Search found 548 matches: "master ram board"

Searched query: master ram board

by 1024MAK
Sun Jan 20, 2019 11:41 pm
Forum: hardware
Topic: A bit of fun: Which version of BBC Micro is the best?
Replies: 29
Views: 589

Re: A bit of fun: Which version of BBC Micro is the best?

... Program on using BASIC - BBC B / BBC B+ / BBC Master 128 / BBC Compact / Electron with disk expansion ... wait for a while) OR BBC B (issue 4 or issue 7 board) AND BBC Master 128 (or if you are lucky, ... well worthwhile getting some kind of sideways RAM for it. There are a number of options available. ...
by KenLowe
Tue Jan 15, 2019 12:26 pm
Forum: hardware
Topic: New ROM / RAM Expansion Board for BBC B
Replies: 26
Views: 553

Re: New ROM / RAM Expansion Board for BBC B

Hi Ken - this sounds like an amazing expansion board, great work! One question I have - how does the SHADOW RAM work; Is it possible to do 'Master style' double-buffering, i.e. have the CPU write to one ...
by kieranhj
Tue Jan 15, 2019 11:57 am
Forum: hardware
Topic: New ROM / RAM Expansion Board for BBC B
Replies: 26
Views: 553

Re: New ROM / RAM Expansion Board for BBC B

Hi Ken - this sounds like an amazing expansion board, great work!

One question I have - how does the SHADOW RAM work; Is it possible to do 'Master style' double-buffering, i.e. have the CPU write to one memory bank whilst the CRTC 6845 video chip reads from the other?
by jms2
Tue Jan 15, 2019 8:10 am
Forum: hardware
Topic: New ROM / RAM Expansion Board for BBC B
Replies: 26
Views: 553

Re: New ROM / RAM Expansion Board for BBC B

Wow, that's quite an achievement Ken - well done!

I already have a B with a (not quite as good) shadow ram and rom board, and a Master, so I'm not interested in buying a pcb. But I'm certainly interested to hear about the details of your project and I'm sure others will be as well.
by hoglet
Sun Jan 13, 2019 6:58 pm
Forum: hardware
Topic: BBC Master grumpy sideways RAM detection
Replies: 39
Views: 495

Re: BBC Master grumpy sideways RAM detection

Daniel,

Do you have one of the cheap 16-bit logic analyzers? e.g. one of these:
https://hobbycomponents.com/cypress/242 ... ment-board

If so, you could try to capture a trace from the 65C12 and feed it through the 6502 Decoder.

Dave
by myelin
Mon Jan 07, 2019 8:29 pm
Forum: hardware
Topic: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?
Replies: 69
Views: 2001

Re: A3000 in-system programmable ROM -- any interest?

... IOC and then perform a handshake with the keyboard, then performing a keyboard scan is quite ... master/a3000_rom_emulator/os_switcher_bootloader ... is when the OS is changed to fill the CMOS RAM with suitable defaults. Would it be possible ...
by 1024MAK
Thu Dec 27, 2018 6:55 pm
Forum: hardware
Topic: Issue 4 display fault
Replies: 5
Views: 316

Re: Issue 4 display fault

... works fine using modes 0 to 6 then it’s not a RAM memory fault. You talk about mode 135, but shadow screen modes are only available on BBC B+ and Master machines (unless you have a third party expansion board fitted). It looks like you have lost part of the data ...
by Pablos544
Sun Dec 23, 2018 11:25 am
Forum: off-topic
Topic: I sold my BBC Micro now looking at BBC Master
Replies: 20
Views: 592

Re: I sold my BBC Micro now looking at BBC Master

... it's gonna have a ready made market of BBC Master owners out there of which I know there are ... have made me keep the BBC Micro was a SHADOW RAM card like Steve Picton's 128k ROM/RAM Eiffel Board but with SHADOW RAM as well. I think he used to do ...
by Kazzie
Wed Dec 12, 2018 10:06 am
Forum: hardware
Topic: Model, specification, and upgrades identification
Replies: 7
Views: 298

Re: Model, specification, and upgrades identification

... is very instructive: it will tell you how much RAM is fitted, and any disc controller interfaces ... German one reports "Acorn OS 32K" IIRC. The Master series show "Acorn MOS" instead, but the ... different (cartridge slots above the keyboard). I'll be concentrating mainly on the A/B/B+ ...
by Dan1975
Sat Dec 08, 2018 1:26 pm
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 49
Views: 1402

Re: Vintage Collections

... BBC B with gotek Acorn Electron with Slogger Master RAM board Atari 520STFM SNES PS2 Sensible Software edition Mini Megadrive ...
by danielj
Sun Nov 25, 2018 8:59 pm
Forum: hardware
Topic: Elk ADFS niggles, questions and thoughts.
Replies: 19
Views: 509

Re: Elk ADFS niggles, questions and thoughts.

... the PRES E00 ADFS, which runs from sideways RAM. That leaves all your memory there, *but* it ... work, especially combined with a master ram board (so you don't find yourself running out of RAM), but ...
by 1024MAK
Wed Nov 21, 2018 10:15 pm
Forum: hardware
Topic: Name that ROM? (plus a dumb question about EEPROM programming)
Replies: 7
Views: 386

Re: Name that ROM? (plus a dumb question about EEPROM programming)

The Master will ignore any ROM in the 32k byte capable sockets if the relevant links are set to use the on board RAM as sideways RAM...

IC41, IC37
Link 18, 19
Link fitted west enables RAM
Link fitted east enables ROM socket.

Mark
by Dan1975
Tue Nov 20, 2018 8:24 am
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 49
Views: 1402

Re: Vintage Collections

Slowly rebuilding my collection after stupidly selling my previous lot (which included a Falcon!!) :oops:

Currently have:-

BBC B with gotek
Acorn Electron with Slogger Master RAM board
Atari 520STFM
SNES
PS2
Sensible Software edition Mini Megadrive

Still got a long way to go lol
by trixster
Sun Nov 18, 2018 11:11 am
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 49
Views: 1402

Re: Vintage Collections

... my list of machines: 2x Atom (RAMROM, Colour board, Tube, AtoMMC) BBC B (VideoNula, Pi0, Ram/Rom, WE Ram card) Master (DataCentre, ReCo6502, BeebSID, FreeFi) C64 (Sav64, LumaFix) ...
by IanB
Mon Oct 29, 2018 8:05 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 606
Views: 23305

Re: RGB to HDMI using a Pi Zero and a small CPLD

... at it soon. I've been testing my other two Master boards and neither of them have the glitches in the sync ... Master 128s in the field. I suspect there might be a RAM fault on my original board so I'm switching to the other ...
by IanB
Tue Oct 23, 2018 7:27 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 606
Views: 23305

Re: RGB to HDMI using a Pi Zero and a small CPLD

... I should try to get Quest Paint running on my Master so I can see what's going on here. This was ... so it isn't easy to get it running in sideways RAM and even I never ran it from sideways RAM as ... a RAM based development version of the PALROM board before I started so it was designed from ...
by guddler
Wed Oct 10, 2018 11:16 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 38085

Re: EEPROM - the Holy Grail of Sideways Rom?

... would have been useful to make it clear which board I was using of course :) This one: https://www.beebmaster.co.uk/8bitadd/AcornCartridge.html ... tools are using pin 10 of the cart to detect Master vs. Electron then that may have been introducing ... Dual MOS - usually set to 3.5 RetroClinic RAM ...
by cmorley
Mon Oct 08, 2018 8:13 pm
Forum: hardware
Topic: Sideways ROM/RAM question
Replies: 5
Views: 214

Re: Sideways ROM/RAM question

Does that mean that add-in boards implement the address decoding fully - for example, the Boobip RAM appears at slots 2 and 6, with no ghosting? Yes. On my ... a 32KB ROM with 2 images in (like you can in a B+ or Master). Any ROM board will need to implement decoding or ...
by RobC
Mon Oct 08, 2018 9:19 am
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

Re: How to Health Check My BBC Master (128/512)

I think the reason it's not reverting to RAM with the AA board removed is that the connectors from the AA board replaced ... post . On the keys, it's not uncommon to see this on a Master. I often find that repeatedly pressing bad keys with ...
by SteveLovell
Mon Oct 08, 2018 9:09 am
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

Re: How to Health Check My BBC Master (128/512)

... config, I was surprised that with the AA Board disconnected, it didn't automatically revert to ram in slot 6. And when it's disconnected the *HI command ... to do some other odds and ends today, but for the Master it looks like it's mostly just needing the CMOS ...
by RobC
Mon Oct 08, 2018 8:20 am
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

Re: How to Health Check My BBC Master (128/512)

was then able to use the boards *HI command to set slot 6 to ram. And then Elite seems to load successfully. Glad that you ... to sell, it might be worth selling it separately to the Master.
by SteveLovell
Sun Oct 07, 2018 8:52 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

Re: How to Health Check My BBC Master (128/512)

... quick Google revealed it is indeed a Morley AA Master ROM Expansion board . With that identified, I found the instructions and ... able to use the boards *HI command to set slot 6 to ram. And then Elite seems to load successfully. I'll have ...
by RobC
Sun Oct 07, 2018 4:39 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

Re: How to Health Check My BBC Master (128/512)

That extra board looks like a Morley AA ROM board. It allows you to switch between ROMs on the board and sideways RAM under software control. I can't remember the commands at the moment but think the manual is on the web. ...
by SteveLovell
Sun Oct 07, 2018 1:29 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 806

How to Health Check My BBC Master (128/512)

... I recently inherited my father's old BBC Master. It was originally a 128, but was upgraded ... Power-On+R I've little idea how to use the on-board utilities, so I'm mostly testing using game ... just hang. Elite complains that I have missing ram in slot #6. Some discs seem to be corrupted. ...
by RobC
Mon Oct 01, 2018 8:36 pm
Forum: software: other
Topic: Mastering the B
Replies: 3
Views: 320

Re: Mastering the B

... anything that can be done to make the B more Master compatible? There is the Integra-B board that adds some (most?) of the Master's functionality to the Beeb. However, I don't think it adds shadow RAM in quite the same way (I have an Integra-B board but ...
by jms2
Sun Sep 30, 2018 9:51 pm
Forum: hardware
Topic: Return to E2P - the Electron Second Processor
Replies: 9
Views: 546

Return to E2P - the Electron Second Processor

... Systems (better known for their Elk Mode 7 board). Although functionally compatible with Acorn ... an ingenious memory window concept using some ram which appears in a sideways rom socket at addresses ... disc. In the intervening years I installed a Master RAM board and Prime's Plus 3 Ram/Rom ...
by Prime
Sun Aug 26, 2018 7:04 pm
Forum: acorn atom and system
Topic: Atom software archive menu proggie....
Replies: 4
Views: 283

Re: Atom software archive menu proggie....

... Atom run on? It's basically a Nucleo64 board but I replaced the STMF103, with an F105, as it has the same pinout, but more RAM (64K instead of 20K), and does USB OTG which I ... master/menu/menu.bas Cheers. That should help. Phill.
by daveejhitchins
Fri Aug 24, 2018 7:33 am
Forum: hardware
Topic: Converting ABR to EEPROM (28C256) for the Master
Replies: 20
Views: 896

Re: Converting ABR to EEPROM (28C256) for the Master

... out to find out what's been going on with my Master. I started to have crashes/freezes, just ... managed to complete a project for Arcadian: a board to host one or two ROM images fitted in an ... LoadROM This program is used to load a RAM bank with an image stored on the current filing ...
by daveejhitchins
Sat Aug 11, 2018 1:48 pm
Forum: hardware
Topic: Converting ABR to EEPROM (28C256) for the Master
Replies: 20
Views: 896

Converting ABR to EEPROM (28C256) for the Master

... just removing the battery and replacing the SRAM with the 28C256 Flash/EEPROM worked. The ABR for the Master seems to be causing me problems :? First I tried ... of Sideways Rom? - although I haven't one of Spro's boards I have my ARA II board. They're a little tricker ...