Search found 1214 matches

by Pernod
Sat Jul 14, 2018 8:58 pm
Forum: software: other
Topic: Electron Demos
Replies: 7
Views: 132

Re: Electron Demos

I saved the files to UEF for you using BeebEm. This was never intended to be distributed on tape so the tape loading corrupts the screen.
by Pernod
Sat Jul 14, 2018 7:25 pm
Forum: software: other
Topic: Electron Demos
Replies: 7
Views: 132

Re: Electron Demos

Bones is on my Animation disc at viewtopic.php?f=32&t=5802&p=108594#p54096
by Pernod
Wed Jul 04, 2018 6:46 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

There are a few different versions of the System Econet ROM out there: - System/3 Econet 1.48 - Econet 2.40 - Econet 3.40 - Econet 3.50 The 2/3 versions are mapped at &E000, where would these be inserted in a System 3? I'd assume in an 8K Static RAM board IC17 with the ROM region links set to &E000-...
by Pernod
Sun Jul 01, 2018 11:37 am
Forum: general
Topic: BBC releases computer history archive
Replies: 90
Views: 1826

Re: BBC releases computer history archive

Classic clip... My dad's standard reply to anyone having a problem became 'Have you got a VIC-20?'.

https://computer-literacy-project.pilot ... 5fb3049258
by Pernod
Wed Jun 27, 2018 11:10 am
Forum: hardware
Topic: Missing old/new Electron Expansions
Replies: 76
Views: 1138

Re: Missing old/new Electron Expansions

I should think reverse engineer pegasus would be fairly easy (well maybe not for me) I emulate the Pegasus in MAME, it's a fairly standard 1770 implementation at &FCC4-C7, with the following control latch at &FCC0: bit 0, 1: drive select bit 2: side select bit 3: density bit 4: send DRQ to NMI sign...
by Pernod
Sun Jun 24, 2018 7:36 pm
Forum: upcoming and recent events & exhibitions
Topic: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon
Replies: 26
Views: 723

Re: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon

kieranhj wrote:
Sun Jun 24, 2018 7:34 pm
Oops, yes I can sort that. Not sure what happened there , must be a dodgy disc template in the build process.
Thanks, I remember White Light having the same problem so probably an issue with whatever you use to create the image.
by Pernod
Sun Jun 24, 2018 6:48 pm
Forum: upcoming and recent events & exhibitions
Topic: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon
Replies: 26
Views: 723

Re: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon

Minor comment, but could you fix the downloadable SSD to conform to DFS. It's missing the sector count at offset &106-&107. A Watford DFS reports 00 tracks, and MAME requires this to determine the format of the file whether 40/80 tracks. For 40 tracks replace bytes &106-&107 with &31, &90. For 80 tr...
by Pernod
Sun Jun 24, 2018 10:38 am
Forum: upcoming and recent events & exhibitions
Topic: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon
Replies: 26
Views: 723

Re: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon

kieranhj wrote:
Sun Jun 24, 2018 10:34 am
For those interested, and who don't mind the magic being spoiled, I will post some technical details on a thread in the programming section soon.
I'm curious as to what it does differently depending on emulator vs real hardware option.
by Pernod
Thu Jun 21, 2018 3:18 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 5
Views: 404

Re: Atom ROMs

The MYSTERY is ONLI, whereas ONLI is MYSTERY mirrored. ONLI is mentioned for the System 3, could this be it? acornsystem1and3.jpg Also, from the Acorn Computer Systems Catalogue: ONLI Extension This is an additional 2K byte program which adds statements to BASIC allowing the control of experiments i...
by Pernod
Thu Jun 21, 2018 1:01 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

I've got a few more somewhere, but I've started tidying them to here . Thanks, had already found those. Attached a utilities disc which contains some BASIC programs. It probably came from somewhere on the forum and claims to be for System 3. They appear to be for the 40 column card, but don't seem ...
by Pernod
Wed Jun 20, 2018 10:58 am
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

It depends on the key, e.g. pressing and releasing 1,2 or 3 then BREAK tries to boot but pressing and releasing Q, W or E then BREAK gets back to the prompt. Of course, depending on key>='@'. The only thing I have for it is the Level II file server which I posted here some time ago: https://stardot...
by Pernod
Tue Jun 19, 2018 9:17 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

I have a System 5 Excellent, and thanks for the clarifications. What about on pressing BREAK? If pressing BREAK straight after startup at prompt I'd expect to get the prompt again, but if any other input before BREAK then tries to boot? Do you have any floppies worth imaging for it, maybe an offici...
by Pernod
Tue Jun 19, 2018 8:34 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

The keyboard implementations slightly differ between the System 3 and 5. The System 3 uses the 6502 board with keyboard connected to PA of the 6522. PA0-PA6 are ASCII of key presses and PA7 is STROBE indicating when pressed/released. The System 5 uses the 6502A board with keyboard again connected to...
by Pernod
Tue Jun 19, 2018 7:04 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

From your disassembly:

Code: Select all

BIT &0E21:BVS LFF6D      :\ If key>='@' or no key pressed, skip past boot
LDX #&04                 :\ Normally SPACE-BREAK to boot
Does this mean that if no key is pressed then &0E21 is &FF?
by Pernod
Tue Jun 19, 2018 5:06 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

Checking the code I believe it does. On Reset if no key is pressed it goes to the DOS prompt. If SPACE is pressed the disk in drive 0 is examined for the boot option and a BOOT file. I'll take a closer look at your source. If I place &FF in the keyboard buffer at reset then I get the prompt, otherw...
by Pernod
Tue Jun 19, 2018 1:43 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 18
Views: 743

Re: MAME: Acorn System

Does anyone have a working System 3/5 machine? I need to clarify some behaviour. In Acorn DOS without a disc in the drive and I press RETURN the machine will wait for the floppy READY line to be asserted, loops indefinitely. Is this expected? With a disc in the drive it will respond with 'Command?' ...
by Pernod
Sat Jun 16, 2018 2:05 pm
Forum: for sale / freebies
Topic: Moving House - Items to go
Replies: 35
Views: 1406

Re: Moving House - Items to go

Watford Electronics Diagnostics Utility Disk & Manual. No idea if it works, but might be of interest to someone. Would be nice if whomever gets this could image the disk and scan the manual. Free to a good home, either collect or you cover the cost of P&P. I'll take this please. PM me P&P details.
by Pernod
Thu Jun 14, 2018 1:51 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 60
Views: 1747

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

There are a handful of ROMs I'd like to see dumped during this event, assuming someone will have suitable equipment there. Can I put forward a wishlist? No harm in asking! :) Presumably bar a Beeb and the actual ROM..and means of exporting to modern storage, which many of us have.. only a ROM dump ...
by Pernod
Wed Jun 13, 2018 3:07 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

Just whether either of IRQ and NMI lines are connected. INTRQ -> IC6-LS244 pin 17 DRQ -> IC6-LS244 pin 2 The outputs from those buffers go to Pin 18 to D7, Pin 3 to D6. This suggests to me that the DRQ and INTRQ are polled by reading an IO register which triggers the gate on the LS244. There is als...
by Pernod
Tue Jun 12, 2018 9:07 pm
Forum: general
Topic: The Adventure Game (BBC TV, 1980-86): Beebs on TV
Replies: 18
Views: 266

Re: S1E4

lurkio wrote:
Tue Jun 12, 2018 8:44 pm
Series 1, Episode 4
vlcsnap-2017-08-08-16h43m10s330.jpeg
It's a HP9845, I used to work with them back in the 90's.
by Pernod
Tue Jun 12, 2018 8:54 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

Is there any brand/model number on the keyboard? I'm currently using a generic ASCII implementation which produces a few different codes, so need to re-implement this.
by Pernod
Tue Jun 12, 2018 6:16 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

In modes 0..6 the screen fills up and it doesn't scroll or do anything cursor dissappears off the bottom and as you say you have to cls to get it back. In mode 7 it stops at the last line, further printing repeatedly over-writes the last line of the screen, hitting esc returns you to the prompt on ...
by Pernod
Tue Jun 12, 2018 3:24 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

I had a play last night and couldn't get it to display anything :( I'm using a standard Beeb SCART lead which worked** on the Standard video card, I did put a scope on the connector and I am getting a sync signal just no activity on the video (or it's all black!). I'll try having a read of the manu...
by Pernod
Tue Jun 12, 2018 12:34 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 60
Views: 1747

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

No promises, but I'll try to attend as a visitor since I won't be bringing anything. Not sure which day(s) yet either.

There are a handful of ROMs I'd like to see dumped during this event, assuming someone will have suitable equipment there. Can I put forward a wishlist?
by Pernod
Tue Jun 12, 2018 12:32 am
Forum: software: classic games
Topic: Trying to locate old game "Caves"
Replies: 7
Views: 371

Re: Trying to locate old game "Caves"

Rather than make a new topic, I might as well add to this one: there was a game which may or may not have been Master-exclusive which involved a bouncing ball from an overhead view. You could control the ball in 8 directions, and it would have to be over a ground tile when it bounced. The ground ti...
by Pernod
Mon Jun 11, 2018 8:10 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

Crystal appears to be 14MHz, I suspect IC2, IC3 and IC8 divide it down, will measure what is on the CK pin of the video chip later. I'm assuming a divider by 8. R17 = Brown, Black, Yellow = 100K R16 = Yellow, Violet, Brown = 470R C10 = 4.7uf (I think) That would according to this site : http://www....
by Pernod
Mon Jun 11, 2018 4:15 pm
Forum: archive submissions
Topic: CMS system roms.
Replies: 30
Views: 1303

Re: CMS system roms.

Could I request some more info... - photos of the HiRes graphics board, specifically the crystal (probably 1.750MHz) - photo of HiRes board output. Use *GDP at BASIC prompt and do a few COLOUR changes. - photo of machine startup - photo of output from command J in monitor In addition to the above t...
by Pernod
Sat Jun 09, 2018 6:22 pm
Forum: archive submissions
Topic: CMS system board PROM.
Replies: 3
Views: 153

Re: CMS system board PROM.

Thanks for this, not decoded one of these before so is an interesting task. So far I've confirmed that CPU addresses 0x0000-0x7fff always select the RAM in M1 as suspected, regardless of paging register. Region 0x8000-0xbfff is dependant on paging register, 0 selects M4, 1 selects M3, 2 selects M2, ...
by Pernod
Wed Jun 06, 2018 8:07 pm
Forum: emulators
Topic: MAME: Touchscreen
Replies: 4
Views: 111

Re: MAME: Touchscreen

I don't have the firmware, but I know Matt Godbolt managed to get it working recently (you can see it here if you SHIFT+BREAK then use a mouse and left-click to act as the touch-screen: https://bbc.godbolt.org/?autoboot&disc=https://dl.dropboxusercontent.com/s/39mclkwmu1j4gj1/Microvitec-Touchtec-50...