stardot.org.uk

I use a Willem EPROM EEPROM etc. programmer.
They handle a very wide range of chips.
They're about £25 to £30.
Ray

That does not look right, the rom images have not loaded into the SWRAM slots. The *SRLOAD commands should load the 4 rom images into 4-7 so they should appear when you do *ROMS. Make a copy of the boot file, e.g. load into EDIT and save under a new name; then try editing the boot file in to *SRLOAD...

After the first CTRL+BREAK try *ROMS to check that the roms have loaded OK.
I presume that the W-Z map to 4-7 somehow and your system has 4-7 available as SWRAM.
Ray

Problem solved.
For Electron/BBC with RGB to SCART cable the OSSC needs LineMult MODE set to 4.
However for my A310 with a 9 to 15 pin VGA adapter it needs LineMult MODE set to 2.
Ray

I have read the threads showing an Electron, etc. connected to an OSSC working OK so have invested in one. However my Electron is not giving a picture. By default with an RGB to SCART cable connected it shows the image with the borders and the firmware version on the OSSC screen. I assume the OSSC s...

Very nice (apart from the Econet port being re-used for IDE drives when there is a perfectly good 1 MHz bus already for this purpose) but the Master does already come with 4 sideways RAM banks as standard... The seller stated that he used the Econet port in order to free up the bus and user ports f...

JasonStonier wrote: ↑

Wed Sep 30, 2020 11:28 am

So
£12 Parts
£1.20 board
£0.50 consumables
£0.88 postage

Rounding up looks like £15.
I would have one at that price.
Ray

One please. UK address.
Ray

JasonStonier wrote: ↑

Fri Sep 25, 2020 11:05 am

Yes, it is polarised. C9 is an electrolytic capacitor - the negative is indicated by a lighter stripe on the body pointing to the -ve lead.

And, yes, it really matters which way round it goes! The negative lead should face towards the two big electrolytics C6 and C8.

Thanks Jason,
Ray

I have opened the psu. C1 & C2 have already been replaced.
I have removed C9. The replacement has one leg longer than the other, long=positive says google.
Does it matter which way round it goes?
I can see no +/- indication on the board.
Ray

Using the ROM archive: Such a large collection can only be housed on a DataCentre USB stick or an ADFS hard drive (IDE CF card or BeebSCSI). BBCroms.zip http://rayharper.co.uk/stardot/Stardot.html can be extracted to a directory with any name on the USB stick. UNIMNU7.SSD should be in the same direc...

Preamble: When I retired about 15y ago I bought a Master 128 that came with a large (about 1000) ROM collection in two main directories - arranged by type and publisher with some duplication. I have not used it because it was too difficult to find what I wanted. Recently I have written software to c...

Thanks for all of the advice.
I have a spare Meanwell PT65A. I have used these in several BBC's previously.
I can put that in my backup Master while I investigate the Master's psu and replace C9 for a start.
Thanks,
Ray

Do you have any test equipment? Could you stick a meter on the 5V supply and watch to see if it is slowly rising over those few seconds? Tested and there is no power. I have swapped the psu with one from my backup Master and my main machine is now OK. Any suggestions for which component in the psu ...

My Master 128 has become slow to startup from cold - about 15 sec. It has become steadily worse over the last few weeks - longer to start. Once warm - switch off, wait a few seconds, switch on - starts immediately as normal. Wait 10 minutes - takes about 10 sec. Is this symptomatic of a component in...

Yes, my Beeb image stopped working under Windows 7 several months ago.
Ray

Similarly I'd have two when available.
Ray

You can use a standard floppy drive cable. There is usually just enough space for the connector.
Choosing the appropriate set of pin-holes may be hit & miss.
Ray

UNIMENU & UNIMNU4 could be used with a DataCentre to load disc images and carry out actions (CHAIN, RUN, etc.) on files. However as with the version for BBC Sth games run from the DataCentre all of the images would have to be in one Directory and that had to be set as the current directory before ru...

There is a timing issue with 8271 DFS and 3.5" drives. DFS 1.21 may work better. If the format completes, then it means the disc has been formatted but the ? indicates retries. Possibly on the first attempt at formatting a track after stepping, the controller hasn't caught up with the drive and mis...

I have a model B where ADT *FORM 80 0 or *FORM 80 2 gives a pattern of errors: 04? 0D? 16? 1F? 28? 31? 3A? 43? 4C? So error at track 5 and every 9th thereafter. I am using a known good cable, 3.5" drive and discs, DNFS (with DFS1.2). I have cleaned the connector with a brush and IPA. I wonder whethe...

I have PiTubeDirect running on a Raspberry Pi v1 +HAT connected to a Tube cartridge, an AP5 would do just as well.
I have described using this with Z80/CPM and BBCBASIC viewtopic.php?f=3&t=19899.
Ray

I have PiTubeDirect running on a Raspberry Pi v1 + HAT connected to a Tube cartridge, no reason not to expect it to work with an AP5 or Pi zero. I run the system (A) with a MMC card cartridge + MMFS (Ramtop ELKSD64) or (B) with a Plus 3, ACPDFS2 & Gotek second drive. A. I have put the SSD files avai...

You can get the edge connectors from Dave Hitchins.
To copy from GoTek to Plus 3 you can BACKUP or COPY the syntax varies depending on whether you are using ADFS or DFS or have a utility ROM such as ADT which has a BACKUP command. For ADFS you may need the Welcome disk for BACKUP.
Ray

I'd be interested in a board.
Ray

videofx wrote: ↑

Thu Jun 25, 2020 8:45 pm

Basically everything you need to know to get ROMS to load in your Master
Cheers!

SWRAM is slots 4-7 but these can be configured for ROMs.
To load a ROM image from the active disc filing system to slot n:
*SRLOAD ROMNAME 8000 n
Ray

Just to expand on the discs in the Plus 3. I have used a copy of a bootable BBCBASIC.dsd disc, deleted all files except BBCBASIC, copied STAT.COM, PIP.COM, DIP.COM + 4 of my own BASIC files onto the disc. I would expect these to extend to more than a sector and so fail at some point if the disc was ...

I am just entering the world of cpm. I think I understand that the normal cpm file format is 400k interleaved - discname.dsd However, there are also 400k non-interleaved, sequential versions of the systems discs - discname.ssd I am not sure what these are for except perhaps the following: MMC cards ...

I have a SCART to VGA, a GBS8200 and John's BBC2DVI.
I prefer the BBC2DVI partly because it requires no power (how is that possible!).
I thought it was expensive but other than the SCART to VGA adapter it is actually competitive.
Ray

If your beeb has an 8271 disc interface and you don't plan to upgrade then MMC is the choice unless you plan to use a second processor. The GoTek reality check: You need to download the transfer software and get the 'special' usb cable. The software is not completely straightforward to use. Put flas...