Search found 4679 matches

by MartinB
Mon May 21, 2018 11:52 pm
Forum: hardware
Topic: ECONET WOES
Replies: 45
Views: 2072

Re: ECONET WOES

In response to the RTC comments - I've ordered a RaMagic unit (from Martin) for those of you who remember these - I'm hoping it will work once I get the L3FS working. Apparently RAMagic faithfully implements OSWORD 14 Type 1 which returns 7 BCD time bytes as per the Master. I know nothing about Eco...
by MartinB
Fri May 18, 2018 6:11 pm
Forum: hardware
Topic: Cartridge slots
Replies: 8
Views: 333

Re: Cartridge slots

This probably causes issues if you try to add a new 6522 VIA chip, although MartinB's EUP cartridge does this, so it's definitely possible. I'm not sure if he just used the CPU clock or if he divided the cartridge port's 16MHz clock down to generate a 1MHz clock for the VIA. Yes, in order to ensure...
by MartinB
Thu May 17, 2018 9:21 pm
Forum: hardware
Topic: I2C 4 U
Replies: 123
Views: 9902

Re: I2C 4 U

Ha! Thanks Dave, but being an I2C nerd, I have of course already got sensors for all of those parameters (and much more besides) since one of the nice things about I2C is that it is a bus and you can just daisy-chain any gadgets at will so you can also freely pick and mix your sensors. Actually, tha...
by MartinB
Thu May 10, 2018 8:26 pm
Forum: general
Topic: how big can it be ?
Replies: 1
Views: 182

Re: how big can it be ?

I'm pretty sure it's 5Mb
by MartinB
Wed May 09, 2018 3:59 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 806
Views: 106902

Re: Wires? Pah.....

I'll have you know, I've got an ADFS floppy disc somewhere.

Now, let me see, where did I put it.......? :-k


ADFS Disc.jpg
by MartinB
Thu May 03, 2018 6:24 pm
Forum: hardware
Topic: My BEEB appears to be deaf..
Replies: 10
Views: 379

Re: My BEEB appears to be deaf..

I too suspect the serial ULA. This feels perhaps a little premature to me. You came to post based on an invalid configuration where the Beeb wasn't in tape mode and now it is, are you sure that your tape player is fit for purpose and outputting correctly on the ear socket (or DIN interface?) and th...
by MartinB
Thu May 03, 2018 5:24 pm
Forum: hardware
Topic: My BEEB appears to be deaf..
Replies: 10
Views: 379

Re: My BEEB appears to be deaf..

Are you sure it’s defaulting to being a tape machine? Try typing *TAPE <Return> before you use the tape load & save commands.
by MartinB
Wed May 02, 2018 10:08 pm
Forum: hardware
Topic: Model B Fault finding help please :)
Replies: 46
Views: 1525

Re: Model B Fault finding help please :)

Does a memory test program (mine or any other) still suggest an IC58 (viz Bit 5) fault?
by MartinB
Wed May 02, 2018 12:40 pm
Forum: hardware
Topic: Elk Sideways Rom\Ram, Shadow Ram etc.
Replies: 6
Views: 328

Re: Elk Sideways Rom\Ram, Shadow Ram etc.

For mine, the latest (V4) disc image is here.
by MartinB
Tue May 01, 2018 9:16 pm
Forum: software: other
Topic: Trying to get a rom into an SSD
Replies: 14
Views: 574

Re: Trying to get a rom into an SSD

No, no networking or Beeb-to-Beeb as it stands. It is very specifically a bespoke tool for seamlessly integrating DFS floppy discs into a web and PC-based world and as such, it does a fine job! :D. As a bonus, you can even run a great many games directly from a PC without the target Beeb having any ...
by MartinB
Tue May 01, 2018 8:32 pm
Forum: software: other
Topic: Trying to get a rom into an SSD
Replies: 14
Views: 574

Re: Trying to get a rom into an SSD

Not entirely sure what you still need tools and/or procedures for but if you build an UPURS cable, you can load sideways rom images into SWR directly from a PC (and export rom images to a PC) without any intermediate storage system being required. If you like real floppies, or indeed Gotek floppy ‘l...
by MartinB
Wed Apr 25, 2018 10:34 pm
Forum: other vintage computer hardware, software and games
Topic: Grandstand 6000 - ADMAN 1978
Replies: 6
Views: 271

Re: Grandstand 6000 - ADMAN 1978

No Col, deffo don’t plug it into a Beeb rom socket, it isn’t a memory device, it’s a bespoke game-on-a-chip and you’d probably bust it!

1375A222-DCC4-4A89-B3BE-684A8C59E835.png
by MartinB
Thu Apr 12, 2018 9:32 am
Forum: hardware
Topic: Unknown Sideways RAM / ROM adapter
Replies: 7
Views: 489

Re: Unknown Sideways RAM / ROM adapter

....then MartinB has developed some utilities, which should work for you. Yes, EELOAD works fine with SWR and there are both disc and rom-based version of the utilities. (By the way Ken, I haven't forgotten about the anomalies you kindly reported and I will soon be getting around to releasing an ud...
by MartinB
Tue Apr 10, 2018 5:38 pm
Forum: programming
Topic: Keyboard Buffer
Replies: 6
Views: 345

Re: Keyboard Buffer

:roll:

JGH wrote:No, the keyboard buffer is in MOS workspace, not in language workspace, and it is at &03E0-&03FF

Read my reply - I said exactly that.

and wrote:&700 is BASIC's command input buffer

I said that too and I was being helpful with extra information.
by MartinB
Tue Apr 10, 2018 10:13 am
Forum: programming
Topic: Keyboard Buffer
Replies: 6
Views: 345

Re: Keyboard Buffer

I often needs to pull things out of the command line for my utility programs and the the characters are always in readable ASCII - the buffer is in the $700 region for BASIC (&3E00-&3FF for OS) but there's OS calls to dynamically find the start address and to pull characters (I think!).
by MartinB
Sat Apr 07, 2018 8:22 am
Forum: hardware
Topic: Testing Beeb's analogue port
Replies: 17
Views: 653

Re: Testing Beeb's analogue port

Apart from scrambling the data bus, which is highly unlikely I feel, the only way the ADC could potentially 'hang' the Beeb would be by it's generating permanent or continuous End of Conversion (EOC) interrupts (or strictly Events to the OS) which might possibly drag the OS into a tight servicing lo...
by MartinB
Fri Apr 06, 2018 7:50 pm
Forum: hardware
Topic: Testing Beeb's analogue port
Replies: 17
Views: 653

Re: Testing Beeb's analogue port

As often as not, problems with the analogue port are due to cracked joints at the motherboard_to_15-way connector interface due to repeated waggling when plugging and unplugging joysticks. It generally doesn’t lead to ‘crashing’, just joystick-related intermittency and weirdness, but IMHO resolderin...
by MartinB
Fri Apr 06, 2018 6:05 pm
Forum: hardware
Topic: Testing Beeb's analogue port
Replies: 17
Views: 653

Re: Testing Beeb's analogue port

For a quick test, I just use this.... 10 PRINT~ADVAL(0)AND3;" ";~ADVAL(1);" ";~ADVAL(2);" ";~ADVAL(3);" ";~ADVAL(4) 20 GOTO10 When run, the fire buttons are reflected in the first column as 0,1, 2 or 3 depending on the combination of the two being pressed and ...
by MartinB
Tue Apr 03, 2018 10:28 pm
Forum: hardware
Topic: BBC Model B - memory or video fault?
Replies: 6
Views: 330

Re: BBC Model B - memory or video fault?

Run the test program here in all the screen modes (with repeats as necessary) and see if you get either a memory IC fault reported or if you observe any unusual video artefacts on the display.
by MartinB
Mon Apr 02, 2018 9:09 pm
Forum: hardware
Topic: Hard disks just spin
Replies: 1
Views: 170

Re: Hard disks just spin

It’s a long shot but is there a chance you could have reversed the connector when plugging the drives into the original Beeb, or even have the connector offset by a pin row? I only ask because a constantly spinning drive is usually a reversed connector.....
by MartinB
Thu Mar 29, 2018 7:08 pm
Forum: hardware
Topic: Pegasus, New AP5 and New AP3/4 Painted Metal case
Replies: 28
Views: 2273

Re: Pegasus, New AP5 and New AP3/4 Painted Metal case

Daniel wrote:...and an epic


Thanks Daniel, I'll take the complement... :D
by MartinB
Thu Mar 29, 2018 12:20 pm
Forum: wanted
Topic: B+128 keystrip & upper case
Replies: 30
Views: 1065

Re: B+128 keystrip & upper case

Nice job, these will be very useful.... =D> :D
by MartinB
Tue Mar 27, 2018 8:35 pm
Forum: for sale / freebies
Topic: P.M.F. Barcode Reader
Replies: 20
Views: 1313

Re: P.M.F. Barcode Reader

I'll endeavour to dig it out and make an image. If I can find it reasonably quickly tonight then I'll post it later... Here you go, courtesy of 10 seconds with UPURS..... :D " Barcode Support ROM Version 0.1 (C) Mike Ginns 1987 " barcode.zip Note that I dumped it as a 16k rom (the physica...
by MartinB
Tue Mar 27, 2018 11:44 am
Forum: for sale / freebies
Topic: P.M.F. Barcode Reader
Replies: 20
Views: 1313

Re: P.M.F. Barcode Reader

A ROM version is also mentioned in the original post on this thread. I did have a play with this after Kieran sent it to me and although I can't rememeber how I drove it software-wise (I've slept since... :roll:), I think I must have the used the rom so I'll endeavour to dig it out and make an imag...
by MartinB
Sun Mar 25, 2018 6:02 pm
Forum: hardware
Topic: Questions about BBC B memory fault
Replies: 18
Views: 610

Re: Questions about BBC B memory fault

I've run pretty much every test I can think of on the machine, and I'm still seeing the occasional speckle on a mode 0 screen. It often happens when you type. In fact, the same location on the screen changes a bit the more you type. You don't have any misbehaving roms in there do you? I only ask be...
by MartinB
Sun Mar 25, 2018 12:12 pm
Forum: software: other
Topic: Forbidden characters in filenames
Replies: 6
Views: 396

Re: Forbidden characters in filenames

The Advanced Disc User Guide says....

35108E4E-0601-4C80-B280-2E29543FA7C7.png


That’s DFS but I imagine it didn’t change for ADFS.
by MartinB
Sun Mar 25, 2018 9:38 am
Forum: hardware
Topic: MartinB's Memory Test Tool
Replies: 12
Views: 644

Re: MartinB's Memory Test Tool

8)
by MartinB
Sun Mar 25, 2018 8:23 am
Forum: hardware
Topic: MartinB's Memory Test Tool
Replies: 12
Views: 644

Re: MartinB's Memory Test Tool

Hi again Ken - I really feel that this is heading to a pointless place. Yes, some chips have internal pull-ups (and I knew about the 139) but you don't design around these things. The general safe rule is don't leave externally floating inputs in logic circuits. However, all of this irrelevant here....
by MartinB
Sun Mar 25, 2018 7:35 am
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2880

Re: HostFS and microcontrollers?

Martin, this looks like the race condition I pointed out to you way back when (2013, according to my email history... wow that was a long time ago!). Hi Stephen - yes it is and I did acknowledge that to Dave a few posts further up.... Yes, now you mention it, I think Stephen did tell me about that....
by MartinB
Sun Mar 25, 2018 7:23 am
Forum: hardware
Topic: MartinB's Memory Test Tool
Replies: 12
Views: 644

Re: MartinB's Memory Test Tool

I had a suspicion that you (or someone) might suggest that and I did consider it but ultimately decided no, it isn't a valid option. If you look at the snip below, you'll see that without S25 fitted, the input to the 139 is floating and this could actually give variable results. So, its not within t...