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by dp11
Sun May 31, 2020 9:16 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1841

Re: Pi1MHz Software

I've add a bit more support to make the video a bit more like a beeb. There is a hint of Mode 7 support and a hint on NuLA. Ellipse plotting doesn't match the beeb, infact lots of the PLOT command need a bit of work. The video stuff does need a bit of a tidy up. I'd sort of like to get on with other...
by dp11
Sun May 31, 2020 8:17 pm
Forum: 32-bit acorn hardware
Topic: CPU overclocking
Replies: 6
Views: 495

Re: CPU overclocking

You want !ARMSI
by dp11
Sun May 31, 2020 1:14 pm
Forum: programming
Topic: Adding in negative numbers
Replies: 12
Views: 594

Re: Adding in negative numbers

LDA&81 ; bytes 2 cycles 3 TAX; CLC ; bytes 1 cycles 2 ADC&86 bytes 2 cycles 3 STA&81 ; bytes 2 cycles 3 BCC done ; bytes 2 cycle 2/3 TXA BMI dechighbyte INC &82; bytes 2 cycles 5 BNE done .dechighbyte DEC &82 ; bytes 2 cycles 5 .done In the negative-offset case, that code DECs when the carry is set...
by dp11
Sun May 31, 2020 12:17 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1841

Re: Pi1MHz Software

DSI won't work currently , it might be possible.
by dp11
Sun May 31, 2020 11:34 am
Forum: programming
Topic: Adding in negative numbers
Replies: 12
Views: 594

Re: Adding in negative numbers

So you want something like this

Code: Select all

LDA&81 ; bytes 2 cycles 3
TAX;
CLC  ; bytes 1 cycles 2
ADC&86 bytes 2 cycles 3
STA&81 ; bytes 2 cycles 3
BCC done ; bytes 2 cycle 2/3
TXA
BMI dechighbyte
INC &82;   bytes 2 cycles 5
BNE done
.dechighbyte
DEC &82 ;   bytes 2 cycles 5
.done
by dp11
Sun May 31, 2020 11:01 am
Forum: programming
Topic: Adding in negative numbers
Replies: 12
Views: 594

Re: Adding in negative numbers

LDA&81 ; bytes 2 cycles 3 CLC ; bytes 1 cycles 2 ADC&86 bytes 2 cycles 3 STA&81 ; bytes 2 cycles 3 LDA&82; bytes 2 cycles 3 ADC#0 ; bytes 2 cycles 2 STA&82 ; bytes 2 cycle 3 total 13 bytes , 19 cycles so you can do this : LDA&81 ; bytes 2 cycles 3 CLC ; bytes 1 cycles 2 ADC&86 bytes 2 cycles 3 STA&...
by dp11
Sat May 30, 2020 9:45 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1841

Re: Pi1MHz Software

If you what to do stuff from the co pro you have to use legal accesses to the 1MHz bus
by dp11
Sat May 30, 2020 8:39 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1841

Re: Pi1MHz Software

Only Pizero kernel.img at the moment . I'll do a full build soon.
by dp11
Sat May 30, 2020 3:35 pm
Forum: 8-bit acorn software: other
Topic: Mini-challenge: colour-coded digit display
Replies: 3
Views: 519

Re: Mini-challenge: colour-coded digit display

While we have eight real colours. Plotting yellow and white next to each other gives cream. I wonder if you can do that within a digit?
by dp11
Sat May 30, 2020 1:32 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1841

Pi1MHz Software

I've just pushed a Beta version of the Pi1MHz software. The big change is how the underlying sampling of the 1MHz bus is done. This increases performance in a few low level areas. This has enabled me to add a frame buffer. I've used code from other people to support the frame buffer so I can't take ...
by dp11
Wed May 27, 2020 4:31 pm
Forum: programming
Topic: Incrementing a 2-byte number
Replies: 14
Views: 886

Re: Incrementing a 2-byte number

The more masochistic cycle-counter might do... ........ cut .................... ; constant time ; 15c ; total ; 12 bytes :wink: I'll raise you this code : INC &70 ; 5c BEQ inchigh ; 2/3c BNE skip1 ;3c .skip1 BNE done ;3c .inchigh INC &71 ; 5c .done ; constant time ; 13c ; total ; 10 bytes if I hav...
by dp11
Mon May 25, 2020 5:47 pm
Forum: 8-bit acorn hardware
Topic: BBC master fault any thoughts welcome
Replies: 12
Views: 568

Re: BBC master fault any thoughts welcome

I was thinking if the battery doesn't have an internal diode it might be dragging down the PSU, but looking at the circuits unless it is an early master I don't think this is likely.
by dp11
Mon May 25, 2020 2:33 pm
Forum: 8-bit acorn hardware
Topic: BBC master fault any thoughts welcome
Replies: 12
Views: 568

Re: BBC master fault any thoughts welcome

My First guess would the battery. What do you know about the battery? Try disconnecting the battery and resetting the CMOS does it remember the setting across a CTRL break ?
by dp11
Sun May 24, 2020 12:52 pm
Forum: 32-bit acorn software: other
Topic: Is software for 32bit Acorn hardware dead?
Replies: 13
Views: 1198

Re: Is software for 32bit Acorn hardware dead?

No Software isn't dead. just most 32bit people live : https://www.riscosopen.org/content/
by dp11
Fri May 22, 2020 11:19 am
Forum: programming
Topic: Equb equw equd etc
Replies: 24
Views: 1907

Re: Equb equw equd etc

You can post a link to Google drive or something similar.
by dp11
Thu May 21, 2020 11:28 pm
Forum: programming
Topic: Equb equw equd etc
Replies: 24
Views: 1907

Re: Equb equw equd etc

can you post the full code ?
by dp11
Thu May 21, 2020 11:03 pm
Forum: programming
Topic: Equb equw equd etc
Replies: 24
Views: 1907

Re: Equb equw equd etc

because .sl is already defined somewhere else ?
by dp11
Wed May 20, 2020 8:56 am
Forum: programming
Topic: Autobahn in Ample
Replies: 8
Views: 462

Re: Autobahn in Ample

Pi1MHz emulates the M5000 and either plays via the Pis headphone jack or the beebs internal speaker.
by dp11
Sun May 10, 2020 8:42 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 950

Re: Pi1MHz future supported devices

I think Prisma 3 might be possible , there are a few step required before this is possible. I'm working on these steps in the background. I will need help !

Teletext how do people imagine this working ? A preset number of pages on the SDcard ( e.g. 1000 pages is only 1Mbyte SDCARDs are big !)
by dp11
Sat May 09, 2020 10:54 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 950

Pi1MHz future supported devices

This is just for me to gain ideas of what people might like. I have a few things in the pipeline. This does not represent a promise of might come or what might be possible.
by dp11
Thu May 07, 2020 8:44 pm
Forum: 8-bit acorn hardware
Topic: Sideways RAM expansion
Replies: 28
Views: 1266

Re: Sideways RAM expansion

Are if you are using the same area of RAM as the MUSIC5000 it might start making a noise.
by dp11
Thu May 07, 2020 7:03 pm
Forum: 8-bit acorn hardware
Topic: Sideways RAM expansion
Replies: 28
Views: 1266

Re: Sideways RAM expansion

I can't obviously see why the RAM disk would be cleared on BREAK.
The noise might just be because there is more activity on the 1MHz bus.
by dp11
Tue May 05, 2020 10:27 pm
Forum: other events + general event chat
Topic: Calendar for future virtual events
Replies: 9
Views: 623

Re: Calendar for future virtual events

Feature Request : iCAL feed for events ?

https://en.wikipedia.org/wiki/ICalendar
by dp11
Mon May 04, 2020 11:19 pm
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1695

Re: XC9500XL phaseout

Just looking at Xilinx latest quarterly report says the core products account for 30% of revenue . core products are classed as : Virtex-6, Spartan-6, Virtex‐5, CoolRunner‐II, Virtex-4, Virtex-II, Spartan-3, Spartan-2, XC9500 products, configuration solutions, software & support/services. Advanced p...
by dp11
Mon May 04, 2020 2:31 pm
Forum: 8-bit acorn hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 144
Views: 15119

Re: Raspberry Pi to 1MHz bus interface

The click is the Music5000 emulation starting . The next release should support disabling various emulations. For now set M5000_BeebAudio_Off=1 in cmdline.txt
by dp11
Mon May 04, 2020 2:29 pm
Forum: 8-bit acorn hardware
Topic: BeebSCSI 7_7
Replies: 241
Views: 16678

Re: BeebSCSI 7_7

I'm more than happy to try and debug the issue. I need an image with all the software needed to reproduce it and step by step instructions .
by dp11
Sun May 03, 2020 2:37 pm
Forum: 8-bit acorn hardware
Topic: BeebSCSI 7_7
Replies: 241
Views: 16678

Re: BeebSCSI 7_7

They may be more than one problem that have similar effect.
by dp11
Sun May 03, 2020 2:18 pm
Forum: 8-bit acorn hardware
Topic: BeebSCSI 7_7
Replies: 241
Views: 16678

Re: BeebSCSI 7_7

Debug alters the timing, it is possibly that without DEBUG enabled the code is returning too quickly for the x86.

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