Search found 1079 matches

by dp11
Wed Apr 08, 2020 1:05 am
Forum: 8-bit acorn hardware
Topic: New SCSI Host Adaptor
Replies: 89
Views: 2535

Re: New SCSI Host Adaptor

Might be worth trying hoglets code again with the new cable.
by dp11
Tue Apr 07, 2020 9:46 pm
Forum: 8-bit acorn hardware
Topic: New SCSI Host Adaptor
Replies: 89
Views: 2535

Re: New SCSI Host Adaptor

For a normal bus you need three conditons for each bit 1) HighZ ( not driving the bus ) 2) Logic zero 3) Logic one condition 1 is usually used to stop driving the bus to enable the other end to drive the bus ( e.g. all 8 bits aren't driving) For your open collector bus you also in the same order nee...
by dp11
Sun Apr 05, 2020 12:56 pm
Forum: 8-bit acorn hardware
Topic: New SCSI Host Adaptor
Replies: 89
Views: 2535

Re: New SCSI Host Adaptor

I think this is already implemented in the code? // SCSI device databus bidirectional control wire [7:0] scsi_nDATA_in; wire [7:0] scsi_nDATA_out; // Here the input and output of the databus needs to be tied together // since the Acorn SCSI host adapter will drive the BBC databus output // latch fr...
by dp11
Sun Apr 05, 2020 12:29 pm
Forum: 8-bit acorn hardware
Topic: New SCSI Host Adaptor
Replies: 89
Views: 2535

Re: New SCSI Host Adaptor

I think this is already implemented in the code? // SCSI device databus bidirectional control wire [7:0] scsi_nDATA_in; wire [7:0] scsi_nDATA_out; // Here the input and output of the databus needs to be tied together // since the Acorn SCSI host adapter will drive the BBC databus output // latch fr...
by dp11
Sat Apr 04, 2020 9:52 pm
Forum: development tools
Topic: If you have the lattice tools installed the next version of windows doesn't install
Replies: 0
Views: 229

If you have the lattice tools installed the next version of windows doesn't install

Just a note for hardware people who have the lattice tools installed . It appears the next release of windows 10 won't install. Uninstalling the tools doesn't appear to be enough as the the license manager appears to leave a driver behind which cause the problem. I had to use a program call driver s...
by dp11
Thu Apr 02, 2020 4:25 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

Thanks for the extra info. That should be fixable.
by dp11
Wed Apr 01, 2020 10:29 pm
Forum: acorn atom and acorn system series
Topic: Coding question
Replies: 14
Views: 567

Re: Coding question

If you are using BASIC look up the OPT directive.

If you are using an assembler make sure your forward reference are less <128 bytes away.
by dp11
Wed Apr 01, 2020 9:05 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

The Beebscsi utility should still work. How does scsijuke not work?
by dp11
Wed Apr 01, 2020 6:04 pm
Forum: 8-bit acorn hardware
Topic: Master Turbo / 65c102 copro info required
Replies: 6
Views: 415

Master Turbo / 65c102 copro info required

Request for information. I would like to hear from people with a real Master Turbo 65C102 board. I would like to know about the resistor pack on he right hand side. My board has a 220R resistor pack. The circuits on mdfs have 39R . Could people fill in below or post a photo? Serial number ULA type R...
by dp11
Tue Mar 31, 2020 7:49 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

It is a known issue that the Datacentre interferes with M5000. See viewtopic.php?f=3&t=17222&p=238568&hili ... re#p238568
by dp11
Sat Mar 21, 2020 2:33 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

PiTubeDirect does support those Pis. You will find a pi zero is faster than both of those pis for the fast 6502.
by dp11
Sat Mar 21, 2020 2:10 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

The 1MHz code doesn't support 1B or 2B . 2B might work with a recompile.
by dp11
Wed Mar 18, 2020 9:51 pm
Forum: upcoming (and recent) other events + general event chat
Topic: Virtual ABug?
Replies: 22
Views: 1364

Re: Virtual ABug?

Let's give it ago. Google Hangouts or meets could be used.
by dp11
Tue Mar 17, 2020 10:11 am
Forum: 8-bit acorn hardware
Topic: Help with a test on M5000 required
Replies: 2
Views: 223

Re: Help with a test on M5000 required

Thanks very much for confirming. I suspect it is some sort of bug/ race condition
by dp11
Mon Mar 16, 2020 12:11 am
Forum: 8-bit acorn hardware
Topic: Help with a test on M5000 required
Replies: 2
Views: 223

Help with a test on M5000 required

Could some kind person with a real M5000 do a quick test for me?

Start M5000 playing music. Then do *dump large file e.g. *dump anhf

Does the music stop play a little way into the file?
by dp11
Fri Feb 28, 2020 11:11 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 63
Views: 2363

Re: Odd Peripheral Goings-On With RPi4

From what I understand not all frequencies are possible.
by dp11
Fri Feb 28, 2020 5:19 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 63
Views: 2363

Re: Odd Peripheral Goings-On With RPi4

What are your overclock settings ? you may need to up the overvoltage setting.
by dp11
Fri Feb 28, 2020 4:00 pm
Forum: 32-bit acorn hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 843

Re: Acorn AKA20 We32206 Floating Point Co-Processor

FPEPC only moves results across domains with LD ST instructions so if you do lots of trig one after another you can get a good speed increase.

I don't think I ever tested the AMD so it may not even boot.
by dp11
Fri Feb 28, 2020 3:19 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 63
Views: 2363

Re: Odd Peripheral Goings-On With RPi4

have you rebooted ? I think you might have to reboot for it to take effect.
by dp11
Thu Feb 27, 2020 12:48 pm
Forum: 32-bit acorn hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 843

Re: Acorn AKA20 We32206 Floating Point Co-Processor

Yes WSS sold it. I have the builds and source code in the loft. I'll dig it out if you are interested.
by dp11
Wed Feb 26, 2020 6:06 pm
Forum: 32-bit acorn hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 843

Re: Acorn AKA20 We32206 Floating Point Co-Processor

On the RIscPC I did write the software to using the x86 card as the FPU. So if you have an 586-133MHz card that is probably the fastest FP Acorn machine.
by dp11
Sat Jan 25, 2020 3:14 pm
Forum: 8-bit acorn hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 144
Views: 11443

Re: Raspberry Pi to 1MHz bus interface

Pi1MHz mustn't be late in servicing the FIQ request. From memory the Pi USB interface makes use of the FIQ handler too. It might be possible to use one of the spi network interface chips. Especially as the pi zero doesn't have a network interface.
by dp11
Tue Jan 21, 2020 11:50 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

It should be possible to add the pull up in software on the pi and still only have one build.
by dp11
Sat Jan 18, 2020 7:30 pm
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

Lots of music 5000 links in this thread

viewtopic.php?f=2&t=15780&hilit=Music+5000
by dp11
Sat Jan 18, 2020 11:57 am
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

The nmi and irq will be open collector outputs and so you will need a pullup resistor to see them go high.
by dp11
Sat Jan 18, 2020 12:08 am
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

Good work I assume the diodes for nmi and irq are on the bottom and are the correct way round?
by dp11
Thu Jan 16, 2020 4:34 pm
Forum: 8-bit acorn hardware
Topic: BeebSCSI 7_7
Replies: 229
Views: 11048

Re: BeebSCSI 7_7

Thanks , now fixed on the Pi1MHz build. I'll look at updating to the latest version of FatFS at some point as it have some exFAT fixes.
by dp11
Tue Jan 14, 2020 10:32 am
Forum: 8-bit acorn hardware
Topic: BeebSCSI 7_7
Replies: 229
Views: 11048

Re: BeebSCSI 7_7

Looks like a recent version of ffconf.h hasn't been checked in.

Though I haven't tested Pi1MHz build the code base for Pi1MHz looks okay.
by dp11
Mon Jan 13, 2020 10:05 am
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 7419

Re: New Raspberry Pi to 1MHz bus interface

I haven't tested the current consumption of the PiZero, but I would expect it to be quite low. HDMI output is disabled. The screen therefore isn't moving large amounts of video data out of RAM. Most of the code sits in cache.

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