Search found 282 matches

by simonm
Sun Jun 02, 2019 1:15 pm
Forum: hardware
Topic: 2Mhz clock from 4Mhz crystal
Replies: 5
Views: 191

Re: 2Mhz clock from 4Mhz crystal

Fantastic thanks! This looks perfect. Will an SN74LS74AN do the trick?
by simonm
Sun Jun 02, 2019 12:41 pm
Forum: hardware
Topic: 2Mhz clock from 4Mhz crystal
Replies: 5
Views: 191

2Mhz clock from 4Mhz crystal

Hi folks, I've got an electronics question that Google hasn't been able to help me with, and I know wizards live here. Are there any clever tricks to get a 2Mhz clock signal out of a 4Mhz crystal? I have a project where I want to drive two chips - one at 4Mhz and one at 2Mhz but I only have 4Mhz cry...
by simonm
Mon May 27, 2019 12:07 am
Forum: hardware
Topic: A3010 - HCCS or Castle IDE?
Replies: 3
Views: 169

Re: A3010 - HCCS or Castle IDE?

Thanks Dan. Yes it is - the Ultimate IDE one.
As per topic here: viewtopic.php?t=7900

This one is better then?
by simonm
Sun May 26, 2019 11:40 pm
Forum: hardware
Topic: A3010 - HCCS or Castle IDE?
Replies: 3
Views: 169

A3010 - HCCS or Castle IDE?

I've been lightly following the various topics on the CF compatibility and Wizzo talk, but not fully upto speed yet, so my question is:

I have two IDE upgrade options for my A3010 - one is a HCCS IDE board, and the other is a Castle IDE.
Which one would you say is the best one to keep/use?
by simonm
Sun May 26, 2019 2:40 am
Forum: software: new games
Topic: Moon Patrol for the beeb (New port, just starting)
Replies: 27
Views: 1904

Re: Moon Patrol for the beeb (New port, just starting)

Love it. So smooth and the colours are great! Plus I'm a big fan of how you use the arcade fonts too. =D>
by simonm
Wed May 15, 2019 11:15 pm
Forum: software: new games
Topic: Stunt Car Racer for BBC Master
Replies: 60
Views: 3080

Re: Stunt Car Racer for BBC Master

I also can't speak for Kieran, but I'm sure he'd agree that having a starting point of some existing source code + graphics for a game (even if its a different platform/language) is a significant motivator + boost for getting something going. I have a ton of respect for folks that create new or homa...
by simonm
Wed May 15, 2019 11:03 pm
Forum: off-topic
Topic: Making the most of the sun
Replies: 15
Views: 416

Re: Making the most of the sun

2019-04-21 14.24.14.jpg 2019-04-22 13.48.22.jpg I didn't even bother to disassemble this one and the keys came up lovely. 2019-05-12 14.26.41.jpg 2019-05-12 19.05.10.jpg 2019-04-21 13.24.31.jpg 2019-04-21 15.01.26.jpg 2019-04-22 15.15.21.jpg 2019-04-22 18.57.06.jpg 2019-04-22 18.57.21.jpg 2019-04-2...
by simonm
Wed May 15, 2019 10:54 pm
Forum: off-topic
Topic: Making the most of the sun
Replies: 15
Views: 416

Re: Making the most of the sun

This is glorious stuff, I love seeing machines getting restored colours. I've been doing the same recently (particularly over the easter sunny bank holiday) - it's SO satisfying! :lol: I've taken some almost-orange Archimedes keyboards and mice back to their former glory using the exact same method....
by simonm
Mon May 13, 2019 11:55 pm
Forum: hardware
Topic: Internal ideA Interface - Versions
Replies: 8
Views: 1245

Re: Internal ideA Interface - Versions

FWIW I can confirm that the v5 firmware does detect and work ok with a bog standard ebay IDE/CF adapter (using 512Mb sandisk ultra II card). However, I can't seem to get it to work alongside another drive (in either slave/master or master/slave configs). :(
by simonm
Mon May 13, 2019 1:12 am
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

So I've decided to leave the faulty machine alone just now, and concentrate on harvesting the best bits to build a beast using the good motherboard. I've also transplanted the ARM3 CPU board into this mb Nicking the best bits then, I now have at least one good working, nicely retrobrited, salvaged &...
by simonm
Sun May 12, 2019 5:43 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Wow, that’s a stroke of calculated luck! Apart from the obvious “it is the right thing to do” is there any other compelling reason not to leave IC7 piggy backed (soldered on)? Given the work (and risk) of replacement it sounds to me as a fair consideration? Kinda wishing I had done that now. I snip...
by simonm
Sun May 12, 2019 1:44 am
Forum: hardware
Topic: Case screws available anywhere?
Replies: 16
Views: 2729

Re: Case screws available anywhere?

Here's me thinking it would be easy to find some spare case screws for a BBC Master - I had no idea screws came in so many flavours! Does anyone know the exact (or nearest) specs for the master case screws? I can't find any data on the interweb. All I know is that the long ones are round pan head po...
by simonm
Sat May 04, 2019 11:09 pm
Forum: software: new games
Topic: Doom?
Replies: 123
Views: 5569

Re: Doom?

This is all so ace. =D> I'm amused at the idea of the various rendering options being similar to PC games config menus where you set your anti aliasing or trilinear texture mapping etc, except the beeb version is mode 1, mode 2 or mode 8 with the various colour and res tradeoffs instead! :lol:
by simonm
Sat May 04, 2019 6:22 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Wow, that’s a stroke of calculated luck! Apart from the obvious “it is the right thing to do” is there any other compelling reason not to leave IC7 piggy backed (soldered on)? Given the work (and risk) of replacement it sounds to me as a fair consideration? I agree, I feel pretty lucky it wasn't so...
by simonm
Sat May 04, 2019 2:39 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Thanks for the tips Paul. I've narrowed the fault down to IC7, IC11 is fine.
This might be crazy talk, and probably not the cleanest solution, but could I cut the old IC out leaving the legs, and then solder the new IC legs onto the old legs?
There's no room to manoeuvre under the board at all.
by simonm
Sat May 04, 2019 12:38 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Ok, well with the fault identified I guess my next step is to replace those IC's - what would you folks suggest? Getting to the underneath of the board for soldering is going to be impossible without removing the whole thing, and I'm feared of breaking something else in the process of doing that. Sh...
by simonm
Sat May 04, 2019 12:33 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

The mod procedure, for the firmware update is here . I can do this for you, if required (?) Dave H :D Sounds very interesting Dave, I'll be coming onto that shortly when I'll be wanting to choose the best components out of the two machine! Time to buy the desoldering gun, Simon :) Haha - yes. Here ...
by simonm
Fri May 03, 2019 10:24 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Oh. My. Days. The gods are good. I piggy backed two new 74LS138N chips on the ones on the RAM board, and it boots to desktop! :shock: [-o< There I was with my pen and paper in hand ready to capture the next POST error! It's another 4Mb, RISC OS 3.10. My deepest gratitude to everyone and especially p...
by simonm
Fri May 03, 2019 10:06 am
Forum: development tools
Topic: Stardot Github Website
Replies: 9
Views: 364

Re: Stardot Github Website

I've experimentally setup a Github team with full contribution access to the repo, so feel free to add yourself or request access to the team. https://github.com/orgs/stardot/teams/website Essentially, anything in the docs folder is open for business. The theme stuff around it is just template stuff...
by simonm
Fri May 03, 2019 10:02 am
Forum: development tools
Topic: Stardot Github Website
Replies: 9
Views: 364

Re: Stardot Github Website

What tool are you using or are you handcrafting? I am using LightPaper on the Mac. Doing by hand got boring. I tend to compose/edit "quick" markdown docs just in a regular text editor (Notepad++). For more involved stuff I use Visual Studio Code. There's plenty of choice for markdown editors now it...
by simonm
Fri May 03, 2019 9:51 am
Forum: development tools
Topic: Stardot Github Website
Replies: 9
Views: 364

Re: Stardot Github Website

Thanks for the feedback so far. Sounds like it might be useful then. As long as the content can be migrated to other providers (should it prove necessary in the future), I'm happy to pitch in with content every now and then. :) Do you want to put a license declaration on each page, maybe in the page...
by simonm
Fri May 03, 2019 12:32 am
Forum: development tools
Topic: Stardot Github Website
Replies: 9
Views: 364

Stardot Github Website

Our little stardot GitHub organisation is not so little anymore, which is great! Anyway it had me thinking that it might be worthwhile having a mini website as part of the github organisation that could be used to provide some useful hub for reference material to the various projects that are hosted...
by simonm
Mon Apr 29, 2019 11:12 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

In other odyssey news, I've been on ebay looking at chips. Rock and roll. So, there's SN74ALS138N and DM74ALS138N and SN74ALSAN chips on ebay. TIL that the "SN" and "DM" bit is the manufacturer (Texas Instruments and National Semiconductor respectively), but out of curiosity whats the difference bet...
by simonm
Mon Apr 29, 2019 10:51 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Thanks Steve. A dual colour LED makes much more sense. And who knows maybe it IS yours?! Did you sell it onto a video enthusiast?! :lol:
by simonm
Mon Apr 29, 2019 10:42 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

In the spirit of initiative I did some light research on how to fault find these chips. I read that its sometimes a quick useful test to piggy back the suspected chips with new chips to see if that fixes the issue? Also I read that using a logic probe to test if certain pins are floating or continuo...
by simonm
Mon Apr 29, 2019 9:59 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Indeed - it looks even more permanent from the other side - resistors soldered directly onto the pins etc. :shock:
2019-04-29 22.55.00.jpg
These fitting instructions for a Simtec board look similar and certainly not for the faint hearted!
by simonm
Mon Apr 29, 2019 9:40 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

For the A310, you need to be looking at IC59 on the motherboard which is a 74ALS138. I'd also investigate IC77 which is used for bank switching and feeds into the ALS138. Your problem here is that they're under your RAM board but I suspect if your A300 RAM expansion is like mine, one of those two c...
by simonm
Mon Apr 29, 2019 8:17 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Thanks for the help so far everyone! Have you done another DEL on power on since getting the VIDC clock reconnected? If not, do this first to see if the CMOS RAM checksum error goes away. If it does, then we're making progress. If not then we may have a common issue in reading the CMOS and accessing...
by simonm
Sun Apr 28, 2019 11:02 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Aha, I reconnected the floppy drive and it's now flashing error codes at me. So those PL3a jumpers must have been necessary to get the POST to start maybe. Decoding the fault code gives me 00020101. I'm reading that as a RAM control line failure, and CMOS RAM checksum fail ? (no flag for ARM3 detect...
by simonm
Sun Apr 28, 2019 10:28 pm
Forum: hardware
Topic: A310 restoration
Replies: 71
Views: 1421

Re: A310 restoration

Ok, so are you booting without the colour card fitted? If so, you may be missing the jumpers you need to connect the sysclock to the VIDC chip at the very least. You will need a jumper on 1-2 and 3-4 of PL3a to use the machine without the colour card I believe. Paul Good thinking - yes I was bootin...