test-drb May 2009

test-drb@ccmp.vtda.org

204 participants
322 discussions

Xerox 820 system disks in Teledisk format?

by ajp166＠bellatlantic.net

> >Subject: Re: Xerox 820 system disks in Teledisk format? > From: "bfranchuk at jetnet.ab.ca" <bfranchuk at jetnet.ab.ca> > Date: Thu, 07 May 2009 14:52:18 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: > >> >> You need to add Zilog Z280 to that list of split I&D space cpus. > >I was looking at the 1978 ... 1983 time line... > >> Allison >PS. I like the 6809 and OS/9... > Yes, in the 8bit world the 6809 is an impressive cpu. OS/9 I have no experience with those though I have a 6809 COCOIII and a homebrew 6809 running CUBIX. It's the closest thing I've used and programmed to a PDP11 that is not 68000 or 32 bits. Allison

17 years

Extracting a 8049 (ROM) program

by chrism3667＠yahoo.com

couldn't you *force* such a chip to yield up it's internal code by utilizing all of a keypad's functions? A combination of that and *watching* the outputs of pins upon startup. I have this thing in my head, I'm having, obviously, a bit of an awkward time putting it in print. Some sort of logic analyzer would be necessary, but even a home brewed job would seem to be in the trivial category by today's speeds. ?In Hacking the Xbox ,I believe (it's been a while) Bunnie Huang did something like this. The dude I obtained a stack of Tandy 2000s years ago said he had worked on a mod that would spy on interrupts as they were generated (via a pal chip) and revert to a different set of routines that would, according to him, make the 2000 completely pc compatible. He never finished. An extremely interesting premise though. --- On Wed, 5/6/09, John Robertson <jrr at flippers.com> wrote: From: John Robertson <jrr at flippers.com> Subject: Re: Extracting a 8049 (ROM) program To: General at invalid.domain, "On-Topic Posts Only" <cctech at classiccmp.org> Date: Wednesday, May 6, 2009, 1:39 PM Alexandre Souza wrote: > >? ? Dear friends, > >? ? Anyone has a clue of how to extract a 8049 program? > >? ? This is for a Kenwood TS-430 radio. It uses a 8049 for entire rig control, but got one fried. It would help a lot if I could extract a program from a known good TS-430 and program a 8749 with that. > >? ? Thanks >? ? Alexandre > > > The 8049 appears to have the same pinout as the 8041 and as such probably can be read on my Xeltek burner...I just don't have an 8049 to check... The 8041 ROM code is not protected and can be read with any Eprom Programmer that handles that series. My Xeltek SuperPro can handle that as can any other burner that shows the 8041 in its list of supported devices. John :-#)# -- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) ? ? ? ? ? ? ? ? www.flippers.com "Old pinballers never die, they just flip out"

17 years

PDP-11 taking over the world (was Re: Xerox 820 system disks in Teledisk format?)

by ethan.dicks＠gmail.com

On Thu, May 7, 2009 at 5:40 PM, Chuck Guzis <cclist at sydex.com> wrote: > On 7 May 2009 at 13:30, bfranchuk at jetnet.ab.ca wrote: > > >> For a alternate world ... Had the PDP 11 been reduced to a simple IC >> design and operation code set, DEC may have got the PC market. Ben. > > Didn't the Soviets have their own versions of the LSI 11 and even put > on in a calculator? Yep, and at least one handheld LCD-based "game", IIRC. Once they had the chip, it found its way into smaller and cheaper things. I was even in Russia 10 years ago, but didn't happen to run across any of that sort of gear where I was. >?I do know that they had "personal computers" built around the architecture. Yep. Also somewhat popular for the market. > But when the PeeCee came out, they happily went for the x86. Not right away, I think. Back in the early 1980s, even the home market in the US didn't leap right on the 5150. I was working at a childrens' game company in 1984 and we debated supporting the PC because the numbers weren't on our side yet to develop for that platform given our audience. There were plenty of PCs in offices, but the home penetration hadn't exceeded the installed base of Ataris and C-64s yet. In the end, we did support the PC, but it represented a minority of our sales. I'm sure 2-3 years later the numbers would have looked very different. -ethan

17 years

MC3418 CVSD Encoding (Was: Re: Looking for IBM PS/2 or PCjr SpeechAdapter Tech Ref

by julianskidmore＠yahoo.com

Michael B. Brutman wrote: > I understand the > principle behind CVSD encoding and decoding, but not enough to start > writing code. I want to write some code takes CVSD encoded data and > displays the waveform on a screen, for a sound editor. CVSD decoding is a simple algorithm, here's a version which works one bit at a time: typedef unsigned short ushort; typedef unsigned short bit; // should be a range 0..1. #define kCvsdMaxGain 8 #define kCvsdIntegrator 15 ushort gCvsdDecGain=1, gCvsdDecRefSample=32768; ushort gCvsdDecRecentBits=0xaaaa; ushort CvsdDec(bit aBit) { gCvsdDecRecentBits=(gCvsdDecRecentBits<<1)|aBit; gCvsdDecRefSample+= (aBit==1)? gCvsdDecGain:-gCvsdDecGain; if(((gCvsdDecRecentBits&kCvsdIntegrator)==kCvsdIntegrator) || ((gCvsdDecRecentBits&7)==0) ) { if(gCvsdDecGain<kCvsdMaxGain) gCvsdDecGain<<=1; } else kCvsdMaxGain=(kCvsdMaxGain+1)>>1; return gCvsdDecRefSample; } All you have to do is pick the right maximum gain and integrator. Somewhat wrong values will still produce something recognisable. -cheers from julz @P

17 years

Datex floppy drive emulator - flash based replacement for magnetic media

by john_a_s2004＠hotmail.com

Hi, I came across this product on the web: http://www.datexdsm.com/emulator/docs/DTX200en.html with a review here: http://www.storagenewsletter.com/news/disk/datastorage-floppy-disk-drive-em… This is exactly the device which has been often talked about on this forum - namely a solid state drop-in replacement for a floppy disk drive. I have no idea how well it works (and at only 450 euro each if you buy 2 or more am not likely to find out in a hurry). Some random questions: - anyone here involved with developing this product? - can it emulate a hard sector floppy? - how does it compare with SVD (semi virtual diskette)? Apologies if this has been discussed at length already, any pointers to the cctalk archive appreciated. Regards, John _________________________________________________________________ Share your photos with Windows Live Photos ? Free. http://clk.atdmt.com/UKM/go/134665338/direct/01/

17 years

Datex floppy drive emulator - flash based replacement for magnetic media

by amouses＠gmail.com

Regarding Datex. My initial elation at finally finding a drop in, commercially available solid state replacement floppy or MFM hard disk emulator, was like everybody else shorted out when I saw the prices. I have commented on this before in this forum. And, as before I'll comment that I maintain a listing of all such products. It is here: http://maben.homeip.net:8217/static/S100/DISK/index.html If you think the Datex floppy emulator is expensive, just ask for a quote on the MFM hard drive emulator :-( In summary, Datex claims to have a floppy and MFM hard disk emulator but due to reasons of cost I've never been able to contact anybody who actually had one. Many other Floppy disk and even some MFM hard drive emulators are out there as enthusiast builds, but are generally not available, or are not drop in replacements, or only support particular hardware e.g. Commodore Amiga. All ends up in a lot of frustration if you ask me! I am not sure which is more evil: posting up a device that does just what I want (but I can't buy), or one that I can buy (but I can't afford). regards marcus b.

17 years

driving a Kaypro CRT

by dgriffi＠cs.csubak.edu

I'm pondering gutting a Kaypro to put a P112 inside. This would necessarily require coming up with a way to drive a CRT. Has anyone here done such a thing? -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

17 years

FREE CP/M hardware,software,manuals in Southern California (OC)

by bpettitx＠comcast.net

Steve, I am coming down to Leguna Woods next weekend. We have a house there and need to clean it up some for resale. If nobody else claims them, I will bring everything back and have Al Kossaw scan the material for bitsavers. Billy Pettit

17 years

FREE CP/M hardware,software,manuals in Southern California (OC)

by tosteve＠yahoo.com

I have some old hardware, software, manuals to donate to whoever will pick them up ASAP. Some names: Morrow Design Zenith TeleVideo Fujitsu Kaypro II CP/M software,manuals Thanks- Steve in Aliso Viejo 92656

17 years

Panasonic PD LM-R650J

by jfoust＠threedee.com

At 06:23 PM 5/6/2009, Rich Alderson wrote: >Just out of curiosity, who's the manufacturer of the DVD-RAM drives used >in the first G4 Macintosh systems? My 9 year old drive works just fine, >if that helps at all. Matsushita LF-D211A in mine, date 10/2000. - John

17 years

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test-drb May 2009