Search found 881 matches

by Kazzie
Wed Sep 18, 2019 6:44 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

Yes, I now have the equipment to do so, but that will have to wait for another day (it's my birthday and if I spend any more time on it I will start to annoy my family!). Thanks for all the help so far, I shall be back with more questions when I get a chance to open the machine up to check the trac...
by Kazzie
Wed Sep 18, 2019 6:33 pm
Forum: hardware
Topic: A3000 battery damage repair.
Replies: 26
Views: 858

Re: A3000 battery damage repair.

IO Controller, IC13: A look at the datasheet for the IOC shows that pins 33-40 are active-low IRQ interrupts, 30-31 are active-high Fast IRQ interrupts, and 32 is an active-low Fast IRQ interrupt. As for pins 41 and 42, however, they are edge-triggered: falling-edge active IRQ input and rising-edge ...
by Kazzie
Wed Sep 18, 2019 4:24 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

Hi Kazzie, Yes, I've done all these things, with the same result. I can just about make out that whenever I type a command at the Supervisor prompt, whether it be desktop, help or modules, I get a 'file not found' error. Perhaps I should try reseating the ROMs? It's a nice quick try, so by all mean...
by Kazzie
Wed Sep 18, 2019 4:20 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

I can see a line appears, but its unreadable. Tried an old lcd screen but got nothing on it, even pressing the power on setting options. So the floppy codes come up as follows: CMOS unreadable PC-style IO world detected Long memory test performed Self-test due to power-on And thats all I got at the...
by Kazzie
Wed Sep 18, 2019 2:27 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

Even with patchy video, typing "desktop" and pressing enter might show some recognisable activity.
by Kazzie
Wed Sep 18, 2019 2:25 pm
Forum: hardware
Topic: Acorn 28-AKF17 Monitor
Replies: 27
Views: 2113

Re: Acorn 28-AKF17 Monitor

Note that the AKF-17 doesn't support a Vsync - it expects a composite sync input on pin7! Given that the AKF-17 is a re-badged Phillips CM8833-MkII, the service manual for the CM8833 (MkI) may be a good starting point. Have you tried the CVBS (composite video) input, to see if that works? Any differ...
by Kazzie
Wed Sep 18, 2019 12:59 pm
Forum: hardware
Topic: A3000 post-battery-leak-repair
Replies: 16
Views: 337

Re: A3000 post-battery-leak-repair

I have re-tried the serial port. It is still the same, I can type on the A3000 and it shows up on the Windows PC terminal window and if I cange from ZModem to ASCII I can send basic text files to the PC (but with an error on A3000 "This error should not be possible 0:1). But I can't send anything f...
by Kazzie
Wed Sep 18, 2019 12:54 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

It looks to me like you have one broken track, nearest the battery, between LK7 and the C6 label.

Naturally, an electrical check with a multimeter is a bit more trustworthy than a Mk1 eyeball... :wink:
by Kazzie
Wed Sep 18, 2019 6:17 am
Forum: software
Topic: RISC OS 2 - !System and software
Replies: 7
Views: 174

Re: RISC OS 2 - !System and software

I've got a few copies of the RISC OS 2 application discs knocking about, but no updates for them.
by Kazzie
Tue Sep 17, 2019 6:23 pm
Forum: hardware
Topic: Acquired an A3010 today - help needed
Replies: 53
Views: 520

Re: Acquired an A3010 today - help needed

Thank you. I will start the process with cleaning tomorrow then, and I'm afraid I'm going to need to lean heavily on you all for help with the rest of it! I need to purchase a multimeter, will any do? The key feature you'll want is a continuity test. Any meter can measure a very low resistance (a c...
by Kazzie
Tue Sep 17, 2019 12:53 pm
Forum: hardware
Topic: Acorn 28-AKF17 Monitor
Replies: 27
Views: 2113

Re: Acorn 28-AKF17 Monitor

I see. One question remains as I want to use this CRT for several old computers from Archimedes to Atari STE: Where ist Pin #1 located if you you look upon this male connector at the AKF17 ? Some Atari cable I have here is confusing my efforts to connect the CRT properly at all. After confirming on...
by Kazzie
Mon Sep 16, 2019 8:07 pm
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 25
Views: 1300

Re: A Website dedicated to the Acorn System Computers

You're welcome. I hope to get back to System-related stuff in the coming weeks too, prompted in part by Beebmaster's sale of 8271 chips here. I've got a printout of the 40x25 technical manual courtesy of your site, and at least some of the chips I'll need to build it. The vague plan is: Make a 40x25...
by Kazzie
Mon Sep 16, 2019 2:54 pm
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2524

Re: The 8-Bit Guy's new 65816 based computer

BigEd wrote:
Mon Sep 16, 2019 2:00 pm
One nice thing about through-hole is that you can sell as a kit. So no assembly costs. But there will be support costs, and returns, from people who really don't know what they are doing.
As Acorn and Science of Cambridge found out first-hand!
by Kazzie
Mon Sep 16, 2019 12:34 pm
Forum: for sale / freebies
Topic: Acorn BBC / Z80 / Electron for sale - SOLD
Replies: 5
Views: 262

Re: Acorn BBC / Z80 / Electron for sale

dkupers wrote:
Mon Sep 16, 2019 11:31 am
@paulj: Seems I'm not allowed to reply to PMs.
A friendly request to the forum admins (using the Contact Us envelope at the bottom of the page) will usually get them enabled before you hit the required post count.
by Kazzie
Mon Sep 16, 2019 12:30 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 410

Re: Beeb Power Up Issue

The reason is ask is because my beeb has being doing the low burrrp noise and will only continue to boot if I press break. It’s being doing this for the last 30 years! My dad tried to fix it but never managed to diagnose the problem, so I’m interested to read what you’ve done to sort your issue :) ...
by Kazzie
Mon Sep 16, 2019 9:45 am
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 205
Views: 7027

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

1024MAK wrote:
Mon Sep 16, 2019 9:37 am
You keep her on a table :shock:
A pedestal, shurely! :D
by Kazzie
Mon Sep 16, 2019 4:11 am
Forum: off-topic
Topic: Acorn Art Thread
Replies: 886
Views: 60635

Re: Acorn Art Thread

Elminster wrote:
Sun Sep 15, 2019 7:49 pm
daveejhitchins wrote:
Sun Sep 15, 2019 4:10 pm
pixelblip wrote:
Sun Sep 15, 2019 10:46 am
Jacobean 21st Century pixelart - this took me bloody ages with the mouse ...arrrgh!
But well worth it =D>

Dave H :D
Agree. Perhaps need support for one of them drawing tablets thingies
Light pen? :)
by Kazzie
Sun Sep 15, 2019 11:38 am
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 25
Views: 1300

Re: A Website dedicated to the Acorn System Computers

Another correction: The System 5 Memory Map Diagram has the 2K video RAM labelled as being from $1000 to $1FFF, but is shown as being in block 2 instead. The 32K DRAM is labelled as being from $2000 to $3FFF, occupying blocks 3-9. From the System 5 handbook, the default should be $2000 to $7FFF (blo...
by Kazzie
Sun Sep 15, 2019 11:31 am
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 117
Views: 7334

Re: IDE interfaces - hardware details

Is it feasible for the ROM to be adapted so it presents itself as an ADFS filing system? (Which may involve accepting some ADFS shortcomings, like lack of partitions etc.) I think you have an original V1 card. So you should be able use the ROM image from the original ZIDEFS distribution, which has ...
by Kazzie
Sun Sep 15, 2019 9:07 am
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2524

Re: The 8-Bit Guy's new 65816 based computer

I'm of a similar opinion to BigEd, as i hadn't followed any of the intermediate discussion either. It may not be a direct update to the initial design, but it's certainly an update on the progress of the project. And it still looks promising, to me. The current direction seems to be 6502-based proce...
by Kazzie
Sun Sep 15, 2019 8:06 am
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 117
Views: 7334

Re: IDE interfaces - hardware details

If you don’t need the ClassNet stuff could you *unplug it or make a new ROM for that podule instead? It a bit cheeky of it fiddling with other settings, although I can add any it does it. A new ROM is a possibility, though the 32-pin ROM is larger than my antediluvian EPROM programmer can handle. *...
by Kazzie
Sun Sep 15, 2019 5:44 am
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 117
Views: 7334

Re: IDE interfaces - hardware details

I'm aware that the on-board ROM (as provided) has three different varieties of the IDEFS software, such that it can present itself as any one of a IDEFS, SIDEFS, or ZIDEFS filing system. Is it feasible for the ROM to be adapted so it presents itself as an ADFS filing system? (Which may involve accep...
by Kazzie
Sun Sep 15, 2019 5:24 am
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 410

Re: Beeb Power Up Issue

And a further =D>
by Kazzie
Sat Sep 14, 2019 7:55 pm
Forum: hardware
Topic: Troubleshooting an Oak Solutions Classnet podule
Replies: 3
Views: 119

Re: Troubleshooting an Oak Solutions Classnet podule

And one last message for the night: With the ClassNet card installed and connected directly to the BNC socket of an EN104 ethernet hub, the EN104's BNC Active LED is lit when the A420/1 is OFF, and unlit when the A420/1 is on. Removing LK1 (which enables T2, the 2VP5U9 step-up voltage transformer th...
by Kazzie
Sat Sep 14, 2019 7:30 pm
Forum: hardware
Topic: Troubleshooting an Oak Solutions Classnet podule
Replies: 3
Views: 119

Re: Troubleshooting an Oak Solutions Classnet podule

A possibly relevant link: https://web.archive.org/web/20040608192339/http://www.planet.demon.co.uk/oakdci4.html A DCI4-upgraded ROM image for the ClassNet podule. I've no idea if that's what's currently on my card or not. Also: https://www.niftysoftware.co.uk/ns/index.htm CMOS Fix Fixes CMOS checksu...
by Kazzie
Sat Sep 14, 2019 7:13 pm
Forum: hardware
Topic: Troubleshooting an Oak Solutions Classnet podule
Replies: 3
Views: 119

Re: Troubleshooting an Oak Solutions Classnet podule

Some further observations: IC5 is a ST 93C46AB1 1K serial EEPROM. When booting the machine with it removed, it hangs in the same manner. On doing a Delete-boot, I am told Warning: Station number not available EERrom data partition corrupt And the machine continues to boot to the desktop. At this poi...
by Kazzie
Sat Sep 14, 2019 5:51 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 410

Re: Beeb Power Up Issue

If we're playing with interrupts, there's also the NMI to consider. At least that's just two sources to consider (IC27 pin 3 for the Econet, and IC27 in 8 for the FDC).
by Kazzie
Sat Sep 14, 2019 5:08 pm
Forum: software
Topic: Networking: how to setup TCP/IP for an Oak Solutions ClassNet podule?
Replies: 12
Views: 1079

Re: Networking: how to setup TCP/IP for an Oak Solutions ClassNet podule?

Does anyone have a manual, especially when it comes to the jumpers LK1..8? LK1 seems to switch the thin ethernet (10base2) on/off - is that correct? LK2-7 appear to switch between the AUI interface (10base5) and thin ethernet LK8 ?? unclear No manual, but from examining the board, and reading the M...
by Kazzie
Sat Sep 14, 2019 2:33 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 410

Re: Beeb Power Up Issue

I'd expect nRSTA to get higher than 2.5V, given that IC3 is the only load on the circuit (other than your scope):
BBC-RSTA.png
Circuit for generating RSTA signal
BBC-RSTA.png (6.21 KiB) Viewed 385 times
Take a look at D1, C10 and R20, to check they're present and behaving correctly.
by Kazzie
Sat Sep 14, 2019 1:49 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 410

Re: Beeb Power Up Issue

Hi, I've got a beeb that will not power up very reliably. 9 times out of 10 I will just get a low constant beep. Pressing Ctrl Break nearly always brings it to life. I've scoped the nRSTA and nRST lines (pins 34 on the 2 VIAs), and see nRSTA on IC3 rising first, followed by nRST on IC69 rising abou...