Search found 869 matches

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: 51
Views: 2302

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
Replies: 4
Views: 159

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: 314

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: 155
Views: 5897

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: 60318

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: 22
Views: 1177

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: 7216

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: 51
Views: 2302

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: 7216

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: 7216

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: 314

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: 81

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: 81

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: 81

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: 314

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: 1029

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: 314

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 289 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: 314

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...
by Kazzie
Sat Sep 14, 2019 1:43 pm
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

Nope, the stepper motor and heads move freely and smoothly when I move them by hand so it is going to be controller/electrical rather than mechanical. Right, so the faulty drive, you can move the heads freely, but the drive doesn't make any attempt to move them by itself. On that basis, things to c...
by Kazzie
Sat Sep 14, 2019 1:20 pm
Forum: hardware
Topic: Troubleshooting an Oak Solutions Classnet podule
Replies: 3
Views: 81

Troubleshooting an Oak Solutions Classnet podule

(With reference to this existing thread ) I've bought a 16-bit Classnet ethernet card for my A420/1. I don't seem to be having much luck getting it to do anything, however. I've removed the Econet and ZIDEFS cards from the system, so they're not causing any problems. When doing a Delete-boot, I am s...
by Kazzie
Sat Sep 14, 2019 12:17 pm
Forum: hardware
Topic: ADFS/ZIDEFS format for using CF card with PC?
Replies: 6
Views: 461

Re: ADFS/ZIDEFS format for using CF card with PC?

That's a good idea, and one I'll try, but I also want to use this SD card to replace the existing ESDI drive, so I'd want an ADFS partition on there too. (If I can't get a second partition, I might have to opt for a second CF card and converter.) Did you ever get this working ? Have an A5000 myself...
by Kazzie
Sat Sep 14, 2019 11:30 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

Good to see you've got one drive working. =D>

A nice thing about having two identical drives is that you can use one as a reference when troubleshooting the other. :)

(Am I right in concluding that with the faulty drive, trying to rotate the stepper motor axle by hand didn't move it at all?)
by Kazzie
Sat Sep 14, 2019 7:52 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

Hi, One thing missing from your photo album is any pictures of the floppy drive. :wink: I'm going to work on the assumption that the photos on this side are a good match for your drive, for the time being. This drive has an older style of stepper motor, being that big black lump of a cube in the cor...
by Kazzie
Fri Sep 13, 2019 6:45 pm
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

I'm sure we can get some sense out of these drives for you. Removing all but one of the disk ROMs is a good idea. It should be the case that only the one in the highest priority socket is activated, but better safe than sorry! I presume (given that you've un-stuck the motor on one) that you've opene...
by Kazzie
Fri Sep 13, 2019 11:05 am
Forum: wanted
Topic: The Towering Inferno typein listing for BBC Micro
Replies: 11
Views: 764

Re: The Towering Inferno typein listing for BBC Micro

leenew wrote:
Fri Sep 13, 2019 11:04 am
I am presently typing in 36 gamaes from a book
And proof-reading them too! :P
by Kazzie
Fri Sep 13, 2019 9:21 am
Forum: hardware
Topic: Acorn 28-AKF17 Monitor
Replies: 21
Views: 1981

Re: Acorn 28-AKF17 Monitor

I will solder a designated adapter cable from a VGA cable to connect my 3010 to the AKF17. No problem. There is valuable information inside this Welcome Guide. I did not bother until now. This ID-setting for some monitor sensing is interesting. Will be trying to adapt it to my new cable. So Acorn w...
by Kazzie
Fri Sep 13, 2019 4:31 am
Forum: off-topic
Topic: Experiences with 4G broadband
Replies: 16
Views: 279

Re: Experiences with 4G broadband

when they tried 5G for 5mins, did the birds not all die & fall out the sky?? sure I read the gHz is too close to microwave ovens, hence fried birds brains inside to out :evil: Bluetooth and Wifi, (specifically the old 802.11b and g varieties) are exactly that: they use the unlicensed 2.4GHz portion...
by Kazzie
Fri Sep 13, 2019 4:22 am
Forum: software
Topic: Lost RISC OS Econet, AUN and NFS software
Replies: 15
Views: 1794

Re: Lost RISC OS Econet, AUN and NFS software

I'm sure it would make life easier if all these files that one thought were missing, but turn out to have been there all along, were given the filetyp ffs instead... :wink:
by Kazzie
Fri Sep 13, 2019 4:17 am
Forum: hardware
Topic: A3000 battery damage repair.
Replies: 23
Views: 707

Re: A3000 battery damage repair.

Great diagram, thanks. Working from the circuit diagram, pins 2, 3, and 5 of IC31 are unused and grounded. So with the possible exception of pin 4 (3D) for nR/W, IC31 appears to be working perfectly. A lack of Phi 1 on the LE pin could explain most of the lack of activity on IC29,30. Let's hope you ...
by Kazzie
Thu Sep 12, 2019 7:06 pm
Forum: hardware
Topic: Upgrading A310 RISC OS 2 to 3.11
Replies: 11
Views: 200

Re: Upgrading A310 RISC OS 2 to 3.11

Yeh! RISC OS 3.11 is up and running :D The problem was relying on eyesight rather than technology. It looked like there were no tracks at LK12 from pins 1-2 & 3-4 but they were covered by the white paint. Checking continuity with my multimeter before & after cutting the tracks solved the problem. T...