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by tom_seddon
Mon Aug 03, 2020 1:18 am
Forum: 8-bit acorn hardware
Topic: Master 128 Issue 1/2 differences
Replies: 1
Views: 94

Re: Master 128 Issue 1/2 differences

I've got an issue 2 Master. If you don't get any better offers, I'll try taking some close up daylight shots with my phone's camera and see if they stitch together OK.

--Tom
by tom_seddon
Sat Aug 01, 2020 12:29 pm
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

Yes probably a faulty socket. That's why 1024MAK always says test from chip leg to chip leg where possible. Did any of the earlier chip replacements help or was it just the CRTC bad traces all along? Bad CRTC traces, a bad trace in the memory addressing logic, and a faulty IC45 (74LS139). Broken IC...
by tom_seddon
Sat Aug 01, 2020 11:30 am
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

Regarding ROM socket 14 (IC100) - wrote some code to cycle through accesses to the ROM slots. IC20 pins 9-12 chip select outputs looked fine, but the corresponding pin 20 inputs were only going low for the chips in sockets 12, 13 and 15. Narrowed down to what I assume is not-quite continuity between...
by tom_seddon
Fri Jul 31, 2020 8:50 pm
Forum: 8-bit acorn hardware
Topic: The latest broken beeb repair
Replies: 36
Views: 684

Re: The latest broken beeb repair

Colday wrote:
Fri Jul 31, 2020 4:28 pm
@tom_seddon

Well, I have managed to locate a place in the UK that has some in stock, I am waiting for a quote.
Thanks - sounds good.

Regarding @, i don't think the forum understands it - i think people only get notified if you quote reply their post or reply to a thread they created.

--Tom
by tom_seddon
Fri Jul 31, 2020 4:18 pm
Forum: 8-bit acorn hardware
Topic: The latest broken beeb repair
Replies: 36
Views: 684

Re: The latest broken beeb repair

I checked with Mark at RC, he has no spare beeb RAM currently so I will be making an order with the United States of Murica! I'll open this up, does anyone else want to tag along with my order? Might do, I should probably get some spares as these don't seem particularly widely available. Feels like...
by tom_seddon
Fri Jul 31, 2020 1:12 am
Forum: archive submissions
Topic: Various 32K ROMs
Replies: 10
Views: 563

Re: Various 32K ROMs

Interestingly, Beebug's Master ROM carrier board's PAL chip is marked "IWORD". Thanks for these. The Master ROM 1.05 was previously undumped, dumped versions are 1.01 and 1.03. This actually uses the same carrier board PAL as Inter-Base. Of note is this version is dated 1991 whereas previous versio...
by tom_seddon
Thu Jul 30, 2020 10:55 pm
Forum: 8-bit acorn software: other
Topic: TECHNOMATIC EPROMER II EPROM PROGRAMMER
Replies: 6
Views: 1016

Re: TECHNOMATIC EPROMER II EPROM PROGRAMMER

Here's an ssd and adl of what claims to be EpromRyter 3.3 - "(c) 1986 GsoFt 11/87 V3.3".

The original was an ADFS disk, hence the adl file.

I've got a manual for this that looks to be slightly different from the one Dave posted. I'll get it scanned at some point.

--Tom
by tom_seddon
Wed Jul 29, 2020 11:11 pm
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

I assume I could just solder some wires on the bottom of the motherboard, and that'd fix it? The fix way is just put some wire point to point on the bottom side of the board. If you have lots of time you can hunt the breaks/bad vias down and repair them almost invisibly. It takes some practice. Wir...
by tom_seddon
Wed Jul 29, 2020 1:58 am
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

I replaced IC45, which made it start up in some fashion, producing a flickering, jumbled-looking display (all modes), and "BBC Computer 16K" regardless of S25 position. I replaced the rest of IC8-13, as I had spares, and I wanted the practice, but that made no difference. After some investigation, t...
by tom_seddon
Sun Jul 26, 2020 12:44 am
Forum: 8-bit acorn emulators
Topic: Index of links to 8-bit Acorn Emulators
Replies: 32
Views: 14150

Re: Emulator information

After going through Apple's "control + click, cancel, control + click, oh look, you now get the option to run the program, run program" rigmarole, b2 starts up and runs as expected. OK, I don't know enough to test everything, but it runs the program I'm developing so that's enough for me at this st...
by tom_seddon
Sat Jul 25, 2020 3:57 pm
Forum: 8-bit acorn hardware
Topic: BBC B CRTC problem?
Replies: 9
Views: 699

Re: BBC B CRTC problem?

This Beeb had been working fine again recently, but it started fairly reliably exhibiting the fault again last weekend. I never caught it in the act, though, as every time I connected my logic analyzer to IC45, the display went back to normal... I didn't overthink this, and replaced IC45. Seems to h...
by tom_seddon
Sun Jul 19, 2020 2:12 am
Forum: 8-bit acorn software: other
Topic: Discbeast, new disc and archival utility -- NEED VOLUNTEERS
Replies: 61
Views: 1983

Re: Discbeast, new disc and archival utility -- NEED VOLUNTEERS

I don't know about "interesting", but: PIAS8 Repton ATW 40 track side - failed to read (disk does look a bit bent...) PIAS8 Repton ATW 80 track side - 13def06e (this side seems OK but it did sound a bit clattery) Stryker's Run 40 track side - 6B04DA25 More may follow when I get time/feel brave enoug...
by tom_seddon
Fri Jul 17, 2020 2:06 am
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

marcusjambler wrote:
Fri Jul 17, 2020 1:32 am
Have you tried booting with different permutations of S25 jumper?
Yes - fails to boot in all cases. I think I'm narrowing it down to stuff that happens whatever the position of S25... but I reserve the right to be proven wrong about this!

--Tom
by tom_seddon
Fri Jul 17, 2020 1:00 am
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Re: Dead BBC B with apparent 81LS95 problem

Thanks for the comments. Good to be able to probably rule out the possibility of fakes! The ones I bought look to be NOS - they don't exactly look new, but, equally, they don't look obviously used. Regarding the type, I think they're right, at least in theory, as the type code and manufacturer match...
by tom_seddon
Thu Jul 16, 2020 12:42 am
Forum: 8-bit acorn hardware
Topic: Dead BBC B with apparent 81LS95 problem
Replies: 14
Views: 624

Dead BBC B with apparent 81LS95 problem

I bought a dead BBC B from eBay, that I'm trying to resurrect. Symptoms are that you turn it on, and it goes "brrrrrrrrrrrrr" forever. No beep, no display. My diagnosis tools are a cheap logic analyzer , a multimeter, cmorley's Tube bus snoop device, and a working BBC B ( that also has a thread here...
by tom_seddon
Tue Jul 14, 2020 2:31 am
Forum: programming
Topic: Filing systems and closing EXEC files
Replies: 6
Views: 243

Re: Filing systems and closing EXEC files

EDIT: how does this even work though?! OSFIND calls OSBYTE $77, and OSBYTE $77 calls OSFIND again... to close the same handle? I wonder how/why this works. Maybe this is the Master's OS being cleverer, and maybe it won't work on a model B. Ugh. Perhaps what I should actually be doing is what you su...
by tom_seddon
Tue Jul 14, 2020 1:23 am
Forum: programming
Topic: Filing systems and closing EXEC files
Replies: 6
Views: 243

Re: Filing systems and closing EXEC files

BeebLink tries to do a close spool/exec handle osbyte $77 when the spool or exec file handle is being closed: https://github.com/tom-seddon/beeblink/blob/5cf725407ea54f1400fc8ec24fde1182757e054c/rom/beeblink.s65#L3123 It doesn't do this on receipt of a close #0 - pretty sure this is a bug that needs...
by tom_seddon
Mon Jul 06, 2020 2:24 am
Forum: archive submissions
Topic: Misc BBC/Electron Roms, for checking
Replies: 43
Views: 5824

Re: Misc BBC/Electron Roms, for checking

Going through some stuff I bought from eBay: a ROM labeled DDOS 3.45, titled DDOS 3.x5, that doesn't match any of the existing ones I've got, nor anything from Wouter Scholten's ROM collection or the ZIPs in this thread. It is 3.45, but contains a couple of extra bytes at offset &190 and a NOP at &...
by tom_seddon
Sun Jul 05, 2020 11:08 pm
Forum: archive submissions
Topic: Misc BBC/Electron Roms, for checking
Replies: 43
Views: 5824

Re: Misc BBC/Electron Roms, for checking

Going through some stuff I bought from eBay: a ROM labeled DDOS 3.45, titled DDOS 3.x5, that doesn't match any of the existing ones I've got, nor anything from Wouter Scholten's ROM collection or the ZIPs in this thread. Judging by the numerous ROMs I seem to have calling themselves DDOS 3.x5 (and t...
by tom_seddon
Sun Jul 05, 2020 2:16 pm
Forum: wanted
Topic: Quest Mouse / Paint manual
Replies: 5
Views: 647

Re: Quest Mouse / Paint manual

I don't get any loaded automatically either - I get one row of solid red and one of solid white. Looks like you have to go to the I/O menu and load patterns by hand.

--Tom
by tom_seddon
Sun Jul 05, 2020 1:46 pm
Forum: archive submissions
Topic: AMX Mouse Software
Replies: 56
Views: 4832

Re: AMX Mouse Software

Scans of the Watford Stop Press manual here: http://ffe3.com/beeb/WafordStopPressManual.zip ZIPs of the ROMs and disks I've got attached. The two ROMs I've got are different from the images on Bill's disk, but I think the ROMs look more sensible. The differences are in STOPPR1: (- is the ROM, + is t...
by tom_seddon
Sun Jul 05, 2020 1:59 am
Forum: wanted
Topic: Quest Mouse / Paint manual
Replies: 5
Views: 647

Re: Quest Mouse / Paint manual

I've uploaded a scan here: http://ffe3.com/beeb/QuestPaintManual.zip

This manual came with a Beeb I got from eBay, that had a WE mouse and a Quest Paint 1.10 ROM.

--Tom
by tom_seddon
Tue Jun 30, 2020 9:50 pm
Forum: archive submissions
Topic: AMX Mouse Software
Replies: 56
Views: 4832

Re: AMX Mouse Software

- AMX Stop Press - I found a manual on eBay ( https://www.ebay.co.uk/itm/AMX-Stop-Press-2x-ROMs-2x-5-25-Discs-Manual/184183261954?hash=item2ae22d8b02:g:uNAAAOSw9-ZeT62W ) with the complete bundled software, but wondered if someone can help me out on this one I got a manual, 2 disks and 2 ROMs for W...
by tom_seddon
Sun Jun 28, 2020 12:51 am
Forum: 8-bit acorn hardware
Topic: BBC Master and Watford DFS 1.44
Replies: 8
Views: 312

Re: BBC Master and Watford DFS 1.44

Excellent, thanks very much for the link. I'd visited that site previously, but somehow managed to miss the Master-friendly DDFS. And after 5 minutes of fiddling about, I've now got a DDFS disk with 360 KB free on drive 0... something I don't think I've ever seen before! In principle, b2 supports th...
by tom_seddon
Sat Jun 27, 2020 2:31 am
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 16106

Re: b2 - new emulator

Pernod wrote:
Sat Jun 27, 2020 1:58 am
Is it a known issue that the cursor is incorrect in modes 3 and 6? Cursor end is 9 in those modes so seems to be missing a line.
Arrgh! Yes, it was... but no, it is not :lol: - I thought I'd fixed this!

Thanks for the report. I'll have a look at this this weekend.

--Tom
by tom_seddon
Sat Jun 27, 2020 1:38 am
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 16106

Re: b2 - new emulator

Have been playing with b2. Works nice on my Mac! Is it possible to let b2 work with my Hard Drive images I have from BeebEm? Good question! I'm afraid the current answer is no - but I do intend to support it in future! My current list of future things I plan to emulate can be found here: https://gi...
by tom_seddon
Sat Jun 27, 2020 1:32 am
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 16106

Re: b2 - new emulator

I've just tried b2, and I must say, I like the video output a lot more than BeebEm's - it looks much sharper and better defined. Though no co-pro support? Thanks for the kind words, and I hope you continue to enjoy using it. It doesn't support as wide a range of stuff as BeebEm, but what it does su...
by tom_seddon
Tue Jun 23, 2020 2:00 am
Forum: 8-bit acorn emulators
Topic: b-em & interleaved double-density files
Replies: 14
Views: 666

Re: b-em & interleaved double-density files

I'd always understood ssd and dsd to be for single density images only: .ssd is one side, image possibly truncated, always 10 sectors per track, and .dsd is two sides, side-interleaved, image possibly truncated, always 10 sectors per track. (The side interleaving comes from how DOS tools used to rea...
by tom_seddon
Sun Jun 21, 2020 8:13 pm
Forum: 8-bit acorn emulators
Topic: b-em & interleaved double-density files
Replies: 14
Views: 666

Re: b-em & interleaved double-density files

You may be right and it just needs a different extension - try .ddd? ((D)ouble sided, (D)ouble (D)ensity.) .ddd files have to be 720 KB (2 sides x 80 tracks x 18 sectors, sides interleaved), 360 KB (2 x 40 x 18), 640 KB (2 x 80 x 16) or 320 KB (2 x 40 x 16). There is also a single-sided equivalent, ...
by tom_seddon
Sun Jun 14, 2020 10:49 pm
Forum: 8-bit acorn emulators
Topic: Threads and emulators
Replies: 38
Views: 1389

Re: Threads and emulators

Regarding separating graphics and "the rest", b2 separates these at a point roughly equivalent to the Beeb's RGB plug: the graphics data is essentially a stream of 16 MHz samples of the R/G/B outputs from the RGB port and 2 MHz samples of the CRTC hsync/vsync outputs. So the emulation thread fetches...

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