Search found 754 matches

by dp11
Fri May 18, 2018 5:35 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Just tried running CLOCKSP on native ARM and rpi3b+. Unfortunately it is too fast and gives a divide by zero error as the time for the floating point test <10mS . I guess the speed result to be around 19-20GHz as bas135 floating point is much faster than BASIC II on a beeb.
by dp11
Fri May 18, 2018 5:06 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Pi3b+ is much faster. Timings from memory for fast 6502 Pi2 slower than pizero Pizero 290MHz Pi3 290MHz Pi3B+ 336MHz I have some more speed increases in the pipeline that take the 3b+ to 340MHz. The original acorn external 6502 copro was 3MHz so 3b+ is over 110 times faster. Other cores see a speed ...
by dp11
Fri May 04, 2018 6:24 pm
Forum: hardware
Topic: Mouse X Y doesn't work
Replies: 5
Views: 361

Re: Mouse X Y doesn't work

A few common problems :

1) the cable has breaks in it.
2) the photo diodes have muck on them.
3) the pots need adjusting.( simplest way to do this is with a scope you are aiming for a 50:50 square wave when you move the mouse at a constant speed.
by dp11
Wed May 02, 2018 8:31 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 65
Views: 3727

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

Under windows use the bash shell . Roughly follow the instructions here :https://github.com/hoglet67/PiTubeDirect/wiki/Build-dependencies
by dp11
Sun Apr 22, 2018 7:47 pm
Forum: introduce yourself
Topic: Decompiler Expert Just Joined
Replies: 12
Views: 582

Re: Decompiler Expert Just Joined

Thanks for the new download.
by dp11
Sun Apr 22, 2018 7:35 am
Forum: introduce yourself
Topic: Decompiler Expert Just Joined
Replies: 12
Views: 582

Re: Decompiler Expert Just Joined

Welcome .

I've failed to decompile your website. What should I download ? on the downloads page : " RevEngE6502 Demo Version Installer (Windows 95,98,XP etc) (also, this program expires 23rd June 2016)"

How do I get a real version ?

Which ARMs do you support ? ARMv6 ARMv7 ARMv8?
by dp11
Sun Apr 08, 2018 1:59 pm
Forum: hardware
Topic: Testing Beeb's analogue port
Replies: 17
Views: 652

Re: Testing Beeb's analogue port

If you want to see a little more about leakage causing problems : https://www.youtube.com/watch?v=dftkoD7LG0A
by dp11
Mon Apr 02, 2018 9:52 am
Forum: off-topic
Topic: My Wife
Replies: 39
Views: 1469

Re: My Wife

Such sad news. I'm pleased you felt able to share this news with us at such a difficult time.
by dp11
Sat Mar 31, 2018 9:05 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 105
Views: 4085

Re: Prince of Persia

The 6502 co pro on PiDirectTube there is also the option of of extra banked RAM (1Mbyte)
by dp11
Mon Mar 26, 2018 5:57 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

All the work is checked into the "egg-eater-dev" dev branch not "easter egg" which doesn't exist. Dave built it yesterday from github to test and spotted an issue which was fixed. Hoglet bigEd and myself are in regular contact over the project.
by dp11
Sun Mar 25, 2018 9:18 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Excellent. NB Basic IV is perfectly fine to use and as you can see effectively faster.
by dp11
Sun Mar 25, 2018 8:54 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Standard ROM would be fine. Just *conf. lang <romnumber>
by dp11
Sun Mar 25, 2018 8:48 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

BigEd beat me to it. I run on a master using the internal tube . I have BASIC II in a ROM for timing purposes. I might sometime have to have a more physically stable test rig as I've regularly swapping between Pis
by dp11
Sun Mar 25, 2018 2:58 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91277

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

With the release of a new raspberry pi ( RPi3B+) it is time for a new release of PiTubeDirect to support it. Highlights of this beta release : Added support for RPi3B+ Static Analysis tidying up Fast 6502 performance increased to about 290MHz for PiZero and 336MHz for RPi3B+ Simplified config.txt to...
by dp11
Thu Mar 22, 2018 3:38 am
Forum: hardware
Topic: Which pin on the Microvitec CUB socket is the composite in?
Replies: 8
Views: 382

Re: Which pin on the Microvitec CUB socket is the composite in?

A standard cub doesn't do composite in. You need an extra Pcb which is rare.
by dp11
Sun Mar 11, 2018 6:08 pm
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 106
Views: 7534

Re: ZX Spectrum next... Anybody backing ?

I'd still be interested to see the EMC test results.
by dp11
Fri Mar 09, 2018 7:38 am
Forum: other vintage computer hardware, software and games
Topic: PiZeroSCSI
Replies: 3
Views: 236

Re: PiZeroSCSI

I've seen it before. What I'd like to do is if I get time is a 1MHz bus version of pitubedirect interface giving a hard drive and music 5000 emulator all on a pizero. I've done some of the basic thinking about this.
by dp11
Wed Mar 07, 2018 3:54 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 150
Views: 6450

Re: SpectROM - Speccy emulator for the Pi co-pro

Oprions

At compile time of pitubedirect we know the pi type. We could put that info at a known memory location which could be read.

I suspect by writing and reading some io device you can work out which pi you are on.
by dp11
Sun Mar 04, 2018 4:37 pm
Forum: software: new games
Topic: Thoughts on StarWars for the beeb
Replies: 20
Views: 876

Re: Thoughts on StarWars for the beeb

For PiTube direct LDA &FFE1:LDX &FFE1 will be fine as as there is 1.5uS between reads, but this is currently a case that we don't check for in testing.
by dp11
Sun Mar 04, 2018 9:16 am
Forum: software: new games
Topic: Thoughts on StarWars for the beeb
Replies: 20
Views: 876

Re: Thoughts on StarWars for the beeb

The spec says if you are reading a FIFO you need 10.5us between reads. Pitubedirect will be quicker than this but almost certainly not back to back.
by dp11
Sun Mar 04, 2018 8:44 am
Forum: hardware
Topic: Electron ULA Schematics
Replies: 43
Views: 2806

Re: Electron ULA Schematics

They would have been the test chips.
by dp11
Sun Mar 04, 2018 1:26 am
Forum: software: new games
Topic: Thoughts on StarWars for the beeb
Replies: 20
Views: 876

Re: Thoughts on StarWars for the beeb

PiTubeDirect hasn't been tested for back to back reads as that is against the tube spec. It almost certainly won't work.
by dp11
Sat Mar 03, 2018 11:10 pm
Forum: hardware
Topic: Channel Errors
Replies: 4
Views: 230

Re: Channel Errors

That's all useful info.

Can you try using a different file system either. e.g adfs
by dp11
Sat Mar 03, 2018 10:20 pm
Forum: hardware
Topic: Channel Errors
Replies: 4
Views: 230

Re: Channel Errors

A few questions

Which build of PiTubeDirect are you running?
Which Tube signal converter are you using ?
by dp11
Sat Mar 03, 2018 6:50 pm
Forum: hardware
Topic: Electron ULA Schematics
Replies: 43
Views: 2806

Re: Electron ULA Schematics

IIRC there are some of the CF ULAs at the cambridge computer museum. Theres are in ceramic packages so much easier to photo.
by dp11
Sat Mar 03, 2018 6:01 pm
Forum: software: new games
Topic: Thoughts on StarWars for the beeb
Replies: 20
Views: 876

Re: Thoughts on StarWars for the beeb

7 address lines on an external tube connector
3 address lines on an master internal tube connector
by dp11
Wed Feb 28, 2018 7:37 pm
Forum: general
Topic: BBC ADC Analogue port wiring
Replies: 6
Views: 334

Re: BBC ADC Analogue port wiring

tricky : you are correct the diagram is wrong your magenta changes are correct.

crj: vref is set by the 3 diodes so around 1.8v.
by dp11
Sun Feb 11, 2018 7:25 pm
Forum: hardware
Topic: Mega Games Cartridge (MGC) MK II Hardware Development
Replies: 30
Views: 1347

Re: Mega Games Cartridge (MGC) MK II Development

Does MISO need a pull resistor?