Search found 361 matches

by tom_seddon
Sat Feb 22, 2020 11:33 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 908
Views: 135923

Re: Wires? Pah.....

A very interesting discussion! I'd never thought to try "*HELP .". I suspect BeebLink won't respond at all. There's a special case for the first char, so it specifically won't match a single . against anything: https://github.com/tom-seddon/beeblink/blob/5cf725407ea54f1400fc8ec24fde1182757e054c/rom/...
by tom_seddon
Fri Feb 21, 2020 10:50 pm
Forum: software: other
Topic: Updated BASIC Editor
Replies: 54
Views: 5734

Re: Updated BASIC Editor

Hi Robin, 1) Do all of the commands documented in the Basic Editor V1.32 PDF Manual still work exactly as documented? The command mode commands should all behave the same, but some of the edit mode keyboard shortcuts are different. Which leads us neatly on to... 2) Is there an "addendum" document to...
by tom_seddon
Sun Feb 09, 2020 11:31 pm
Forum: software: other
Topic: Updated BASIC Editor
Replies: 54
Views: 5734

Re: Updated BASIC Editor

Hi Tom love the new Basic Editor One question, i am programming in control basic Does the Editor simply act as a simple word processor or does it always call basic when Run is used Is there a way of calling Control Basic when Run is used I supposed i could save the edited file and then run it from ...
by tom_seddon
Thu Feb 06, 2020 12:09 am
Forum: hardware
Topic: BBC B CRTC problem?
Replies: 8
Views: 379

Re: BBC B CRTC problem?

Thanks for the suggestions. The Beeb itself otherwise runs fine, and starts up in BASIC with S25 in any position. Nothing obviously wrong with the CPU's view of things. I doubt the $300 is the problem area as the fault is also visible with my code, which runs with interrupts disabled, setting the mo...
by tom_seddon
Tue Feb 04, 2020 1:01 am
Forum: hardware
Topic: BBC B CRTC problem?
Replies: 8
Views: 379

Re: BBC B CRTC problem?

it's producing bogus addresses, in a way that stops the RAM refresh working properly with the bitmap-type address translation, but doesn't stop it working with the teletext-type address translation Actually, thinking about it, I'm not sure about this - as I've seen the memory faults occur even with...
by tom_seddon
Tue Feb 04, 2020 12:48 am
Forum: hardware
Topic: BBC B CRTC problem?
Replies: 8
Views: 379

BBC B CRTC problem?

Once warmed up, my BBC B behaves a bit oddly. In bitmap modes, some addresses don't reliably hold their values (judging by my memory tester, seems to be usually ones ending in %111011, but it does vary), and occasionally, teletext or bitmap, the video output goes... weird. Here's the BBC Computer 32...
by tom_seddon
Mon Feb 03, 2020 11:07 pm
Forum: hardware
Topic: Memory tester
Replies: 0
Views: 159

Memory tester

My BBC B has some kind of sporadic memory error. MartinB's memory test tool found no faults, so I decided I'd write another one: https://github.com/tom-seddon/beeb_memory_tester It checks 16 K at a time (the code lives in the other 16 K), and it runs entirely without the stack, so every byte of memo...
by tom_seddon
Sat Jan 18, 2020 12:28 am
Forum: emulators
Topic: MAME: IDE/SCSI and other large storage devices
Replies: 47
Views: 1984

Re: MAME: IDE and other large storage devices

I'm surprised any load at all myself! What's PAGE/OSHWM in this situation? Isn't it, like, $1d00, or something? (Friends don't let friends use ADFS on a BBC B/B+ with no second processor. How many lines of code do you have room for before you can't even enter mode 0? I think the technical term would...
by tom_seddon
Sun Jan 05, 2020 4:22 pm
Forum: hardware
Topic: How many 8bit beeb basic machines
Replies: 19
Views: 567

Re: How many 8bit beeb basic machines

There's a serial number thread here, with production estimates: viewtopic.php?t=4321

Doesn't include the Z88 though!

--Tom
by tom_seddon
Sat Jan 04, 2020 10:41 pm
Forum: software: other
Topic: ADFS Versions
Replies: 4
Views: 1562

Re: ADFS Versions

I've been reading through https://stardot.org.uk/forums/viewtopic.php?t=13082 - hoglet mentions that Electron ADFS 1.0x had various bugs, presumably fixed in BBC B/B+ ADFS 1.3x, which he's based his updated versions on. Aside from what's noted here in this thread (e.g., the 32016 fix), are there any...
by tom_seddon
Fri Dec 20, 2019 11:06 pm
Forum: general
Topic: Today I received.....
Replies: 5664
Views: 478069

Re: Today I received.....

Does it make much of a difference in practice if they're 48 tpi rather than 96 tpi? I've got about 100 5.25" disks, all 30+ years old, acquired at various points over the years. I throw them out on a case-by-case basis, when I find one that's obviously mouldy or has a case that's puffy or falling ap...
by tom_seddon
Sun Dec 15, 2019 12:49 am
Forum: projects
Topic: BeebLink
Replies: 56
Views: 4538

Re: BeebLink

UPURS support is now non-experimental, as it's had a good amount of testing over the past 3 months, with no problems noted.

I'm now using UPURS BeebLink on my BBC B, so it will be getting ongoing use.

--Tom
by tom_seddon
Sun Dec 15, 2019 12:35 am
Forum: projects
Topic: BeebLink
Replies: 56
Views: 4538

Re: BeebLink

It absolutely would be. Google's rules in a nutshell for open source contributions are (a) it has to be under a real open source license and (b) it has to be clear that Google owns the copyright to what I'm writing. Being a contributor on GH repos is totally fine. That said, I'll send you a PR for ...
by tom_seddon
Sun Dec 08, 2019 12:33 am
Forum: software: other
Topic: BooBip RTool 1.04 released
Replies: 13
Views: 544

Re: BooBip RTool 1.3b released

Just upgraded my B's ROMFS copy of RTOOL now. I tried it on my Master too - works fine! - and after Kieran's comments I also tried it on my B with PAGE=&2100 - and no obvious problems noted.

--Tom
by tom_seddon
Sat Dec 07, 2019 4:43 pm
Forum: software: other
Topic: BooBip RTool 1.04 released
Replies: 13
Views: 544

Re: BooBip RTool 1.3 released

Excellent - this looks like it fixes a problem I was having on my Master 128 with ver 1.01, that I only recently figured out - OSWRCH can enable IRQs, so if $f4 isn't updated when printing the ROM title, you can get bogus results. I will be updating later! (Yes, I know you don't really need RTOOL on...
by tom_seddon
Thu Dec 05, 2019 9:14 pm
Forum: hardware
Topic: Info please! Acorn's in-house large-memory 6502 co-pro
Replies: 99
Views: 5391

Re: Info please! Acorn's in-house large-memory 6502 co-pro

I think it's far less useful if it can't present a flat memory model. But I'm not sure how the timing could work to handle the bit 15-16 carry (which as you say would only need to check a single bit discrepancy). Interesting snippet about BAS128 from http://www.rougol.jellybaby.net/meetings/2012/Pa...
by tom_seddon
Sat Nov 30, 2019 8:49 pm
Forum: hardware
Topic: 6502 2nd Processor
Replies: 9
Views: 665

Re: 6502 2nd Processor

KenLowe wrote:
Sat Nov 30, 2019 3:43 pm
I also notice that my board is missing the 74S74 IC27 that is on the Issue 4 board. I feel robbed :lol: :lol: .
I think there's somebody else on here with another one like this one - I'm sure I remember a photo of the circuit board with the missing chip and fuse.

--Tom
by tom_seddon
Sat Nov 30, 2019 1:19 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 24 to 26 January 2020: NOW FULL
Replies: 175
Views: 7295

Re: ABUG SOUTH 24 to 26 January 2020 (Hampshire) BOOKING THREAD

Full table for all 3 days please. Thanks for organising this.

--Tom
by tom_seddon
Fri Nov 29, 2019 9:52 pm
Forum: hardware
Topic: Info please! Acorn's in-house large-memory 6502 co-pro
Replies: 99
Views: 5391

Re: Info please! Acorn's in-house large-memory 6502 co-pro

Could it be the mystery version of BASIC whose existence hoglet proposed?

--Tom
by tom_seddon
Mon Nov 25, 2019 11:37 pm
Forum: hardware
Topic: Info please! Acorn's in-house large-memory 6502 co-pro
Replies: 99
Views: 5391

Re: Info please! Acorn's in-house large-memory 6502 co-pro

hoglet wrote:
Mon Nov 25, 2019 6:52 pm
BigEd wrote:
Mon Nov 25, 2019 6:50 pm
I hadn't thought that it might not do a RAM check. Does the ordinary 64k 6502 copro do a RAM check?
I don't think so.
JGH has a disassembly of the Tube parasite OS: http://mdfs.net/Software/Tube/6502/Clnt65v1.src - looks like the 64K message is hard-coded.

--Tom
by tom_seddon
Mon Nov 25, 2019 9:38 am
Forum: hardware
Topic: Info please! Acorn's in-house large-memory 6502 co-pro
Replies: 99
Views: 5391

Re: Info please! Acorn's in-house large-memory 6502 co-pro

This thread was mentioned on an ebay listing for an "extended 6502 second processor": https://www.ebay.co.uk/itm/Acorn-Extend ... 3412375870

--Tom
by tom_seddon
Fri Nov 22, 2019 10:55 am
Forum: software: classic games
Topic: 1985 Contraption (Icon Audiogenic Software Ltd)
Replies: 7
Views: 509

Re: 1985 Contraption (Icon Audiogenic Software Ltd)

Stock Car, Kix, Banjax, Holed Out, Vindaloo, Karate Combat, Rig Attack - think these are all Mode 1 too.

--Tom
by tom_seddon
Thu Oct 31, 2019 1:03 pm
Forum: emulators
Topic: ACCCON TST
Replies: 5
Views: 820

Re: ACCCON TST

MOS 3.50 has code in these pages.

Good point about pages $fc and $fd - I'd always assumed it was all 3 pages that were paged out, but come to think of it I'm not sure I ever actually tested this...

--Tom
by tom_seddon
Mon Oct 28, 2019 8:16 pm
Forum: hardware
Topic: Loading a ROM into SW Ram - basics
Replies: 39
Views: 1190

Re: Loading a ROM into SW Ram - basics

That BASICED 'rom image' isn't a rom image - it looks like its the source code or something, possibly from github or somewhere? I can't tell how you've arrived at the file but it's just wrong! Have you selected the wrong file to download perhaps? For example here's the first few bytes..... <!DOCTYP...
by tom_seddon
Sun Oct 27, 2019 12:36 am
Forum: software: other
Topic: Updated BASIC Editor
Replies: 54
Views: 5734

Re: Updated BASIC Editor

There's a new version of the BASIC editor out! Get ver 1.44 from GitHub: https://github.com/tom-seddon/basic_editor/tree/master/releases What's new: Reinstate old CTRL+up/down behaviour Fix screen drawing bug More reliably clear screen before returning to command mode Switch to Mode 135/Mode 7 when ...
by tom_seddon
Mon Oct 21, 2019 10:47 pm
Forum: software: other
Topic: ADFS Compaction
Replies: 1
Views: 277

Re: ADFS Compaction

Interesting question! There's one free spaces array for the whole disk, and it's only 82 entries long - which I think this is the key to doing it on the 8-bit systems with bounded memory consumption. Start out by compacting the used areas. No need to pay attention to where anything in particular is,...
by tom_seddon
Sat Oct 12, 2019 12:54 am
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 908
Views: 135923

Re: Wires? Pah.....

I used hoglet's routines from UPURSFS in the end, and BeebLink now has UPURS cable support: https://stardot.org.uk/forums/viewtopic.php?f=53&t=15605 (Max throughput is ~8.5 KBytes/sec - nowhere near as fast as the Tube serial adapter, but I'm still happy with the performance overall. The lack of see...
by tom_seddon
Sat Oct 12, 2019 12:14 am
Forum: projects
Topic: BeebLink
Replies: 56
Views: 4538

Re: BeebLink

On an experimental basis, BeebLink now supports the UPURS cable. Thanks to MartinB, hoglet and sweh for the UPURSFS transfer routines, and thanks to kieranhj for the loan of a cable. Throughput is not as good as when using the Tube serial adapter, but everything else works the same! UPURS support is...
by tom_seddon
Thu Oct 10, 2019 5:46 pm
Forum: hardware
Topic: HostFS+TCPIP
Replies: 68
Views: 2439

Re: HostFS+TCPIP

Sign me up for a board too! I'd like to add support for this to BeebLink. Not sure what the Beeb-side UI will look like yet, but I'll be having a think.

--Tom
by tom_seddon
Thu Oct 03, 2019 6:34 pm
Forum: emulators
Topic: Request for testers for quick but fascinating test case
Replies: 36
Views: 1909

Re: Request for testers for quick but fascinating test case

Master 128, VL68C45, CMD G65C22

Code: Select all

2 CYCLE STRETCH: 255
3 CYCLE STRETCH: 255
--Tom