Search found 1099 matches

by SarahWalker
Thu Nov 08, 2018 6:19 pm
Forum: hardware
Topic: MEMC nibble mode ROM access / ROM emulation
Replies: 4
Views: 171

Re: MEMC nibble mode ROM access / ROM emulation

steve3000 wrote:
Thu Nov 08, 2018 12:39 am
As I recall the ROM access speed on startup is always the slowest - 450ns.
On MEMC reset, yes. RISC OS will measure memory speed during POST and choose a more appropriate setting; on an 8 MHz machine it will select 200ns.
by SarahWalker
Thu Nov 01, 2018 7:39 pm
Forum: software
Topic: RISC OS relicensed: now under Apache 2.0!
Replies: 81
Views: 2127

Re: RISC OS relicensed: now under Apache 2.0!

I am watching the thread but I shall remain an 8 bit’ter I think. But what I would say is that very few OS have made the transitioning to a ‘modern OS’ in the form they started. What I mean by this is. Linux is pretty much was written from the ground up from the 90s, windows/dos was pretty much rew...
by SarahWalker
Thu Nov 01, 2018 6:11 pm
Forum: software
Topic: RISC OS relicensed: now under Apache 2.0!
Replies: 81
Views: 2127

Re: RISC OS relicensed: now under Apache 2.0!

However it seems from your last post that this is one of many things you think ROOL should be enabling, and that by "retro" you just mean that RISC OS shouldn't be considered a commercial project to shepherd into the future, but rather something to preserve and enable people to tinker with. Retro i...
by SarahWalker
Mon Oct 22, 2018 5:06 pm
Forum: emulators
Topic: B-em PAL Emulation colour bug & fix
Replies: 1
Views: 191

Re: B-em PAL Emulation colour bug & fix

Just looked at the PAL code for the first time in years. Wow, is that code calling out for vectorisation! I may have a stab at it, if I get the time.
by SarahWalker
Wed Oct 17, 2018 4:58 pm
Forum: hardware
Topic: MEMC1A timeline and documentation
Replies: 7
Views: 390

Re: MEMC1A timeline and documentation

Oh, and the A540 uses a PAL to alter A22 and A7 for each MEMC. This is using nR/W, A7, A12-14 and A22-25. I'm guessing this is a) selecting MEMC responses to writes in 3600000-3ffffff (I believe 3600000-37fffff is written to all MEMCs, 3800000-3ffffff are selecting a MEMC based on what looks like A7...
by SarahWalker
Wed Oct 17, 2018 4:50 pm
Forum: hardware
Topic: MEMC1A timeline and documentation
Replies: 7
Views: 390

Re: MEMC1A timeline and documentation

The A540 schematics may be useful here - http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_A500R200TRM_Drawings.zip - showing how the quad MEMC system was wired up (interesting that the MEMC1a datasheet doesn't show this as a supported configuration, did an Acorn engineer just hack...
by SarahWalker
Wed Oct 17, 2018 4:35 pm
Forum: hardware
Topic: MEMC1A timeline and documentation
Replies: 7
Views: 390

Re: MEMC1A timeline and documentation

Improved performance (mostly due to implementing proper fixes for some bugs that MEMC used workarounds for?) The improved performance is entirely down to eliminating the need for workarounds. MEMC1a and MEMC1 w/o workarounds perform the same until you hit one of the bugs. It does feel a bit backwar...
by SarahWalker
Mon Oct 15, 2018 4:39 pm
Forum: for sale / freebies
Topic: Free Electron + Beeb bits
Replies: 10
Views: 665

Re: Free Electron + Beeb bits

I'm afraid everything's been allocated now!
by SarahWalker
Sun Oct 14, 2018 2:19 pm
Forum: hardware
Topic: FPA 10 diagnosis...
Replies: 4
Views: 238

Re: FPA 10 diagnosis...

Probably a stupid question, but are you using the FPA-supporting version of FPEmulator (4.xx)? The standard RISC OS 3.1 version won't work properly.
by SarahWalker
Thu Oct 11, 2018 9:14 pm
Forum: wanted
Topic: Repton: The Lost Realms
Replies: 13
Views: 467

Re: Repton: The Lost Realms

I think it was &E00.
by SarahWalker
Sat Oct 06, 2018 2:45 pm
Forum: for sale / freebies
Topic: Free Electron + Beeb bits
Replies: 10
Views: 665

Free Electron + Beeb bits

I'm having a bit of a sort at the moment, and I have a few things I'm willing to let go for the cost of postage (or alternatively I could bring to ABUG in November) : Electron. Seems to work okay, though the case could do with some restoring - it has obviously been held together with duct tape at so...
by SarahWalker
Thu Sep 27, 2018 5:29 pm
Forum: software: other
Topic: Native Beeb VGA output
Replies: 6
Views: 432

Re: Native Beeb VGA output

Ah, excellent! Should have known there was already a chip that did this.
by SarahWalker
Wed Sep 26, 2018 7:51 pm
Forum: software: other
Topic: Native Beeb VGA output
Replies: 6
Views: 432

Re: Native Beeb VGA output

You can have a 24kb frame buffer, as long as you don't need to use wraparound.
by SarahWalker
Wed Sep 26, 2018 5:14 pm
Forum: software: other
Topic: Native Beeb VGA output
Replies: 6
Views: 432

Native Beeb VGA output

Bit of a thought experiment - could you get an acceptable VGA signal out of a Beeb? I'm not referring to line doubling of the normal modes, but a native 480 line mode. A quick look at the standard VGA 480-line timings gives a horizontal line length of 31.778us with 25.422us of display, and horizonta...
by SarahWalker
Mon Sep 10, 2018 8:08 pm
Forum: software: other
Topic: New demo
Replies: 38
Views: 9439

Re: New demo

One.
by SarahWalker
Mon Sep 10, 2018 6:36 pm
Forum: software: other
Topic: New demo
Replies: 38
Views: 9439

Re: New demo

Thanks to keiranhj, I've finally (after nearly eight years!) got round to uploading a video of this captured from real hardware : https://www.youtube.com/watch?v=v8mzsLeBnNc. The preexisting video on Youtube was taken from Beebem, and showed at least 3 emulator bugs that I noticed.
by SarahWalker
Thu Sep 06, 2018 4:26 pm
Forum: hardware
Topic: Two-pin header on PC card
Replies: 3
Views: 240

Re: Two-pin header on PC card

That out of the way, here's my actual question. I also noted the RISC PC has a 486 PC card fitted, but there was a cable connected between a two-pin header on the PC card to two of the pins of the 10-pin audio header on the motherboard (I don't remember which two pins but I can probably guess it wa...
by SarahWalker
Fri Aug 24, 2018 5:30 pm
Forum: projects
Topic: New game - tube type thingy
Replies: 53
Views: 4161

Re: New game - tube type thingy

I won't post the code here right now - mainly because it's a mess :) - though I don't mind letting you have a look at ABUG. This seems to be what I did though : *RUN the parasite side loader, which then : - *LOADs the host side loader - Poke the run address of the host side loader into &20e via OSWO...
by SarahWalker
Wed Aug 08, 2018 4:32 pm
Forum: software: new games
Topic: New Release: Retro Software's WHITE LIGHT by Sarah Walker
Replies: 91
Views: 7182

Re: New Release: Retro Software's WHITE LIGHT by Sarah Walker

leenew wrote:
Wed Aug 08, 2018 12:29 pm
I have just played White Light on my Master from floppy disc.
All ROMS were *UNPLUGGED except for DFS 0.79 and BASIC.
Not familiar with this DFS version. What's the advantage of it, and why use it instead of the built-in DFS 2.24?
by SarahWalker
Mon Jul 09, 2018 4:22 pm
Forum: off-topic
Topic: Are kids still as excited by school computers as we once were?
Replies: 17
Views: 643

Re: Are kids still as excited by school computers as we once were?

I can't speak about now, but when I was at school (mid 90s to early 2000s), there was basically no excitement about school computers from the kids. Particularly if they were Acorns. No one cared, really.
by SarahWalker
Tue Jun 26, 2018 5:37 pm
Forum: projects
Topic: BeebSCUMM
Replies: 23
Views: 1189

Re: BeebSCUMM

This is based on the PC version, for a few reasons : The PC version uses the same engine for both Maniac Mansion and Zak McKracken. The C64 uses an older v0 engine for MM. The PC files are somewhat easier to get at - the C64 version looks to be using a non-standard disc format There are comments in ...
by SarahWalker
Sat Jun 23, 2018 9:59 am
Forum: projects
Topic: BeebSCUMM
Replies: 23
Views: 1189

Re: BeebSCUMM

It looks fantastic! I'm quite curious what implementing the scripting system entails. Is it the most complicated part of the code? I don't think the script interpreter is massively complicated (though the fact that it's multitasking will be fun...). It's more the fact that it's going to show up eve...
by SarahWalker
Fri Jun 22, 2018 9:33 pm
Forum: emulators
Topic: Econet for Arculator (and other emulators)
Replies: 13
Views: 829

Re: Econet for Arculator (and other emulators)

flibble wrote:
Fri Jun 22, 2018 8:20 pm
1) The API is windows only, the emulators are not.
FWIW, Arculator's podule code did get ported to Linux.
by SarahWalker
Fri Jun 22, 2018 6:24 pm
Forum: projects
Topic: BeebSCUMM
Replies: 23
Views: 1189

Re: BeebSCUMM

You could concentrate on what's actually being written, rather than talking about adding more work...

It's a little demoralising that the only posts so far are basically saying 'add more stuff!'.
by SarahWalker
Wed Jun 20, 2018 7:34 pm
Forum: projects
Topic: BeebSCUMM
Replies: 23
Views: 1189

Re: BeebSCUMM

leenew wrote:
Wed Jun 20, 2018 5:32 pm
Maybe John Blythe has 5 minutes spare to sprinkle some magic dust on the graphics :-k
Unfortunately, to avoid potential legal issues with the Disney corporation, I'm using the PC data unmodified. So no fancy new graphics I'm afraid.
by SarahWalker
Wed Jun 20, 2018 5:04 pm
Forum: projects
Topic: BeebSCUMM
Replies: 23
Views: 1189

BeebSCUMM

Meant to open a thread about this weeks ago... As some people noticed at the last ABUG, I've been working on a SCUMM interpreter for the Master (note - MASTER, not B+, B w/ SWRAM, or any variety of Electron!). This is a port of SCUMM v1, which is the original (non-enhanced) PC versions of Maniac Man...
by SarahWalker
Sun Jun 10, 2018 8:17 pm
Forum: projects
Topic: New game - tube type thingy
Replies: 53
Views: 4161

Re: New game - tube type thingy

I'm not entirely sure this is working as a game. I don't think limiting everything to a tube makes for particularly good handling. I really need to get some outside opinion on this though; the only person who's tested this other than me was Arcadian at the most recent ABUG, and the fact that he stru...
by SarahWalker
Thu Jun 07, 2018 5:02 pm
Forum: emulators
Topic: Which is the canonical Elkulator repository?
Replies: 5
Views: 389

Re: Which is the canonical Elkulator repository?

The 'canonical' one vanished when the Retro Software mercurial repo disappeared. If David's been working on the emulator then I'd suggest using his...
by SarahWalker
Sun Jun 03, 2018 7:06 pm
Forum: emulators
Topic: Econet for Arculator (and other emulators)
Replies: 13
Views: 829

Re: Econet for Arculator (and other emulators)

You mentioned it here : https://stardot.org.uk/forums/viewtopic.php?f=4&t=3864 . You can see quite how little interest there was. It's probably worth noting that despite RPCemu having had podule support for more than 10 years now, the only publicly released podules were the ones I threw together to ...