Search found 2537 matches

by Prime
Thu Sep 20, 2018 10:43 am
Forum: acorn atom
Topic: System 6809 ROM
Replies: 1
Views: 102

System 6809 ROM

Hi all, I've just created a git repository of the source to the Acorn 6809 card ROM : https://github.com/prime6809/System6809 This was created from disassembilies of the MAME copy of the 6809 card's ROM and a copy dumped from the machine at the CfCH at the recent ABUG meetup. Comments are largely ta...
by Prime
Tue Sep 18, 2018 2:34 pm
Forum: hardware
Topic: My first (large) CPLD steps (XC9572)
Replies: 7
Views: 214

Re: My first (large) CPLD steps (XC9572)

Just to clarify one point about voltakes that tripped me up. VCCIO can be run at or BELOW the vcccore voltage so for a XC9572XL chip they'll need to run at 3.3V, input levels are however 5V tollerent. Output levels will however only be up to VCCIO, this hasn't generally been a problem in any of the ...
by Prime
Mon Sep 17, 2018 9:36 pm
Forum: hardware
Topic: AP3-4 - Redesign - First Thoughts
Replies: 23
Views: 857

Re: AP3-4 - Redesign - First Thoughts

Dave, If you want my Gotek re-implementation schematic drop me an email / pm. It's similar to the published schematic but I used a 74LS07 instead of the LS04 + mosfets. Also used a pair of sil resistors as pullups. Designed to plug onto the System's floppy controller so has jumpers for drive select ...
by Prime
Fri Sep 14, 2018 2:09 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 31
Views: 806

Re: New hardware suggestion - Pi econet server

I thought I remember someone had made the hardware and was working on the software (for an Econet server) for one of the ARM boards that seem to ba available now. Could have been one of the STM32 boards, but I could be wrong. Edit: This is what I was thinking of..... https://stardot.org.uk/forums/vi...
by Prime
Wed Sep 12, 2018 9:23 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Leicester) 9-11 November 2018 - BOOKING NOW on THIS THREAD
Replies: 45
Views: 666

Re: ABUG EAST MIDLANDS (Leicester) 9-11 November 2018 - BOOKING NOW on THIS THREAD

Yeah I should be there, it fortunately avoids Lesley's birthday the week before and my brother's wedding the week after.

Cheers.

Phill.
by Prime
Mon Sep 10, 2018 9:51 pm
Forum: acorn atom
Topic: System Cards....
Replies: 0
Views: 86

System Cards....

Hi All, Sorry, I'm crap with names, who was it that gave me a bunch of System cards at the weekend and who's 80 Col card I tested (and could not get working). Could you perhaps post a picture of either side of the 80 col board please, I suspect the reason we could not get it working is that it isn't...
by Prime
Mon Sep 10, 2018 8:06 am
Forum: archive submissions
Topic: Roms dumped at ABUG Sept 2018
Replies: 0
Views: 152

Roms dumped at ABUG Sept 2018

Hi all, Here's the roms that we dumped at the ABUG meetup, though pernod has already posted some of these. Included : Serveral versions of the Acorn Communicator ROMS. An early (we think pre-production) version of the Electron MOS. The Mertec Companion ROM The Care Smart Cartridge ROM A couple of Sy...
by Prime
Thu Sep 06, 2018 10:38 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 203
Views: 6943

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

Anything anyone wants me to bring along to the show, apart from the normal soldering irons eprom programmers etc?

Cheers.

Phill.
by Prime
Wed Sep 05, 2018 10:00 am
Forum: emulators
Topic: MAME: Atom
Replies: 48
Views: 1479

Re: MAME: Atom

After *VDU1, text is always written to the 6845 screen and grahics to the 6847 screen. If you want text to output to 2 screens, you have to change the OSREAD and OSWRITE vectors to update 2 screens. Or of course directly write the characters to the video RAM.....handling the ASCII->6847 mapping man...
by Prime
Tue Sep 04, 2018 6:33 am
Forum: emulators
Topic: MAME: Atom
Replies: 48
Views: 1479

Re: MAME: Atom

I seem to remember that you needed to type *VDU (I think) to re-direct the output to the 40x25 teletext card, the command for it is in the original 8271 DOS rom.

Cheers.

Phill.
by Prime
Mon Sep 03, 2018 8:47 am
Forum: emulators
Topic: MAME: Atom
Replies: 48
Views: 1479

Re: MAME: Atom

So I've been adding the GDOS-2015 board to MAME and am curious about the Hardware test page. 0012.png I have SID connected but not detected, what is it looking for? How would it ever detect AtomDOS since the Hardware test ROM resides in the same location &E000? That version probably could not detec...
by Prime
Tue Aug 28, 2018 9:50 am
Forum: acorn atom
Topic: Atom software archive menu proggie....
Replies: 4
Views: 151

Re: Atom software archive menu proggie....

Right found it! The bug that was preventing it from working.....note to self, REPT is 8255 port c bit 6 not bit 0, so it thought the REPT key was constantly pressed....was stopping the AtoMMC CAT command working too.... Now on to the next bug why it won't load the selected program :) keeps just repo...
by Prime
Sun Aug 26, 2018 7:04 pm
Forum: acorn atom
Topic: Atom software archive menu proggie....
Replies: 4
Views: 151

Re: Atom software archive menu proggie....

Actually, only the chapter selection uses JSR OsRdCh. The text part of the menu uses JSR Inkey, where Inkey is: It also uses direct access to B001 and B002 for Up (Ctrl) Down (Shift) and Rept. Do these not work either? Right thanks for that will have a look. What hardware does your STM32 emulated A...
by Prime
Sun Aug 26, 2018 6:10 pm
Forum: acorn atom
Topic: Atom software archive menu proggie....
Replies: 4
Views: 151

Atom software archive menu proggie....

Hi all, The Text mode menu program in the Atom software archive, how does it read the keyboard, my little STM32 emulated Atom will boot the initial graphical screen, which will let you select "A for commercial, B for modern conversions etc" using A,B,C etc. But once the text mode menu is loaded it s...
by Prime
Sat Aug 25, 2018 4:21 pm
Forum: other vintage computer hardware, software and games
Topic: CRT repair
Replies: 5
Views: 250

Re: CRT repair

There's a TV repair shop near me in Radford Coventry that repaired our CRT TV a few years back.

FM TV Services.
189 Cheveral Ave
Radford
Coventry
CV6 3EN

Phone 024 7660 1093

Might be worth giving them a call.

Cheers.

Phill.
by Prime
Thu Aug 23, 2018 10:28 am
Forum: programming
Topic: sorta OT: C macros.....
Replies: 4
Views: 104

Re: sorta OT: C macros.....

hoglet wrote:
Thu Aug 23, 2018 9:08 am
Can you not just define your own custom version of that inline function:

Code: Select all

__STATIC_INLINE uint32_t LL_DMA_IsActiveFlag_TC1(DMA_TypeDef* DMAx)
{
  return (READ_BIT(DMAx->ISR, DMA_ISR_TCIF1) == (DMA_ISR_TCIF1));
}
Heheh that's what I did in the end.....

Cheers.

Phill.
by Prime
Thu Aug 23, 2018 8:45 am
Forum: programming
Topic: sorta OT: C macros.....
Replies: 4
Views: 104

sorta OT: C macros.....

Hi All, Doing some programming of the STM32 using GCC, and trying to make a generic macro so I can change SPI channels without having to change stuff all over the place. Anyway the STM libs define a bunch of functions to check the terminal count of the DMA channels named as such : __STATIC_INLINE ui...
by Prime
Tue Aug 21, 2018 3:03 am
Forum: emulators
Topic: Summary of emulators for 8bit acorns
Replies: 24
Views: 468

Re: Summary of emulators for 8bit acorns

It would be possible to add a subforum to the emulators forum for each system or emulator. So a subforum each for atom, beeb and electron or a subforum each for B-EM, Beebem, elkulator, electron etc. Would this be a useful addition? If so which would be the best way to do it? By system or emulator?...
by Prime
Mon Aug 20, 2018 8:10 pm
Forum: hardware
Topic: Can't get Gotek Flash Floppy working. u56=USB [SOLVED]
Replies: 42
Views: 1131

Re: Can't get Gotek Flash Floppy working. u56=USB

I've been using these for the most part: https://www.amazon.co.uk/dp/B01GK9921C I'm really confused as to the problem you're having - I've used loads of different memory sticks and they've all been fine. :? Yeah I'm using them too on Daniel's recommendation, and not had a problem, also used Kingsto...
by Prime
Wed Aug 15, 2018 8:43 am
Forum: hardware
Topic: Rrad only 8271!
Replies: 6
Views: 268

Re: Rrad only 8271!

I notice that in the Beeb, WR on the 8271 is pulled high quite aggressively with a 150 ohm resistor. All the drives will have open collector (or open drain) outputs for WP because they are all bussed. The 150R will create a half decent edge & keep a decent current flowing down the (potentially long...
by Prime
Tue Aug 14, 2018 11:04 pm
Forum: hardware
Topic: Rrad only 8271!
Replies: 6
Views: 268

Rrad only 8271!

Hi all, As part of overhauling and checking my recently aquired System 5 I have come across this strange problem I had with the drives, I could read disks perfectly well (even Gotec virtual disks), but could not write to them. After a series of tests I narrowed it down to the 8271 chip on the floppy...
by Prime
Tue Aug 14, 2018 10:44 am
Forum: acorn atom
Topic: Atom Speed test
Replies: 4
Views: 125

Atom Speed test

Hi all,

Is there an Atom speed test program that doesn't rely on the presence of the 6522?

I have a little something I need to benchmark.....

Cheers.

Phill.
by Prime
Tue Aug 14, 2018 9:48 am
Forum: off-topic
Topic: Juice 5000mA Power bank - Aldi
Replies: 4
Views: 309

Re: Juice 5000mA Power bank - Aldi

daveejhitchins wrote:
Tue Aug 14, 2018 8:19 am
Just to let people know: Aldi have a special-buy of a Juice brand 5000mA power bank for sale, from last Sunday, for £12.95 - half the price they are in Argus . . .
Did you mean Argos?

Cheers.

Phill.
by Prime
Sat Aug 11, 2018 11:48 pm
Forum: software: other
Topic: 6502 RAM test.....
Replies: 1
Views: 201

6502 RAM test.....

Hi all, Does anyone happen to have a routine to test RAM on a 6502, specifically an Acorn machine, source code would be wonderfull. Background, trying to trace the source of the RAM faults on the System 5 and finding Acorn's SYSTEST program rather lacking......yes you found failed nibbles in that ra...
by Prime
Fri Aug 10, 2018 9:23 pm
Forum: emulators
Topic: MAME Acorn System ROMS.
Replies: 4
Views: 263

Re: MAME Acorn System ROMS.

Cheers for the speedy reply, figured you'd have them :)

Are you going to be at the Cambridge meetup, if so I'll bring the CMS along with me for you to have a poke at :)

Cheers.

Phill.
by Prime
Fri Aug 10, 2018 9:01 pm
Forum: emulators
Topic: MAME Acorn System ROMS.
Replies: 4
Views: 263

MAME Acorn System ROMS.

Hi all,

Anyone know where I can get the romsets for the recently added (to MAME) Acorn System roms?

Cheers.

Phill.
by Prime
Sun Aug 05, 2018 6:22 pm
Forum: hardware
Topic: Floppy power connectors / cable...
Replies: 7
Views: 198

Re: Floppy power connectors / cable...

Cheers ordered some of the connectors IanS linked to along with some AWG20 wire which is what the floppy cable splitter I have here uses :)

Cheers.

Phill.
by Prime
Sun Aug 05, 2018 4:19 pm
Forum: hardware
Topic: Floppy power connectors / cable...
Replies: 7
Views: 198

Re: Floppy power connectors / cable...

I do likewise but I think this is the right housing: https://uk.rs-online.com/web/p/compact-power-connectors/6794732/ Yeah I normally hack old PC PSUs, but in this case the cables would need to be longer than they typically are..... That does look like the right housing, just gotta find the pins to...
by Prime
Sun Aug 05, 2018 3:46 pm
Forum: hardware
Topic: Floppy power connectors / cable...
Replies: 7
Views: 198

Floppy power connectors / cable...

Hi all, In playing around with the System 5 I seem to have damaged the floppy power cable, first noticed as it was smoking! I suspect that the insulation got damaged on the back of the cardcage and it shorted to something. Anyway does anyone know what the part numbers are of the 5.25" type floppy po...
by Prime
Tue Jul 31, 2018 6:24 am
Forum: acorn atom
Topic: Econet Card on Ebay
Replies: 13
Views: 450

Re: Econet Card on Ebay

It should be able to be shared, both the current version of AtoMMC and the Econet card only use 3 or 4 IO addresses. It's easier to move AtoMMC as we have the source code :) I did make a board that was a clone of the AtoMMC (I had Charlie's permission!) and a socket for a Master Econet module, worke...