test-drb October 2004

test-drb@ccmp.vtda.org

245 participants
540 discussions

by melamy＠earthlink.net

I thought that the SD controller board set was also bit slice (the series II internal was of course 8271 based). They handled the same comands at a different I/O location. The only format difference between SD and DD was the DD was proprietary of course and had 52 sectors instead of 26. That made the OS software easy to handle either density rather than creating blocking schemes that CP/M did which would require more software handling. Intel kept ISIS low in memory and had a program load address that did not let you make the OS any bigger than when ISIS first came out. The advantage was that as long as you had 32K of memmory you could run any Intel software and putting 30K more of memory in the system was immediately available (unlike cp/m). The floppy interface for the bit slice was pretty well abstracted in that the cpu wrote commands to I/O ports and the data off disk was dma'd to and from memory. You told it what to do, where to put it, and how much to data. The cpu didn't have to do anything else except wait for completion of the operation. -----Original Message----- From: "Joe R." <rigdonj(a)cfl.rr.com> Sent: Oct 30, 2004 10:20 AM To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> Subject: Re: new find: an Intel MDS 800 That's interesting. I've never even heard of a white MDS-800 before. Was it painted white originally or was it painted over an orginal blue one? I think you need a lot more than rewriting the BIOS to handle DD disks. Intels DD controller has a 3000 series bit-slice CPU and some other odd circuitry to handle DD. Joe

21 years, 2 months

access to BIOS of DECpc

by GOOI＠oce.nl

Hi Megan, >from the mails I've got it is clear that the DECpc 320p supports just a few hard disk types and these are "hard-coded" in the BIOS. Worse: even the utility to access the BIOS does not support any change of the few known hard disk types. A few days ago was a good explanation of how a Disk Manager works, and that's what I did. You need a floppy to boot (MS)DOS and the OnTrack Disk Manager of the hard disk manufacturer or the OnTrack version that accepts any brand. The first one for a specific disk manufacturer can be found on various sites, the latter one must be bought. Step 1. install the new hard disk (*any* storage size, as long as the disk fits physically :-) Step 2. have an *empty* floppy available. Skip if you're always lucky... Step 3. boot to DOS from the boot floppy. Step 4. start Disk Manager (DM.EXE) from the OnTrack floppy. DM detects the disk geometry and presents something else to the BIOS so that the BIOS can work with the disk. Without OnTrack the BIOS does not know how to read the disk, so better make a bootable copy on the floppy mentioned in step 2 when OnTrack asks if you'd like to do that! - Henk, PA8PDP. -----Original Message----- From: cctalk-bounces(a)classiccmp.org To: General Discussion: On-Topic Posts Only Sent: 30-10-2004 8:16 Subject: RE: access to BIOS of DECpc >I feel a bit silly, but it was late last night is my excuse. >"DECpc 320P" in Google gave a link to floppy images on a COMPAQ site. >I will try them this evening, but it is good to know that the DECpc >"knows" a limited number of hard disks. If I can 'upgrade' to some >300 Mb of the 420 Mb capacity it is still better than the 40 Mb that >I have available at this point. Years ago, I found out what I thought to be sufficient info to upgrade my 320P from the 40mb drive it had, to a 120mb I had been able to obtain... apparently type 46 and type 47 in the BIOS are user definable. And I guess I didn't have all the info, or I touched the wrong area because I essentially 'bricked' my 320p. It no longer boots. If you do find out how to do it reliably, I'd be interested in trying to fix it. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL,ST| 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 01824 | "pdp-11 programmer - some assembler | | (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

21 years, 2 months

What is this Data IO Thingie?

by jeff.kaneko＠juno.com

Photo at: http://home.earthlink.net/~pkaneko/data_io_stuff.jpg Andybody need/want this? The socket adaptors are: 715-1039 715-1028-1 715-1035-2 The fourth plug-in says that it is a calibrator program adaptor . . . . Jeff

21 years, 2 months

Need 20Mb Bernoulli disks

by rigdonj＠cfl.rr.com

Does anybody have any of the old "Beta 20" 5 1/4" 20Mb Bernoulli disks that they're willing to part with? I picked up a Bering HP-IB drive that I'd like to test. Joe

21 years, 2 months

access to BIOS of DECpc

by mbg＠TheWorld.com

>I feel a bit silly, but it was late last night is my excuse. >"DECpc 320P" in Google gave a link to floppy images on a COMPAQ site. >I will try them this evening, but it is good to know that the DECpc >"knows" a limited number of hard disks. If I can 'upgrade' to some >300 Mb of the 420 Mb capacity it is still better than the 40 Mb that >I have available at this point. Years ago, I found out what I thought to be sufficient info to upgrade my 320P from the 40mb drive it had, to a 120mb I had been able to obtain... apparently type 46 and type 47 in the BIOS are user definable. And I guess I didn't have all the info, or I touched the wrong area because I essentially 'bricked' my 320p. It no longer boots. If you do find out how to do it reliably, I'd be interested in trying to fix it. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL,ST| 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 01824 | "pdp-11 programmer - some assembler | | (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

21 years, 2 months

OT: Help ID old IBM electric typewriter

by aek＠spies.com

It is a Model C http://www.etypewriters.com/c-thumb.htm

21 years, 2 months

VCF stuff for sale

by dwight.elvey＠amd.com

Hi Marvin If you come across one of the small serial cards, I'm looking for one for my Poly88. It doesn't need parts, just the board would be great. Have you been able to get a Poly 88xx system up and running yet? If not, you should still bring a controller card, cables and drives for the 8 inch setup. I think I have the 5-1/4" setup covered. I'll blow some ROMs with the updates to handle the 8 inch drives. I'll be heading out soon and won't be on the net again until Monday. Dwight >From: "Marvin Johnston" <marvin(a)rain.org> > > >With VCF comming up in about 8 days, I am planning on bringing a bunch >of stuff up there to get rid, er, sell :). In that vein, is there >anything special those of you who will be attending are looking for? My >plan is to reduce my collection to things that are primarily in the 70's >to very early 80's, and I will mostly concentrate on CP/M and S-100 >systems. > >Things I have that are not in my area of interest or expertise include: > >SparcStatation2 w/ external CD-ROM, Color Monitor, Keyboard, Mouse, >Working >Wang computer (don't remember model), about 10"w x 24"h x 30"d., >untested >Xerox computer, Model 8???, w/ monitor/keyboard. About the same size as >the Wang, untested >Phillips computer, about 24"w x 24"h x 30"d w/ 8" drive(s), untested > >Make a reasonable offer, but I won't be bringing the above stuff unless >someone wants it! > >As usual, I'll post a link to the list of stuff that I'll be bringing >up. >

21 years, 2 months

Wilson SX 530 SMD TTL Based Disk Drive Exerciser Tester (ebay)

by stephane.tsacas＠gmail.com

Wilson SX 530 SMD TTL Based Disk Drive Exerciser Tester http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=45045&item=3849289730 Stephane

21 years, 2 months

ClassicCmp.org Down?

by marvin＠rain.org

Is http://www.classiccmp.org/ down? I've been trying to log into the web site since last night, and can't connect. I seem to recall that there was a problem with the HD, but I don't recall the actual server being down. BTW, being on digest mode, I won't see any responses unless I log into the site, get an email, or wait until the digest gets processed and sent out.

21 years, 2 months

Microsoft Windows vs. IBM 701

by tomj＠wps.com

---------- Forwarded message ---------- From: David Forbes I was reading that 1961 BRL survey, and found the user reports of the IBM 701 fascinating. They apparently had an average uptime of about 2-4 hours. That doesn't seem like much by today's standards, but then how often does Windows crash on you? The amazing thing is how much they paid per calculation. $50,000 rental per month for a typical installation at 500 multiplies per second is about 10,000 multiplies per dollar! We seem to get a better price these days with a typical PC. It's about a trillion multiplies per dollar, which is a factor of 100 million better. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/

21 years, 2 months

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test-drb October 2004