Search found 4572 matches

by MartinB
Sat Jan 13, 2018 5:33 pm
Forum: hardware
Topic: Floppy drive ready line.....
Replies: 2
Views: 116

Re: Floppy drive ready line.....

I've always understood FDD READY to simply mean that correct power is present, a disc is inserted and that the spindle is up to speed - typically with a threshold of around 90% of full speed. Thus, I wouldn't expect stepping to affect it. Some drives do have jumpers to configure the conditions for R...
by MartinB
Fri Jan 12, 2018 4:41 pm
Forum: hardware
Topic: Recurrent corrupted discs - possible floppy drive fault?
Replies: 17
Views: 356

Re: Recurrent corrupted discs - possible floppy drive fault?

One of the advantages of using UPURS for DFS disc writing (doesn't do ADFS [-X ) is that all the writing is done on the Beeb (or Elk or Master) and you therefore never get strange incompatibility issues with drives and discs.
by MartinB
Wed Jan 10, 2018 11:28 pm
Forum: hardware
Topic: Plus1 Cart slot enables?
Replies: 4
Views: 169

Re: Plus1 Cart slot enables?

On my Fisher Price EUP, the on-board rom/ram slot is configured to accept a 16k or a 32k chip and in the case of the latter, ROMQA is simply connected directly to A14 of the device to give two 16k roms.
by MartinB
Sat Jan 06, 2018 7:03 pm
Forum: hardware
Topic: Floppy switch configs
Replies: 41
Views: 692

Re: Floppy switch configs

Maybe there’s nothing wrong with that line and it’s just doing what it’s supposed to in trapping errors except that ERL is, for some reason, being set to 40 or 320 even though there’s an error elsewhere? Daniel - I can’t access anything Beeb just now, if you type the line into Beebem as line 10 and ...
by MartinB
Thu Jan 04, 2018 10:42 pm
Forum: bbcmicro.co.uk
Topic: Help required for the new BBC games archive
Replies: 324
Views: 21490

Re: Help required for the new BBC games archive

Heh - it was just one of a few ditties that I submitted to TMU and one that they liked enough to publish so “ Survive! ”, a simple but fun Mode 7 Tron-type game written in hybrid BASIC and assembler. Nothing compared to your efforts though Paul (plus Lee et al) and you certainly made my day - if one...
by MartinB
Wed Jan 03, 2018 9:15 pm
Forum: bbcmicro.co.uk
Topic: Help required for the new BBC games archive
Replies: 324
Views: 21490

Re: Help required for the new BBC games archive

Ha! I'm not much of a gamer myself but have kept an admiring watching brief on this project and of course, the grandkids love it! 8) Anyway, just on a random whim, this evening I typed my name into the search box and lo!, my one claim to fame (albeit a mere shadow of the bulk on offer) appeared! Yay...
by MartinB
Fri Dec 29, 2017 10:05 pm
Forum: hardware
Topic: Random pixels on BBC Model B
Replies: 60
Views: 1120

Re: Random pixels on BBC Model B

It would still be worth trying my ditty in all the modes - due to its being predicated on display symmetry, it’s often a quick way to at least first determine whether the the fault is random or consistent in nature. Jus’ sayin’...... 8)
by MartinB
Fri Dec 29, 2017 5:33 pm
Forum: hardware
Topic: Random pixels on BBC Model B
Replies: 60
Views: 1120

Re: Random pixels on BBC Model B

My program won’t point you at a given ram chip - for that, use this short program... 5 MODE 0 10 ?&4000=0 20 A=?&4000 30 IF A=0 THEN GOTO 20 40 PRINT ~A ...which is a very slightly modified version of a test originally suggested by Mark H. If you get a hex number output then any bits ‘set’ i...
by MartinB
Fri Dec 29, 2017 4:45 pm
Forum: hardware
Topic: Random pixels on BBC Model B
Replies: 60
Views: 1120

Re: Random pixels on BBC Model B

From many years ago, here’s a copy of a post of mine related to faults with screen corruptions which might add some value to your investigations. If a given mode ‘passes’ but you see visual corruption then that points at the display circuitry whereas if a given mode test reports a fail, then that su...
by MartinB
Sun Dec 17, 2017 6:58 pm
Forum: hardware
Topic: Cumana Dual 5 1/4 floppy drive
Replies: 27
Views: 486

Re: Cumana Dual 5 1/4 floppy drive

Could you find and post the drive mechanism model number on a label on the back of the drives? They're probably FD-1057 or similar but knowing might help us to validate the jumper settings.
by MartinB
Mon Dec 11, 2017 10:20 pm
Forum: stardot.org.uk
Topic: Image rotation
Replies: 17
Views: 615

Re: Image rotation

Paul - on my IOS 11 iPad Air, when I look at your ‘snow’ picture as it appears in the thread, it is indeed upside down. However, if I tap (viz ‘click’) on it to see the full-size image, it is then the right way up! This is true for Safari, Chrome or Puffin. That doesn’t sound as simple as having one...
by MartinB
Wed Dec 06, 2017 3:12 pm
Forum: archive submissions
Topic: INPUT Magazine Game Listings
Replies: 23
Views: 431

Re: INPUT Magazine Game Listings

Yacht is more popularly known as Yahtzee :wink:
by MartinB
Sun Dec 03, 2017 1:06 pm
Forum: hardware
Topic: high density disks
Replies: 162
Views: 22867

Re: high density disks

Good work! =D> I have a manual switch on my 5.25” drive whilst the 3.5” auto-switches depending on whether I insert a HD or DD disc and I can therefore have any combination of DD/HD media in the two drives. I’ve basically just forgotten it’s there tbh and the only time I need to care is if I’m sendi...
by MartinB
Fri Dec 01, 2017 9:12 pm
Forum: hardware
Topic: EPROM Programmer collectors roll call
Replies: 47
Views: 5666

Re: EPROM Programmer collectors roll call

how do we store files on the web? used to know about rapidshare ? now ? ? ? Dropbox is pretty good, you just want the Basic account which is free and gives you 2GB of storage. You can have private and public areas for which you can post sharing links in the usual way and there’s also an app for pho...
by MartinB
Wed Nov 29, 2017 11:57 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

Yes, I originally looked at the 29C256 and although it is slightly more pin-assignment compatible in relation to ‘ normal ’ Beeb-familiar memory devices, in the end I favoured the 28C256 because (I think) at least at that time four years ago, it was harder to source non-dubious examples of the forme...
by MartinB
Sat Nov 25, 2017 7:40 pm
Forum: wanted
Topic: Would like to borrow: Hydra controller card
Replies: 15
Views: 667

Re: Would like to borrow: Hydra controller card

The red star denotes threads in which you’ve posted - i.e. I’ll see one for this thread too now.... :wink:
by MartinB
Fri Nov 24, 2017 12:07 pm
Forum: off-topic
Topic: Which Steam Iron?
Replies: 3
Views: 161

Re: Which Steam Iron?

Daniel wrote: Any recommendations?

Let your wife to do the ironing in future...
by MartinB
Tue Nov 21, 2017 10:51 pm
Forum: hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 48
Views: 3538

Re: loading UEF images into the Elk with UPCFS on EUP

Star commands should work for Jungle Journey and Castle Raider. For other ROMs used with the MGC, you just copy them into SRAM or page them in and do a CALL !-4 instruction from BASIC. It should at least be possible to experiment with 16K games for those without separate SRAM. :) Ok, thanks David, ...
by MartinB
Tue Nov 21, 2017 9:31 pm
Forum: hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 48
Views: 3538

Re: loading UEF images into the Elk with UPCFS on EUP

That’s a good point David, I think I must have missed your previous post where you already alluded to this. I did, as you say, use your Jungle Journey game roms when testing e-squared on the Elk and very good it was too! A great game and perfect for the integration testing... =D> 8) Yes, EUP does in...
by MartinB
Sat Nov 18, 2017 8:57 pm
Forum: hardware
Topic: Mods and ROMS
Replies: 13
Views: 588

Re: Mods and ROMS

(sorry rune , slightly off-topic, but not if you wisely put UPURS in one of your many rom slots :- ) @ myelin - Loving the blog Phillip =D> but just one small point of order if I may.... On your ‘ Starting out ’ page.... 0CC7D5ED-E0D5-4DA3-A295-6512AFBB6F87.jpeg ....on the Beeb and Master, all the U...
by MartinB
Fri Nov 17, 2017 9:04 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

Thanks for the heads-up Ken, I was confused there for a moment because I’d forgotten that I sent you the sources! Clearly, I was not fully in the room when I tested the EEP utils :roll:. Anyway, I’ll sort out some fixes and then think about the hard part which is producing the releasable bundles for...
by MartinB
Fri Nov 17, 2017 9:01 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

:shock: Does that include any of my utils Dave? If so, any details to share...?

@Ken - thanks for the clarification, I'll get on and sort it as soon as I've got a handle on the 32k SUM issue too... 8)
by MartinB
Fri Nov 17, 2017 12:09 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

Ok Ken, had a quick look and I can straight away see that the corruption problem is basically because I do a device-type test for LOCK and UNLOCK to check that the user isn't wasting their time with an unsuitable device or configuration thereof but what I don't do is restore the $FF EOR'd first byte...
by MartinB
Thu Nov 16, 2017 11:18 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

I haven’t got the source with me at the mo (just a matter of a netbook rather than an iPad) but yes, I do perform a write test although I didn’t realise I was leaving a ‘corruption’ in place unless I got sidetracked by the need for a physical write-protect switch and never properly reviewed that pro...
by MartinB
Thu Nov 16, 2017 10:33 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

....pin 22 (nOE) is wired to IC73 pin 25 (nRDS) and pin 27 (nWE) is wired to IC73 pin 24 (nWDS) Hmmm..... If you read any of the installation instructions in the thread, you’ll see that I specified RnW and WnR and that in response to another user having issues with nRDS and nWDS, I tried using the ...
by MartinB
Thu Nov 16, 2017 8:24 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

Yes, that is indeed correct and this effect and the consequent need for a hardware write protect switch is actually all fully documented in the thread. So dv8 is correct and you (Ken) will almost certainly find that everything behaves as it should if you always apply hardware write-protect after pro...
by MartinB
Thu Nov 16, 2017 12:28 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

Short answer is no. I wasn't aware of that switch. I'll try that this evening and report back. Its generally not as critical on a Beeb, it tends to depend on what's already in the eeprom prior to any change. If the eeprom is already empty or full of garbage then the OFF command likely won't make an...
by MartinB
Thu Nov 16, 2017 7:28 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

@Mekon - You mentioned a write-protect switch but how have you otherwise configured the eeprom in the cartridge? I published details of how to modify a Master or Elk cartridge to take a single AT28C256 device configured as a 32k 2-rom unit and in that instance, you need to use the EEP32 configurati...
by MartinB
Mon Nov 13, 2017 11:30 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 346
Views: 29151

Re: EEPROM - the Holy Grail of Sideways Rom?

As a sanity check (and although this one’s maybe a pain :roll:), could you first revert to a ‘normal’ Beeb again without the IntegraB and configure one of your 28C256’s in the originally prescribed manner? That would at least vindicate the eeprom chips (or otherwise) without you having to try a diff...
by MartinB
Fri Nov 10, 2017 9:53 am
Forum: community projects
Topic: Remastered BBC B and B+ User Guides
Replies: 7
Views: 266

Re: Remastered BBC B and B+ User Guides

Nice one Paul, these are excellent.... =D> 8)

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