Search found 846 matches

by KenLowe
Fri Feb 21, 2020 5:48 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 77
Views: 2938

Re: New Raspberry Pi to 1MHz bus interface

Ok folks, I've placed an order for a 2nd batch of boards. Unfortunately board manufacturing has been severely disrupted by the Coronavirus outbreak. The PCBs have all been manufactured, but the SMT assembly is still outstanding. Could be another couple of weeks yet before that's done, and then a fu...
by KenLowe
Sun Feb 16, 2020 8:32 pm
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 149
Views: 7840

Re: Beeb 1MHz Bus FPGA Adaptor

Hi Dave... Picking up on the comment about the possible incompatibility with the IntegraB board, I dug out my 1MHz Bus FPGA Adaptor board today with a view to ordering up all the necessary components to test this out. However, I notice that the ebay seller no longer stocks the Xilinx FPGA Spartan 6 ...
by KenLowe
Sun Feb 16, 2020 9:29 am
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 149
Views: 7840

Re: Beeb 1MHz Bus FPGA Adaptor

But i think it's becouse of Integra-B, since i use that board it freezes sometimes... tomorrow i'll give a try with my others micros Your IntegraB shouldn't be causing your computer to freeze. This will give me the motivation to build up my 1MHz Bus FPGA Adaptor, just to confirm it works with the I...
by KenLowe
Fri Feb 14, 2020 10:25 am
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 180
Views: 8820

Re: BeebSCSI 7_7

I've made a blank 512MB image & associated disc geometry file which can be dropped into a BeebSCSI directory if anyone is interested in that as a "quick-start", it squashes down to only a few KB. Although I would make my own image from scratch anyway, I couldn't easily find whether there was alread...
by KenLowe
Tue Feb 11, 2020 8:51 am
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 77
Views: 2938

Re: New Raspberry Pi to 1MHz bus interface

BTW: if you could upgrade my expression of interest to a 1MHz bus interface and a tube adapter, that would be great. :) although depending on price I may need to consider 2 of each ... especially if soldering is involved ... don't ask ... Updated to one of each. No soldering required. Should work s...
by KenLowe
Mon Feb 10, 2020 12:55 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 77
Views: 2938

Re: New Raspberry Pi to 1MHz bus interface

Ok folks, I've placed an order for a 2nd batch of boards. I'm still not taking orders yet, but assuming they work as expected, then the following is the list of noted interest in the order I received it. If you think I've missed your name out, or if you would like your name added, please let me know...
by KenLowe
Sat Feb 08, 2020 12:58 pm
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 180
Views: 8820

Re: BeebSCSI 7_7

Hopper wrote:
Sat Feb 08, 2020 10:52 am
Anyone putting together beebscsi hardware?
I'm in the process of building a 1MHz port level shifter, which allows the BeebSCSI software to run on a Raspberry PI, if that would be of any use. Just finalising the board layout now.
by KenLowe
Fri Feb 07, 2020 1:43 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 77
Views: 2938

Re: New Raspberry Pi to 1MHz bus interface

It's probably going to be a few weeks yet before I can start offering these for sale. I've been working with a couple of the forum members to try and address the audio quality issues I mentioned earlier, and I'm hoping we're just about there now. I'm just waiting for some components so I can test th...
by KenLowe
Tue Feb 04, 2020 3:18 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 77
Views: 2938

Re: New Raspberry Pi to 1MHz bus interface

A quick update for those who are waiting. There was a bit of a delay to testing as I tried to get a Master up and running over the weekend, so I could run the Music 5000 software. That's now done, and testing with the Master is ongoing. Now that I know what I'm doing with Music 5000, I've also manag...
by KenLowe
Sun Feb 02, 2020 5:14 pm
Forum: hardware
Topic: SOLVED - Master 128 (No2) - Video Fault
Replies: 3
Views: 224

Re: SOLVED - Master 128 (No2) - Video Fault

Does anyone stock replacement key switches for the Master? A couple are still unreliable, even after cleaning the pins.

Thanks.

Edit: Got a few on order from RetroClinic.
by KenLowe
Sun Feb 02, 2020 11:07 am
Forum: general
Topic: Today I received.....
Replies: 5664
Views: 477896

Re: Today I received.....

Yes, it's an AP3. Whatever one of those is!
by KenLowe
Sat Feb 01, 2020 11:51 pm
Forum: hardware
Topic: SOLVED - Master 128 (No2) - Video Fault
Replies: 3
Views: 224

Re: Master 128 (No2) - Video Fault

After poking around a bit more with this one, I now have colour again. But the screen is still corrupt. It doesn't come out very clearly in the photo, but this is Mode 2 showing the 8 colours, but with corrupt text. I get the same corruption in both normal (Mode 2) and shadow (Mode 130) modes: 20200...
by KenLowe
Sat Feb 01, 2020 11:02 pm
Forum: hardware
Topic: SOLVED - Master 128 (No2) - Video Fault
Replies: 3
Views: 224

SOLVED - Master 128 (No2) - Video Fault

Master 128 No2 has had a bit of battery leakage (or other corrosive fluid) damage to the upper left hand corner of the PCB. I still need to do a proper clean of the board, but I've had a quick look at the tracks (shining a torch through the PCB), and they all look to be in place. I've also done some...
by KenLowe
Sat Feb 01, 2020 10:15 pm
Forum: hardware
Topic: Master 128 (No1) - Short Circuit
Replies: 6
Views: 234

Re: Master 128 - Short Circuit

I'd hook up power from a bench supply and see if I can work out what is getting hot to locate the short. The short is enough to shut down the Master PSU. Would a bench supply work differently? In any case, I don't actually have a bench supply, but I have been considering getting one, and this might...
by KenLowe
Sat Feb 01, 2020 9:23 pm
Forum: hardware
Topic: Master 128 (No1) - Short Circuit
Replies: 6
Views: 234

Re: Master 128 - Short Circuit

Most of the decoupling capacitors are brown ceramic disc. I can see one rectangular capacitor that is blue in colour. Good plan about cutting out the capacitors and testing. I'll need to order up a replacement batch first, though.

Any other thoughts from anyone?
by KenLowe
Sat Feb 01, 2020 9:06 pm
Forum: general
Topic: Today I received.....
Replies: 5664
Views: 477896

Re: Today I received.....

Not so much 'Today I received as 'Today I re-discovered'... The other day, I went searching my Master, and found it in the loft. When I opened it up, it didn't have a Co Pro in it, and I recalled having a Co Pro when I looked at it last. Anyway, putting that to one side, today I tried to power up th...
by KenLowe
Sat Feb 01, 2020 7:51 pm
Forum: hardware
Topic: Master 128 (No1) - Short Circuit
Replies: 6
Views: 234

Master 128 (No1) - Short Circuit

Hi folks, I'm trying to get an old Master 128 up and running. The battery pack is needing replaced, but that's the least of my problems right now... Unfortunately the bigger issue is that, even with all external devices (PSU, keyboard, battery pack & speaker) disconnected and removable ICs (IC15 & I...
by KenLowe
Thu Jan 30, 2020 2:56 pm
Forum: emulators
Topic: MAME: IDE/SCSI and other large storage devices
Replies: 47
Views: 1954

Re: MAME: IDE/SCSI and other large storage devices

KenLowe: It sounds like the Viglen Host Adaptor is an exact clone of the Acorn board, would you agree? Yes, I believe so. It's using all the same components. I did start to trace out my newer Viglen board to verify it against the circuit diagram that's floating around the web, but that's another st...
by KenLowe
Wed Jan 29, 2020 11:42 pm
Forum: emulators
Topic: MAME: IDE/SCSI and other large storage devices
Replies: 47
Views: 1954

Re: MAME: IDE/SCSI and other large storage devices

I get a 'Disc Error 70 at :1/000500' error for *MOUNT 1 Similarly, I get a 'Disc Error 70 at :2/000500' error for *MOUNT 2 This is with a Viglen host adaptor connected to a Fujitsu SCSI drive (ie not an ACB-4000A). I'm fairly sure it's not possible to have mutiple LUNs with this drive. At one stage...
by KenLowe
Wed Jan 29, 2020 9:23 pm
Forum: hardware
Topic: My Monks Risborough Beeb
Replies: 29
Views: 913

Re: My Monks Risborough Beeb

I wonder if your TV perhaps doesn't support RGB via Scart? I had a look through the manual, and couldn't find any reference to it. My LG TV has a label specifically indicating that Scart input AV1 supports RGB. If your TV doesn't support RGB via Scart, then you might want to consider using a Scart t...
by KenLowe
Wed Jan 29, 2020 8:42 pm
Forum: emulators
Topic: MAME: IDE/SCSI and other large storage devices
Replies: 47
Views: 1954

Re: MAME: IDE/SCSI and other large storage devices

I get a 'Disc Error 70 at :1/000500' error for *MOUNT 1 Similarly, I get a 'Disc Error 70 at :2/000500' error for *MOUNT 2 This is with a Viglen host adaptor connected to a Fujitsu SCSI drive (ie not an ACB-4000A). I'm fairly sure it's not possible to have mutiple LUNs with this drive. At one stage,...
by KenLowe
Tue Jan 28, 2020 11:41 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

That's great progress Ken, looks like you are sorted. And as an added bonus, I've now got new spare RAM, a Cypress FX2 development board and some new Dupont cables on order for future projects 🙄. I'm sure they will come in handy. I'll probably still also order the CPU breakout board PCBs, because t...
by KenLowe
Tue Jan 28, 2020 9:07 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

That's correct. ROM versions 0.01 and 0.04 both work in my 2nd processor when run along with NFS 3.34 in the Beeb.
by KenLowe
Tue Jan 28, 2020 6:46 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

Or upgrade the Tube ROM to version 0.05, and it will work with current Tube Host code. Spot on. That worked: 20200128_182001.jpg Also, please do upload a dump of this NFS version, in case the tube host code is non-standard. Attached: NFS_334.ROM One other thought on compatibility... Your Co Pro has...
by KenLowe
Tue Jan 28, 2020 5:53 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

Hmmm. Interesting. With NFS3.34 installed:
20200128_174753.jpg
Tube OS 0.01
20200128_174656.jpg
Tube OS 0.04
So Dave, as you suspected, there isn't actually anything wrong with it! Phew!

Now just need to this version of the tube host code into MMFS & DNFS!!!
by KenLowe
Tue Jan 28, 2020 4:45 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

This Co-Pro definitely used to work fine on a standard OS1.2 beeb. I'm fairly sure it worked with the standard DNFS ROM, but I know it definitely worked with a slightly older NFS (3.41?) ROM. I'll dig out this older ROM later this afternoon / evening and try it with that instead.
by KenLowe
Mon Jan 27, 2020 11:03 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

Nice, that will work very well I think. You also need to find some nice "dupont" cables that don't keep falling off (like mine do). Maybe you have some of these already. Dave Yup. I've got a few spare dupont cables, but I'm running a bit short, so I'll need to order some more. It'll be a couple of ...
by KenLowe
Mon Jan 27, 2020 10:11 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

The alternative I guess is to make a small breakout/adapter board. This could either be a proper PCB, or just a pair of turned-pin DIP sockets with wires soldered into the middle. Great idea! That's exactly what I'll do. I'm about to place an order for some new 1MHz level shifter PCBs, so I'll get ...
by KenLowe
Mon Jan 27, 2020 8:33 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

Here you go, though I'm not suspecting it to be a ROM issue. As all early ROM versions fail in all emulators leads me to believe there is something different with this co-pro. The code runs on the Beeb and co-pro and doesn't jump into the unknown, the OS sits waiting for a response from the Tube. T...
by KenLowe
Mon Jan 27, 2020 8:28 pm
Forum: hardware
Topic: Faulty 6502 Co-Pro
Replies: 54
Views: 780

Re: Faulty 6502 Co-Pro

The alternative I guess is to make a small breakout/adapter board. This could either be a proper PCB, or just a pair of turned-pin DIP sockets with wires soldered into the middle. Great idea! That's exactly what I'll do. I'm about to place an order for some new 1MHz level shifter PCBs, so I'll get ...