resistance of about 4R. As I pulled out boards, drives and fans, it gradually crept up to 6R. So with nothing connected to the backplane I get a 6R load across the 5V supply. To my inexperienced mind, that seems a bit low. Should I expect such a value, or should I be dismantling the box to investigate possible shorts or failed components on the backplane? Additionally, the 12V side seems to be charging a capacitor as the resistance slowly climbs to about 130K. Is that reasonable? Again, nothing but the backplane. The 3.3 and -12V show very high resistance at all times. Thanks Rob

8 years, 4 months

Looking for WinXP drivers for Trident Video Cyber9520

by marc.verdiell＠gmail.com

In the series "looking for drivers". I have taken to using DolchPac 65's as my retro workhorses so I can multi-boot DOS, Win98 , WinNT, WinXP and Linux while sticking weird old PCI and ISA interface cards in it. One of the OS always ends up having some software for the card. It has a custom video card that identifies itself as a "Trident Video Accelerator 3D Cyber9520". I found the driver for Win98 which works very well, the machine came pre-installed running NT, and Linux installs a driver that is a bit glitchy but usable (I can't believe I could run modern Linux on this!). The video is auto-recognized and the right driver installs under XP, but the default version is ultra-buggy, video gets corrupted. Does anyone have an updated driver for this chip? Internet didn't come up with anything apart from the ones necessitating scary hardware scanners that crashed my old machine anyhow. Marc

8 years, 4 months

Merry Christmas

by jwest＠classiccmp.org

Just wanted to say a very sincere Thank You to all the talented folks that hang out here and call this place home, and also to wish you and yours a Merry Christmas. Best, Jay West jwest at classiccmp.org

8 years, 4 months

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test-drb December 2015