View Profile: JonB - Vintage Computer Forum

June 24th, 2017, 11:12 PM

JonB replied to a thread Found a rare Novell Data Systems "Nexus I" computer. Need help with diagnosis. in CP/M and MP/M

It's neat isn't it? I expected the logic boards to be in the drive box.. Can you run it with boards removed? Reason I ask is you will want to use...

11 replies | 325 view(s)

June 23rd, 2017, 12:57 AM

JonB replied to a thread Amstrad PCW8512 and gotek floppy emulators - is it possible ? in CP/M and MP/M

Which byte, what value? Sounds like a useful hack to me, Chuck :)

7 replies | 173 view(s)

June 22nd, 2017, 11:16 PM

JonB replied to a thread Found a rare Novell Data Systems "Nexus I" computer. Need help with diagnosis. in CP/M and MP/M

Nice find! Two things spring to mind. Bad memory - if you have access to an ICE, connect it to the main CPU and run a memory test. A problem...

11 replies | 325 view(s)

June 22nd, 2017, 11:07 PM

JonB replied to a thread Amstrad PCW8512 and gotek floppy emulators - is it possible ? in CP/M and MP/M

One more piece of advice: If you connect a drive to the PCW and you are using its power supply connector, beware. Amstrad have the +5v and +12v power...

7 replies | 173 view(s)

June 22nd, 2017, 08:52 AM

JonB replied to a thread Amstrad PCW8512 and gotek floppy emulators - is it possible ? in CP/M and MP/M

Yes, you can run emulators, but you need an adapter. Also, there's this IDE interface which I designed, which makes the floppy question a bit moot...

7 replies | 173 view(s)

June 22nd, 2017, 03:00 AM

JonB replied to a thread Looking for a DS DD (360k) full height Tandon 5.25" drive in black in Vintage Computer Items Wanted

It is definitely a double sided TM 100, Chuck. I can see "Tandon" cast into the aluminium chassis, but the model sticker seems to have fallen off...

3 replies | 158 view(s)

June 21st, 2017, 05:42 AM

JonB replied to a thread Tandon TM100 motor off modification in CP/M and MP/M

Well, first off, Larry, good spot on R11. I couldn't find it in the schematic (not looking hard enough, obviously), so I used Jonathan Platt's...

7 replies | 224 view(s)

June 20th, 2017, 06:53 AM

JonB replied to a thread Tandon TM100 motor off modification in CP/M and MP/M

Oh sorry, forgot to say: Big thanks to Larry for sending me the schematics! :)

7 replies | 224 view(s)

June 20th, 2017, 05:14 AM

JonB started a thread Looking for a DS DD (360k) full height Tandon 5.25" drive in black in Vintage Computer Items Wanted

Hi I am looking for a DS DD (360k) full height Tandon 5.25" drive in black for my Superbrain. These came with dual drives originally, but mine had...

3 replies | 158 view(s)

June 20th, 2017, 05:10 AM

JonB replied to a thread FS: 5.25" Floppy drives in Vintage Computer Items For Sale or Trade

I'm looking for a DS DD Tandon full height drive in black for a Superbrain. Please PM me if you find any more.

22 replies | 1576 view(s)

June 20th, 2017, 05:07 AM

JonB replied to a thread S u p e r b r a i n in CP/M and MP/M

I completed the "motor off" modification for Drive A so it stops spinning when not active, fitted a quiet fan (not that quiet actually - I'll have to...

25 replies | 1914 view(s)

June 19th, 2017, 10:46 PM

JonB replied to a thread Tandon TM100 motor off modification in CP/M and MP/M

Good news! My drive isn't damaged after all. I'm not sure what happened, but this morning I switched it on and all is well. (Edit: the 5v line...

7 replies | 224 view(s)

June 19th, 2017, 12:14 PM

JonB replied to a thread Tandon TM100 motor off modification in CP/M and MP/M

Hi Larry Where can I get the schematic? I restored the jumper settings after attempting the Intertevh trick and the drive seems to have died. I...

7 replies | 224 view(s)

June 19th, 2017, 06:52 AM

JonB started a thread Tandon TM100 motor off modification in CP/M and MP/M

Hi I need some expert advice! I've just tried to implement a motor off mod for the Tandon TM100 drive in my Superbrain. The modification is as...

7 replies | 224 view(s)

June 18th, 2017, 11:25 PM

JonB replied to a thread ZSID on the Superbrain in CP/M and MP/M

Found a patch on Gaby's site to change RST 7 to RST 6 in SID 1.4. It's used for the Amstrad PCW machines which, like the Superbrain, are using RST7...

8 replies | 192 view(s)

June 18th, 2017, 11:03 PM

JonB replied to a thread ZSID on the Superbrain in CP/M and MP/M

As I thought. There's a jump at 38h so RST38 is already in use (checked it with a small BASIC proggie). I'll have to hunt around to see if there...

8 replies | 192 view(s)

June 16th, 2017, 11:37 PM

JonB started a thread ZSID on the Superbrain in CP/M and MP/M

Superbrain threads are like buses round here. You wait ages for one, then ten come along at the same time. :D Anyway.. today I tried to run ZSID...

8 replies | 192 view(s)

June 14th, 2017, 07:23 AM

JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M

OK, now my Superbrain is working properly, it's time to get this party started - proper, like. :bigparty: Trial fitting uIDE-8 to the...

5 replies | 429 view(s)

June 14th, 2017, 07:10 AM

JonB replied to a thread S u p e r b r a i n in CP/M and MP/M

After a humongous effort, documented here and here, the Superbrain is working properly! Quite a few parts were replaced during this repair:- ...

25 replies | 1914 view(s)

June 12th, 2017, 10:55 PM

JonB replied to a thread Needed - a good .TD0, or .IMD Image for Superbrain QD - DSDD 48 tpi 5.25" in CP/M and MP/M

Quick update on the Maslin Superbrain disk images that I got from Larry (he'd extracted all the files and checked them for me and StephenM). Most of...

11 replies | 511 view(s)

June 8th, 2017, 05:16 AM

JonB replied to a thread Superbrain ACT boot code in CP/M and MP/M

OK, maybe I should start a new thread for this, but here goes. I discovered that I'd wired the ACT interface wrong when I reassembled the...

4 replies | 340 view(s)

June 7th, 2017, 06:06 AM

JonB replied to a thread Superbrain diagnostic disk? in CP/M and MP/M

I'm trying to work out what the RAMTEST program is trying to tell me when it is running. The instructions are clear enough - when it finds a RAM...

3 replies | 171 view(s)

June 6th, 2017, 03:21 AM

JonB replied to a thread Superbrain diagnostic disk? in CP/M and MP/M

Thanks Larry! The 64KTEST program was on one of the few boot images that work and I ran it. No problems. RAMTEST.COM checks the main memory as...

3 replies | 171 view(s)

June 5th, 2017, 10:54 PM

JonB started a thread Superbrain diagnostic disk? in CP/M and MP/M

Hi Does anyone have an image of the Superbrain diagnostic disk? This disk has the official name "Diagnostic diskette DA1" and contains at least...

3 replies | 171 view(s)

May 31st, 2017, 08:36 AM

JonB replied to a thread Superbrain KR3600 adapter boards in CP/M and MP/M

v3.0 of the keyboard map. This one works properly - due to the KR3600-PRO having its output lines back to front and me not spotting it, the carrier...

3 replies | 237 view(s)

May 31st, 2017, 12:25 AM

JonB replied to a thread Suberbrain owners: Run this program for me... in CP/M and MP/M

Thanks Stephen, I have updated the ROM and uploaded a new zip file. ** Untested until I get the carrier boards back from OSH Park ***

10 replies | 435 view(s)

May 31st, 2017, 12:18 AM

JonB replied to a thread Superbrain KR3600 adapter boards in CP/M and MP/M

With help from stephenm, I have the codes for the special keys. Also, corrected a few errors in the control codes - they are all supported now. ...

3 replies | 237 view(s)

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