Search found 6353 matches

by hoglet
Tue Oct 17, 2017 9:01 pm
Forum: hardware
Topic: Electron ULA Schematics
Replies: 16
Views: 558

Re: Electron ULA Schematics

I've just had a second email from Harry: Hi - good to see the ULA schematics have excited some attention! I had another go at scanning. Hopefully a bit better this time. I also found a sheet detailing some of the special I/Os. The scans are taken from 2nd generation A4 photocopies so there probably ...
by hoglet
Sun Oct 15, 2017 5:52 pm
Forum: hardware
Topic: WE 32K RAM Card Repair
Replies: 37
Views: 1265

Re: WE 32K RAM Card Repair

I've got a question though - if I make up a new cable, what sort of maximum length can it be? At the moment it's about 30cm which makes taking the lid off the machine awkward. However, if I make it longer, could this introduce problems? I guess it's not buffered like a Tube cable... Actually, on th...
by hoglet
Sun Oct 15, 2017 5:38 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

I've done a few more bits and bobs on this today. I've sorted the unreliability (hanging) I was seeing with the Cypress CY7C68013A development board. It turned out that the sigrok fx2lafw firmware image I had built was faulty. Why? Because the 8051 assembler on Ubuntu 14.04 (SDCC 3.3) has a bug that...
by hoglet
Sun Oct 15, 2017 9:58 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

BigEd wrote:There is one case which could be straightforward and should be useful: if the PC is presently unknown, and you're about to write the annotation for a JSR or an interrupt. The current PC is, suddenly and at the last minute, known!

Agreed, and I will add that this morning.

Dave
by hoglet
Sun Oct 15, 2017 7:45 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Actually thinking about it while going back would be great. Just setting the JSR address to the two writes gives the user in the disassembly the clue of where you have come from. Might also be worth checking the address stored with the predicted address when you think you know that the instruction ...
by hoglet
Sat Oct 14, 2017 9:43 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

this is amazing work. The pc calculation is very clever. You could also work backwards [once] you know the first true address to fill in the blanks as the JSR stacks where you currently are, the same for IRQ. actually I think a double or triple write will contain the address of where you currently ...
by hoglet
Sat Oct 14, 2017 5:36 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Part 5 now updated... Time for Strictly :shock:
by hoglet
Sat Oct 14, 2017 4:10 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

this is amazing work. The pc calculation is very clever. You could also work backwards ofne you know the first true address to fill in the blanks as the JSR stacks where you currently are, the same for IRQ. actually I think a double or triple write will contain the address of where you currently ar...
by hoglet
Sat Oct 14, 2017 2:19 pm
Forum: off-topic
Topic: Learning to use a logic sniffer
Replies: 12
Views: 1245

Re: Learning to use a logic sniffer

roland wrote:AFAIK there is no protocol analyser that reads the captured data and shows is like an assembler listing.

There is now.... :D

See this thread:
http://www.stardot.org.uk/forums/viewto ... 42#p182742

sigrok5.png
by hoglet
Sat Oct 14, 2017 2:15 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Parts 1..4 now updated.
by hoglet
Sat Oct 14, 2017 12:08 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Part 5: Using an uber-cheap FX2LP development board The postman has just delivered a £12.49 Cypress FX2LP development board which can be used as a 16-channel logic analyzer. I bought this from Hobby Components: http://hobbycomponents.com/cypress/674-hobby-components-cy7c68013a-16ch-logic-analyser H...
by hoglet
Sat Oct 14, 2017 11:18 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Part 4: Synchronous capture, triggers and sigrok-cli I've already noted that capture memory in the current Logic Sniffer is very limited. When sampling 16 channels, the maximum capture depth is 12,288 samples. It turns out this is only about 680 instructions. So how can we capture more data with Lo...
by hoglet
Sat Oct 14, 2017 11:18 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Part 3: Writing a 6502 Protocol Decoder A protocol decoder in sigrok transforms data from one representation to another (usually higher) representation. A good example of this is decoding the SPI serial bus: Pd_spi_example.png In the above, the line labelled SPI at the top is the higher level repre...
by hoglet
Sat Oct 14, 2017 11:18 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Re: Open Source Logic Analyzer Experiments

Part 2: Probing the 6502 with Sigrok I've connected the following wires up to the 6502 on my Master 128: - D0..D7 - RnW - Sync - Rdy - Phi2 - IRQn - NMIn - RSTn That's a total of 15, plus a ground, so there is just one spare. I should say that the Open Bench Logic Sniffer supports 32 channels, but ...
by hoglet
Sat Oct 14, 2017 11:17 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 19
Views: 365

Open Source Logic Analyzer Experiments

Morning all, This thread is all about using Logic Analyzers to debug 6502 based systems. I'll break it into several parts to make it manageable, and so I don't hit forum image limits. Part 1: An Introduction to Sigrok and Logic Sniffer Over the last couple of days, with some help from BigEd, I've be...
by hoglet
Fri Oct 13, 2017 8:40 am
Forum: other vintage computer hardware, software and games
Topic: Exidy Sorcerer
Replies: 23
Views: 367

Re: Exidy Sorcerer

Jon,

Was the original ROM a 2716 EPROM? Have you tried just erasing it and reprogramming it?

Dave
by hoglet
Fri Oct 13, 2017 6:26 am
Forum: general
Topic: Where is everyone? An information gathering topic
Replies: 96
Views: 10407

Re: Where is everyone? An information gathering topic

John Ferguson wrote:Tried to show my location on the map but could not find the symbol to add to the map.

Make sure you are logged into your google account, then click edit in the top left corner.
by hoglet
Thu Oct 12, 2017 7:07 am
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

If you use a laptop to load and save games etc. does it matter if the ground connections for the microphone and earphone connections on the laptop are joined together? Actually, my cable only allows for loading. But in general it should be fine to connect the two grounds together. If you check with...
by hoglet
Wed Oct 11, 2017 4:33 pm
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

Sorry John, I attached the wrong file above. I've now re-attached the catalogue spreadsheet. The latest Atom Software Archive can be found here: https://github.com/hoglet67/AtomSoftwareArchive/releases Here's a link to .wav files of Invaders and Snapper: https://www.dropbox.com/s/bc3pewm4urdtz0z/ato...
by hoglet
Wed Oct 11, 2017 12:20 pm
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

John Ferguson wrote:On cassette please.

Choose a couple of games from the catalogue and I'll make them into .wav files for you:
AtomSoftwareCatalog.zip
(70.03 KiB) Downloaded 4 times

Dave
by hoglet
Wed Oct 11, 2017 7:25 am
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

I am wondering whether it is possible to get some games for my Atom. Search the forum for "atm2wav" (written by Charlie Robson) An .atm file is the format many of the Atom Emulators use. atmtowav will convert this back to a .wav file that can be "played" into the cassette input....
by hoglet
Wed Oct 11, 2017 6:36 am
Forum: hardware
Topic: Beeb FPGA
Replies: 323
Views: 19234

Re: Beeb FPGA

noggin wrote:Thanks for that info Dave - will be running Windows.

As far as I understand, Quartus II version 13.0 SP1 is the latest version of Quartus that includes synthesis support for the old Cyclone II FPGA on the DE1.

So make sure you download that, rather than the latest version.

Dave
by hoglet
Tue Oct 10, 2017 3:31 pm
Forum: general
Topic: if you make me mad, i will
Replies: 42
Views: 971

Re: if you make me mad, i will

danielj wrote:(of which there are 2000 every second)!

Actually 2,000,000 every second!
by hoglet
Tue Oct 10, 2017 3:27 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 323
Views: 19234

Re: Beeb FPGA

Is the Altera Programmer Software called Quartus II - or is there another utility? I’ve got the Control Panel software from a download from the Terasic site. Are you on Windows? On my system the programmes can be invoked as a standalone application, called "Quartus II 13.0sp1 Programmer" ...
by hoglet
Tue Oct 10, 2017 12:37 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 323
Views: 19234

Re: Beeb FPGA

hoglet - I also may have a DE1 available to play with. I'm starting from zero experience with FPGAs (I last worked in this arena writing very simple logic with PLAs and PALs c.1992, compiling the logic code on a VAX and writing it on a VT220-clone...) - is there a good 'How to' for installing BeebF...
by hoglet
Tue Oct 10, 2017 7:38 am
Forum: hardware
Topic: FleaFPGA Ohm board and BBC hardware 'emulation'?
Replies: 3
Views: 186

Re: FleaFPGA Ohm board and BBC hardware 'emulation'?

Or is SDRAM a deal breaker? It would require a major rewrite of my BeebFpga project, as that relies on very fast SRAM to be able to support features like an integrated 6502 Co Processor. I think the MIST BBC core does manage to work with SDRAM, so that might be a possible starting point: https://gi...
by hoglet
Sun Oct 08, 2017 7:42 pm
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

Does anyone know where I can get a list of commands for the floating point Rom? Atomic Theory and Practice, Chapter 22 (Extending the Atom): http://stardot.org.uk/forums/viewtopic.php?p=62322#p62322 Floating-Point Statements COLOUR, FDIM, FIF, FINPUT, FPRINT, FPUT, FUNTIL, STR Floating-Point Functi...
by hoglet
Sun Oct 08, 2017 4:12 pm
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

John Ferguson wrote:Can you tell me how to fix this? Do I need a new speaker.

It's possible that capacitor C5 needs replacing.

If you look at the speaker circuit on the schematic (linked in my post earlier) it's quite simple.

Dave
by hoglet
Sun Oct 08, 2017 11:49 am
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

Even if the 6502 processor is removed (i.e. no code at all running) you should still get some video output like this: 250da296f9ed7e3e3538bfb548248d6ebd7d9322.JPG What you see here is the 2114 Video RAM chips initialized to random values on power up. I would start by checking there is power to the a...
by hoglet
Sun Oct 08, 2017 10:57 am
Forum: introduce yourself
Topic: Acorn Atom not working
Replies: 45
Views: 634

Re: Acorn Atom not working

Oh, and Welcome! (above post edited a bit)

Go to advanced search