Search found 2871 matches

by Prime
Tue Sep 01, 2020 6:59 am
Forum: 8-bit acorn hardware
Topic: Pegasus 400 board traces.
Replies: 22
Views: 3039

Re: Pegasus 400 board traces.

I did a full count of cases I have in the loft and didn't find as many as I thought! So any new AP3/4 design could have a new case design leaving 61 available for new Pegasus 400s. Dave, If you can lend me a case I can see if I can whip of a design in FreeCAD, to generate an stl so those of us with...
by Prime
Wed Aug 19, 2020 7:46 am
Forum: acorn atom and acorn system series
Topic: My first Atom....
Replies: 26
Views: 1099

Re: My first Atom....

From the scrambled video image, I'd say part of the problem is the connection between 8255 and 6847,as the 8255 sets the video mode and other lines on the video chip. Could also be that it's not being initialized correctly. Yeah and those white Acorn fitted sockets are pretty crappy, I've ended up r...
by Prime
Sun Aug 16, 2020 7:16 am
Forum: acorn atom and acorn system series
Topic: This looks odd
Replies: 13
Views: 981

Re: This looks odd

I would posit that the black cased Atoms with the switch on the top right of the keyboard facia are the LED sign machines. The CCH machine lacks this switch and would seem to be a genuine pre-production example. Except (from memory) it's also an Issue 4 or 5 motherboard, I had it apart at the last ...
by Prime
Tue Aug 11, 2020 5:34 pm
Forum: 8-bit acorn software: other
Topic: How PROC and FN references are built in BASIC
Replies: 9
Views: 399

Re: How PROC and FN references are built in BASIC

Though I guess gosubs can probably be improved by putting them at the beginning of the program with the most frequently used first.

Cheers.

Phill.
by Prime
Tue Aug 11, 2020 11:03 am
Forum: 8-bit acorn hardware
Topic: Kenda "The Professional" DMFS
Replies: 64
Views: 1836

Re: Kenda "The Professional" DMFS

Not very professional making a product that can't be repaired if it goes wrong...... One obsevation is I don't think you're gonna read anything through the 24 pin socket, it's not connected to 3 of the data lines, (D2, D3 and D4), so Data must be coming out through the 40 pin socket. More than likel...
by Prime
Thu Aug 06, 2020 7:36 am
Forum: development tools
Topic: Looking for a 6502 disassembler for reverse engineering
Replies: 24
Views: 3172

Re: Looking for a 6502 disassembler for reverse engineering

Perhaps I should have the control file loader bail, or at least warn the user if no cpu is defined.

Or maybe default to 6502 and also issue a warning, in case you where trying to process 6809 code.....

Cheers.

Phill.
by Prime
Tue Aug 04, 2020 7:03 am
Forum: 8-bit acorn hardware
Topic: XC95144-100 Development Board
Replies: 17
Views: 739

Re: XC95144-100 Development Board

Good way of spotting bridges, and checking for alignment of pins after tacking the corners is to hold the board up with a strong light behind it. makes it much easier to spot. But to echo the comments of others, that looks good for a first attempt. If you are worried about burning through too many x...
by Prime
Mon Jul 27, 2020 7:02 am
Forum: general
Topic: Alan Turing Worth Fifty Quid...
Replies: 13
Views: 1638

Re: Alan Turing Worth Fifty Quid...

I really cannot understand what one does in one's bedroom has got to do with anyone except the people/things [sh*gging a BBC Model B, anyone?] taking part in whatever inwith the bedroom. Whilst I mostly agree with this..... Alan Turing should not have been pardoned: the act of pardoning presumes so...
by Prime
Fri Jun 19, 2020 4:36 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 3005
Views: 343770

Re: LOLPRICE

How about £16 for a *SINGLE* Apple mac keycap.....plus £14 "shipping"

https://www.ebay.co.uk/itm/1984-Apple-M ... 4126966768

Cheers.

Phill.
by Prime
Tue Jun 09, 2020 5:34 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

I think I've found a bug in the 6809 core on the Godil. If you set a write to memory watch, it always lists the written data as $FF With the following watches set : >> blist 0: FF90 mask FFFF: Mem Wr Watch (trigger: Always) 1: FF92 mask FFFF: Mem Wr Watch (trigger: Always) 2: FF93 mask FFFF: Mem Wr ...
by Prime
Sun Jun 07, 2020 11:15 pm
Forum: 8-bit acorn hardware
Topic: different Versions of the 6522?
Replies: 6
Views: 565

Re: different Versions of the 6522?

The thing that this makes me wonder..... Why on *EARTH* would you want to make something that's designed to be connected to a CPU interrupt line anything other than open drain / collector? Doesn't that rather defeat the ability to share an interrupt line between multiple sources, without additional ...
by Prime
Sun May 24, 2020 4:36 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1692

Re: XC9500XL phaseout

Pretty sure WinCUPL is free now. It still *appears* that they're going to charge you for a license but the download screen just gives you a license key you can use straight away. Though it is um full of 'features' I wish Atmel / Microchip would either fix it, update it or open source it so we can f...
by Prime
Sat May 23, 2020 11:31 am
Forum: acorn atom and acorn system series
Topic: Crystal replacement
Replies: 5
Views: 448

Re: Crystal replacement

I've used low profile ones for both the 4MHz and the 3.57MHz ones on a couple of my Atoms, I pretty much supply a low profile 4MHz with a RAMROM these days as even the reasonable sized normal crystal will foul with it.

Cheers.

Phill.
by Prime
Sat May 23, 2020 9:40 am
Forum: other vintage hardware, software and languages
Topic: negative voltage generator module.
Replies: 2
Views: 297

negative voltage generator module.

Hi all, Does anyone know where I can get a negative voltage generator module** needs to be able to generate approx 100-200mA at either -5V or -12V (not both at the same time) from an input of +5 or +12 respectively. **I want a reputable supplier, so am not interested in Aliexpress, Bangood etc. An e...
by Prime
Fri May 08, 2020 10:48 pm
Forum: 8-bit acorn hardware
Topic: Cumana/Mitsubishi disk drive repair
Replies: 3
Views: 270

Re: Cumana/Mitsubishi disk drive repair

To be honest, the drive is probably toast. You may be able to get the head stuck back on the top assembly but you have a 99.9999% chance of it being out of correct alignment. Oh it might appear to read, write and format correctly but you'll probably not be able to use disks written in it (to the top...
by Prime
Thu May 07, 2020 9:30 am
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

hoglet wrote:
Thu May 07, 2020 7:29 am
You need to switch to the dev branch before building. Either do a "git checkout dev" before you build, or use the -b dev option to clone)
Cheers Dave, that seems to have done it :)

Phill.
by Prime
Wed May 06, 2020 11:31 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

Ahh that would probably do the trick though doesn't seem to be in the version (of the 6809) I have loaded onto the godil, but that's 0.7x and I notice the current is 0.98....guess it's time to update :) Right just cloned the github, modified target\common\Makefile.inc to suit windows then went into...
by Prime
Tue May 05, 2020 6:09 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1692

Re: XC9500XL phaseout

The Lattice ispLEVER Classic says it costs but still seems to be free. I had to renew my licenses (1 year license had expired) and the direct link to get a free license still works... the 4256V dev boards are cheap. Right I'll download it and see if I can get a free license if just to evaluate. Hum...
by Prime
Tue May 05, 2020 12:48 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1692

Re: XC9500XL phaseout

Lattice still make plenty of 5V tolerant CPLDs and they were always similar or cheaper to the Xilinx equivalents. Mircochip (Atmel) still make 5V CPLDs. But both seem to charge for their development software licenses, or have buggy software, I'm looking at you Atmel WinCUPL! Was looking at evaluati...
by Prime
Mon May 04, 2020 11:30 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1692

Re: XC9500XL phaseout

I have just ordered two pieces @Farnell. On the Dutch website they are still cheap: https://nl.farnell.com/search?st=XC9572xl Yeah they where still reasonable on the UK farnell site too.... I refuse to buy Chinese CPLD's as it went wrong twice. One time I ordered XC9572XL and I got them but in the ...
by Prime
Mon May 04, 2020 11:27 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1692

Re: XC9500XL phaseout

I actually emailed Digikey about this, as DragonMMC, DragonDiag, and several of my Acorn related projects use them. This is the reply I got : "Thank you for your inquiry. I checked with our Cost Administrator and she said Xilinx substantially increased their price on this part on March 30, but they ...
by Prime
Sat May 02, 2020 10:41 pm
Forum: general
Topic: I wonder what this contains?
Replies: 18
Views: 1261

Re: I wonder what this contains?

Just spotted this : "Over 20 massive Gigabytes of Retro Fun" is that as opposed to "20 small gigabytes" LOL

Cheers.

Phill.
by Prime
Fri May 01, 2020 4:08 pm
Forum: software & utilities for the pc, mac or unix
Topic: Isit possible to use my KRYOFLUX to write BBC disks?
Replies: 7
Views: 959

Re: Isit possible to use my KRYOFLUX to write BBC disks?

I was at one point compiling an Excel sheet of PC motherboards that would read/write/format single density floppy disks. It's interesting to note that there seemed to be some that would read and write but not format which was odd, but you could of course get round that by formatting on the beeb firs...
by Prime
Mon Apr 27, 2020 7:49 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

Something similar already exists - the command is called "next": https://github.com/hoglet67/AtomBusMon/wiki/User-Manual---Command-Reference#next-n It can be used to skip over subroutines or out of some loops. It would be very easy to extend it to take an optional address, and use that instead of t...
by Prime
Mon Apr 27, 2020 12:43 am
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

I have a feature request.....

A go command that you specify an address to and it goes until that address. Essentially an on the fly breakpoint usefull where you want to skip
say a subroutine, but don't want to go through all the hassle of manually setting a breakpoint.

Cheers.

Phill.
by Prime
Mon Apr 27, 2020 12:37 am
Forum: 8-bit acorn software: other
Topic: Beebdis bug report
Replies: 2
Views: 339

Re: Beebdis bug report

I find Beebdis incredibly useful, Glad to hear that, I recently used it to disassemble Dragondos 2.f, so I've been tinkering with it recently. I thought I pushed the latest to github, I'll check tomorrow. I discovered what looks to be a bug with versions 1.20 and 1.25 - the "stringscan" function do...
by Prime
Fri Apr 24, 2020 10:28 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 971
Views: 97650

Re: ICE T65/Z80/6809

Hi all,

Is there a current recommended FPGA board as last time I looked I couldn't find the epizza board for sale anymore?

Cheers.

Phill.
by Prime
Wed Apr 22, 2020 11:17 am
Forum: acorn atom and acorn system series
Topic: System 1 clone behaving oddly
Replies: 9
Views: 890

Re: System 1 clone behaving oddly

Couple of things to bear in mind if you are using the WD65C02.... You correctly seem to have a jumper on Pin 1, as this is GND on a normal 6502, but an output on the WD. Do you have pullups on IRQ, NMI and BE ? Also this note from the datasheet RE: PHI2 : "Phase 2 In (PHI2) is the system clock input...
by Prime
Sun Apr 19, 2020 11:08 pm
Forum: off-topic
Topic: install a OS on a laptop with only USB?
Replies: 4
Views: 410

Re: install a OS on a laptop with only USB?

got a Panasonic CF18 toughbook with now a blank working 60GB hard disc in caddy. Obviously has no floppy or CD player, so the Q is, how do I do it :? Surely can't just shove in a USB stick into the port as no drivers will be installed to see it. Depends on the laptop, most modern ones will boot fro...
by Prime
Wed Apr 15, 2020 6:52 pm
Forum: off-topic
Topic: EPROM / Flash programmer.
Replies: 1
Views: 312

EPROM / Flash programmer.

Asking for a friend**,

What is that cheapish EPROM / Flash programmer that some of you use, or can you recomend one please. Ideally needs to be able to program the 39SF010A flash roms I tend to use....

**I personally have an expensiveish Wellon VP590.

Cheers.

Phill.

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