Search found 1000 matches

by dp11
Wed Apr 08, 2020 10:02 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Excellent. But the really question is why ? is is because there is noise on bbc_INTnEXT signal which gets fed into the CPLD which upsets things when you need the extra pterms. Is there a subtle timing issue? or something else? If you are never going to use it internally then the extra ground pin on ...
by dp11
Wed Apr 08, 2020 9:28 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Could you try in the verlog setting bbc_INTnEXT low. This will reduce the number of pterms used on the tristate node. I wonder if there is some sort of timing issue. Not to sure how to do this as it's defined as an input? I could just get rid of that term altogether. Yep just get rid of the input d...
by dp11
Wed Apr 08, 2020 8:54 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

That looks fine. Can you look at the ground level again.
by dp11
Wed Apr 08, 2020 8:13 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Could you try in the verlog setting bbc_INTnEXT low. This will reduce the number of pterms used on the trisate node. I wonder if there is some sort of timing issue.
by dp11
Wed Apr 08, 2020 6:57 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Once open collector is working correctly , if you were to respin the board you can parallel up the outputs for more current.
by dp11
Wed Apr 08, 2020 6:42 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

can you try replacing the line

Code: Select all

	assign scsi_nDATA_in = (~scsi_InO) ? scsi_nDATA : scsi_nDATA_out;
with

Code: Select all

	assign scsi_nDATA_in = scsi_nDATA  ;
Which matches the original hardware.
by dp11
Wed Apr 08, 2020 4:24 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Could you try the build again. If it doesn't work could I have the report file again.
by dp11
Wed Apr 08, 2020 1:39 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

It look as though you have two pins scsi_INTnEXT scsi_nCONF which are outputs . On the Circuits these appear to be connected to pins which are grounded.
by dp11
Wed Apr 08, 2020 9:36 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

I've had a quick look but I can't find the specification for the maximum current in the Ground pin of CPLD. Might be worth checking you aren't exceeding it under the worst case. I notice the spare output pin are connected to ground. What you can do which might help slightly is set them to be outputs...
by dp11
Wed Apr 08, 2020 12:05 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

Re: New SCSI Host Adaptor

Might be worth trying hoglets code again with the new cable.
by dp11
Tue Apr 07, 2020 8:46 pm
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

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 11:56 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

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 11:29 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 75
Views: 1388

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 8:52 pm
Forum: development tools
Topic: If you have the lattice tools installed the next version of windows doesn't install
Replies: 0
Views: 112

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 3:25 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 125
Views: 4962

Re: New Raspberry Pi to 1MHz bus interface

Thanks for the extra info. That should be fixable.
by dp11
Wed Apr 01, 2020 9:29 pm
Forum: acorn atom and system
Topic: Coding question
Replies: 14
Views: 374

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 8:05 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 125
Views: 4962

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 5:04 pm
Forum: hardware
Topic: Master Turbo / 65c102 copro info required
Replies: 4
Views: 203

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 6:49 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 125
Views: 4962

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: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 125
Views: 4962

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: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 125
Views: 4962

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 events & exhibitions
Topic: Virtual ABug?
Replies: 22
Views: 1073

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: hardware
Topic: Help with a test on M5000 required
Replies: 2
Views: 203

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: hardware
Topic: Help with a test on M5000 required
Replies: 2
Views: 203

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: 2047

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: 2047

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: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 627

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.