Search found 444 matches

by tom_seddon
Wed Jan 27, 2021 12:38 am
Forum: 8-bit acorn hardware
Topic: Replacement black plastic BBC keyboard surround
Replies: 52
Views: 1761

Re: Replacement black plastic BBC keyboard surround

I'd be interested in one! I've got an issue 3 case that's been missing its surround for years...

--Tom
by tom_seddon
Sat Jan 23, 2021 9:27 pm
Forum: wanted
Topic: WD1772 FDC IC
Replies: 3
Views: 157

Re: WD1772 FDC IC

Looks like https://www.exxoshost.co.uk/atari/store2/ has 1772s in stock.

--Tom
by tom_seddon
Sat Jan 16, 2021 12:00 am
Forum: archive submissions
Topic: Exmon II 2.02 alternative version
Replies: 10
Views: 463

Re: Exmon II 2.02 alternative version

Looks like 2.02 does support the 65c02 opcodes on the Master. Try disassembling the IRQ routine (E5FF in MOS 3.20) - it correctly handles the phx/phy and ply/plx instructions. --Tom P.S. If I get far enough with my disassembly, perhaps it'll turn out it could be modified to support the undocumented ...
by tom_seddon
Mon Jan 11, 2021 10:54 pm
Forum: 8-bit acorn hardware
Topic: Torch Z80 board
Replies: 6
Views: 321

Re: Torch Z80 board

IDE cable wise if the 40 pin ones work then the 80 line (but still 40 pin) ones should hopefully be ok as I think the additional lines are just grounded ones to reduce noise. UDMA cables are supposed to have all the ground pins wired together - they're not straight through like the IDE ones. --Tom
by tom_seddon
Wed Jan 06, 2021 7:48 pm
Forum: programming
Topic: BASIC assembler weirdness
Replies: 12
Views: 379

Re: BASIC assembler weirdness

tricky wrote:
Wed Jan 06, 2021 7:12 pm
LDA data,x
But data isn't a zero page address... this code is at least slightly subtle!

--Tom
by tom_seddon
Wed Jan 06, 2021 6:43 pm
Forum: programming
Topic: BASIC assembler weirdness
Replies: 12
Views: 379

Re: BASIC assembler weirdness

But all references to as-yet-undefined zero page addresses are by instructions that have no zero page form!

--Tom
by tom_seddon
Sun Jan 03, 2021 9:32 pm
Forum: 8-bit acorn software: other
Topic: 68k BASIC
Replies: 6
Views: 436

Re: 68k BASIC

There's possibly an Atari ST BBC BASIC, but without anything to run it on I don't know if this is it. The PRG contains the string "This program was written by Tris 'Mad' Mabbs" - I think this will be the same one I tried to use in probably 1993. I found it extremely buggy, rather slow, an...
by tom_seddon
Sat Jan 02, 2021 12:02 am
Forum: archive submissions
Topic: Exmon II 2.02 alternative version
Replies: 10
Views: 463

Re: Exmon II 2.02 alternative version

Both versions of 2.02 are dated 1990, did Beebug really continue updating Exmon this late? The earlier 2.01 was 1987, which introduced new features for the Master. Are we missing a 2.00? I'd really like to understand what the 2.02 differences actually do. They both look official so it's odd that th...
by tom_seddon
Wed Dec 30, 2020 8:21 pm
Forum: 8-bit acorn software: other
Topic: TECHNOMATIC EPROMER II EPROM PROGRAMMER
Replies: 11
Views: 1588

Re: TECHNOMATIC EPROMER II EPROM PROGRAMMER

Slightly different EpromRyter manual, as promised - "(C) GsoFt/Technomatic 1987. First published in September 1987 by Technomatic/GsoFt". --Tom P.S. the attachment is a PDF of scaled-down jpegs, shrunk so it fits within the forum attachment limit. Looks quite readable, but if you want the...
by tom_seddon
Wed Dec 30, 2020 7:38 pm
Forum: archive submissions
Topic: Exmon II 2.02 alternative version
Replies: 10
Views: 463

Exmon II 2.02 alternative version

Contents of an original-looking ROM (looks like BeebMaster's ROM , but with a gold sticker). Comparing it to Exmon II 2.02 from Wouter Scholten's archive. The meaningful differences appear to be in this routine. (I got started on a disassembly of the archived version of Exmon II a while ago, but did...
by tom_seddon
Wed Dec 30, 2020 6:31 pm
Forum: 8-bit acorn software: other
Topic: TECHNOMATIC EPROMER II EPROM PROGRAMMER
Replies: 11
Views: 1588

Re: TECHNOMATIC EPROMER II EPROM PROGRAMMER

Slightly different EpromRyter manual, as promised - "(C) GsoFt/Technomatic 1987. First published in September 1987 by Technomatic/GsoFt". --Tom P.S. the attachment is a PDF of scaled-down jpegs, shrunk so it fits within the forum attachment limit. Looks quite readable, but if you want the ...
by tom_seddon
Wed Dec 30, 2020 5:09 pm
Forum: archive submissions
Topic: CommSoft 8.6h/Modem
Replies: 1
Views: 113

CommSoft 8.6h/Modem

This 8.6h is different from the other ones I found. After doing some hex dump diffs, nothing cleverer than that, it looks like the ROM might be in 2 parts: $3c6e bytes of shared code, followed by what might be some kind of device driver type of affair. The driver section looks to starts with a devic...
by tom_seddon
Wed Dec 30, 2020 4:21 pm
Forum: archive submissions
Topic: ADT 1.20 alternative version
Replies: 1
Views: 153

ADT 1.20 alternative version

Found in a ROM I got with some Beeb stuff. It claims to be ADT 1.20, but it doesn't quite match the ADT 1.20 I've already got, part of Wouter Scholten's ROM collection. There's not actually all that much that's different. Just a few bytes at $dfd. adt-wouter: 00000DFD: D0 08 C4 80 D0 04 E4 7F F0 20 ...
by tom_seddon
Wed Dec 30, 2020 12:54 am
Forum: archive submissions
Topic: AMX Mouse Software
Replies: 93
Views: 8466

Re: AMX Mouse Software

Found this while going through some stuff: Watford Page Fonts, not obviously already archived. No idea how you use it, but I found a reference to it in a late 80s Watford advert - "PAGE-FONTS - Over 20 Fonts for use with AMX Pagemaker" - so this thread seems like the best place for it. --T...
by tom_seddon
Sun Dec 20, 2020 11:41 pm
Forum: programming
Topic: 6502 hex to ascii
Replies: 1
Views: 233

Re: 6502 hex to ascii

There's a similar routine, with a bit of explanation, here: http://www.obelisk.me.uk/6502/algorithms.html (search for "One final odd use of decimal arithmetic")

(The one you give is much better, though! Since it uses CMP rather than ADC, there's no CLC required. Very clever.)

--Tom
by tom_seddon
Sun Dec 20, 2020 4:07 pm
Forum: 8-bit acorn software: other
Topic: .inf access byte question
Replies: 26
Views: 720

Re: .inf access byte question

I've always assumed it meant the file's attributes, as that's the place where L or Locked goes for DFS files. If adding alternative syntaxes, maybe it's worth copying CRC= and BOOT= and adding a prefix, so it's always unambiguous? Then attributes will always be a hex value or "L" - or you ...
by tom_seddon
Mon Nov 30, 2020 10:24 pm
Forum: programming
Topic: Quick Sideways RAM question
Replies: 7
Views: 452

Re: Quick Sideways RAM question

BRK is the only thing you have to take a bit of care over, as the BRK (and code, and text, and terminating BRK...) has to be in main memory so that language ROM can access it. The usual thing for non-language code running from a ROM is to copy the BRK+code+text+BRK to $100, then do a jmp $100. The M...
by tom_seddon
Sun Nov 08, 2020 10:09 pm
Forum: new ideas wishlist & general chat
Topic: Knight Lore
Replies: 5
Views: 546

Re: Knight Lore

There's a disassembly at http://www.level7.org.uk/miscellany/ (along with a few others!)

--Tom
by tom_seddon
Sun Oct 18, 2020 9:57 pm
Forum: archive requests
Topic: DataGem by Gemini
Replies: 13
Views: 1483

Re: DataGem by Gemini

I've got the ROMs for this. No other materials, though - no carrier board, no manual, no disks!

One ROM appears to be just FFs, so I assume it's erased itself over the years. The other is a match for Bill's encrypted DataGem 2039 B.

--Tom
by tom_seddon
Thu Oct 15, 2020 3:40 pm
Forum: 8-bit acorn emulators
Topic: 6502 cycle-level instruction detail
Replies: 19
Views: 1099

Re: 6502 cycle-level instruction detail

The Synertek 6502 hardware manual (there's a copy on 6502.org) has tables at the back for the bus accesses for each type of instruction.

--Tom
by tom_seddon
Fri Oct 09, 2020 3:29 pm
Forum: 8-bit acorn hardware
Topic: Technomatic Newbie Eprom Programmer Saga
Replies: 5
Views: 288

Re: Technomatic Newbie Eprom Programmer Saga

just installed a Technomatic EPROMER II Eprom Programmer into BBC Model B and software disk installed on MMC drive. Looks like you have an undumped version of Epromer II v2.5, we currently only have v2.3 archived. Would yo be able to dump it and attach here? It might be $.rprom2 on the disk I poste...
by tom_seddon
Tue Sep 15, 2020 8:24 pm
Forum: programming
Topic: Using a Mac or PC for BBC games authoring
Replies: 47
Views: 2575

Re: Using a Mac or PC for BBC games authoring

having managed to get an SSD image working on WIndows, I have almost got it on the Mac. I can't seem to get BeebEm or b2 to automatically reload the disc. In the case of BeebEm on the Mac, I get an error: "The document “droid.ssd” could not be opened. BeebEm5 cannot open files in the “Document...
by tom_seddon
Sat Sep 12, 2020 11:39 pm
Forum: programming
Topic: Zalaga
Replies: 5
Views: 607

Re: Zalaga

Searching this site there seem to be issues in the past with the game using 65C02 op codes, but my beeb has a 65C02, but the beebem setup I used was bog standard. I think Zalaga uses 6502 illegal opcodes & therefore (unpatched) doesn't work on a 65C02. I believe it doesn't run on a Master for t...
by tom_seddon
Wed Sep 09, 2020 1:00 am
Forum: programming
Topic: Using a Mac or PC for BBC games authoring
Replies: 47
Views: 2575

Re: Using a Mac or PC for BBC games authoring

This is the sort of workflow b2 is designed to (hopefully) work well with. The way I do this on Mac OS is to use the HTTP API, as documented (if perhaps a bit tersely...) here: https://github.com/tom-seddon/b2/blob/master/doc/Debug-version.md#http-api The intended workflow here is to leave b2 perman...
by tom_seddon
Wed Sep 09, 2020 12:30 am
Forum: scanning of books, magazines, ads and letters
Topic: BBC Master Reference Manual [Remastered PDFs]
Replies: 7
Views: 911

Re: BBC Master Reference Manual [Remastered PDFs]

+1 - this is great, thank you. An excellent (and searchable) replacement for the enormous PDF (of not-quite-aligned images) that I've been using so far!

--Tom
by tom_seddon
Thu Sep 03, 2020 11:50 pm
Forum: programming
Topic: The NMI is (almost) a lie!
Replies: 2
Views: 396

The NMI is (almost) a lie!

The CMOS CPUs have a lot of NOPs, with the 1 cycle ones being particularly interesting. 1-cycle instructions aren't super easy to fit into the 6502's execution model, so clearly a bit of shoehorning was required, and they had to shave off some bits to make them fit. Like the bit where it checks for ...
by tom_seddon
Fri Aug 28, 2020 11:17 pm
Forum: 8-bit acorn hardware
Topic: Looking for a cheap BBC B
Replies: 16
Views: 1705

Re: Looking for a cheap BBC B

I have a BBC B issue 3 and issue 7 PCBs, is there a document that details the changes in the BEEB PCB versions? There's a summary in the BBC Micro Service Manual Oct 1985 Section 1, available from Chris's Acorns: http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Manuals.html#SM Not ment...
by tom_seddon
Thu Aug 27, 2020 9:11 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 24
Views: 1938

Re: Rapid not selling 60/40 to general punters anymore?

It's not the requested brand, but you can get lead solder from https://www.cricklewoodelectronics.com/Solder-60-Tin-40-Lead-0.7m-diameter-100grams.html I also bought some from Amazon - https://www.amazon.co.uk/gp/product/B0001P0GLW - but it's rather expensive, even if it did arrive quickly. Seems a ...
by tom_seddon
Wed Aug 26, 2020 12:37 am
Forum: 8-bit acorn hardware
Topic: BBC Model B - new keyboard connector?
Replies: 25
Views: 1084

Re: BBC Model B - new keyboard connector?

I use dupont cable, about 25 cm long... doesn't seem to be a problem. I think my setup involves 3 strips of stuck-together wires, so it's not too much of a forest inside. Though it does look a bit messy. Unplugging the keyboard is a lot more hassle, as there's no longer just one solid plug you can p...
by tom_seddon
Tue Aug 25, 2020 3:35 pm
Forum: 8-bit acorn emulators
Topic: MAME: Emulating FDC Boards
Replies: 62
Views: 10554

Re: MAME: Emulating FDC Boards

Pernod wrote:
Sat Aug 15, 2020 1:44 am
We currently only have a dump of UDM DDFS 2.00. There are earlier versions out there if anyone has one, specifically looking for 0.98 and maybe 1.1.
Beeb apparently with UDM DFS 1.10 up for sale on eBay: https://www.ebay.co.uk/itm/BBC-32K-micr ... 4415544379

--Tom

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