Search found 946 matches

by dp11
Thu Aug 22, 2019 7:45 pm
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

Mesa issue will be fixed in 19.2. They're aiming to have a release ready by the 10th of September. So shortly afterwards there should be a Pi release.
by dp11
Sun Aug 18, 2019 9:38 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

Excellent thanks for letting me know.
by dp11
Sat Aug 17, 2019 5:22 pm
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

It's possible that fix was back ported into the drive raspberry pi released to fix libre office.
by dp11
Sat Aug 17, 2019 12:02 pm
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

The only reason I think the fix is in the latest driver is that libre office works. I will try and investigate.
by dp11
Sat Aug 17, 2019 9:31 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

I'm pretty sure that fix is in the latest driver.
by dp11
Sat Aug 17, 2019 9:13 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

I did miss that thread. Thanks for the pointer
by dp11
Sat Aug 17, 2019 9:02 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

If they are happy to help can they see if the pointer in libre office works. Ie just to confirm that they have the latest driver. I'll ask my friends at pi if they know of anything else.
by dp11
Fri Aug 16, 2019 11:10 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

I don't know about OR and AND, but I suspect they are also fixed. The driver certainly has had the XOR fix for a while now.
by dp11
Fri Aug 16, 2019 11:04 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

Pizero will be fine. I don't have all the figure to hand , but PiZero(w) ( ARM1176JZF-S ARMv6 1GHz $5.00 to $10.00 +TAXes ) armcode 6502 : 290MHz RPi3B+ ( Cortex A53 ARMv8 1.4GHz $35.00 + TAXes ) RPi3A+ ( Cortex A53 ARMv8 1.4GHz $25.00 + TAXes ) should work but untested armcode 6502 : 339MHz lib6502...
by dp11
Fri Aug 16, 2019 10:33 am
Forum: emulators
Topic: Raspberry Pi 4
Replies: 22
Views: 750

Re: Raspberry Pi 4

Sadly the Raspberry Pi 4, running Raspbian Buster, currently has a graphics driver bug (the glLogicOp function is broken) which affects BBC BASIC for SDL 2.0 ; specifically the OR, AND and XOR plotting modes (GCOL 1 to GCOL 4) don't work. This causes issues in the IDE and a number of the supplied e...
by dp11
Sun Aug 11, 2019 9:54 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

*FX 151,230,11 is PDP-11 on PiTubeDirect
by dp11
Sun Aug 11, 2019 9:10 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

As only one core is used and video output is not used., I've not seen the temp go above 55c.

PiTubeDirect turns of throttling.
by dp11
Sun Aug 11, 2019 8:19 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

I'm currently using my Pi4 Powered off my master, but the master doesn't have much load. Looking around the internet I see some people are over clocking the Pi4 to 2GHz others get a lees of a boost. Might be worth a try if you want even more performance.
by dp11
Sun Aug 11, 2019 12:55 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

I've had a few spare minutes and done a bit more work on the Pi4. On the dom_tmp_1 branch I've improved the the 6502 performance for the RPi4. RPi3B+ (1.4GHz) armcode 6502 : 339MHz lib6502 : 131.56MHz Z80 86.78MHz ARM 151.46MHz nativeARM : 20,735MHz RPi4 ( 1.5GHz) armcode 6502 : 370MHz lib6502 : 237...
by dp11
Mon Aug 05, 2019 4:17 am
Forum: hardware
Topic: Pi Tubedirect
Replies: 41
Views: 1344

Re: Pi Tubedirect

Try *ex.! Boot
by dp11
Sat Jul 06, 2019 2:54 pm
Forum: software: other
Topic: How does BeebAid turn off ROMs?
Replies: 8
Views: 318

Re: How does BeebAid turn off ROMs?

Just writing to the last 24bytes is unlikely to work. I suspect it fiddles with the ROM byte in zero page
by dp11
Fri Jul 05, 2019 9:54 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

The no fit resistor is part of a voltage divider that turned out not to be needed.

The pdf contains a 3d image that you can rotate so you need real acrobat.
by dp11
Mon Jun 24, 2019 6:05 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1153
Views: 115710

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

PiTubeDirect now supports the new Raspberry Pi4 (see :https://www.raspberrypi.org/products/raspberry-pi-4-model-b/) My work so far should be considered as beta. Cores programmed in C see a good performance increase . Arm native core is now so fast some work is needed on the CLOCKSP program as I get ...
by dp11
Fri May 31, 2019 6:37 pm
Forum: hardware
Topic: 1MHz bus and JIM interoperability
Replies: 65
Views: 2050

Re: 1MHz bus and JIM interoperability

I think IRQs when FCFE downwards is used may need some thought.
by dp11
Mon May 20, 2019 8:23 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

It is clear to me that I'm a bit slow at ordering and sending out hardware kits . Does anyone want to support / take over that hardware supply? I still want to support this and future projects. If someone could take the load off me I can focus on development work.
by dp11
Thu May 09, 2019 9:48 pm
Forum: off-topic
Topic: Scope upgrade (MSO5104)
Replies: 5
Views: 534

Re: Scope upgrade

by dp11
Tue May 07, 2019 4:53 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

Sorry been a bit snowed under. Should hopefully get back on to it at the weekend.
by dp11
Sun May 05, 2019 7:12 pm
Forum: programming
Topic: The BASIC Word-wrap Challenge! (BBC BASIC)
Replies: 11
Views: 594

Re: The BASIC Word-wrap Challenge! (BBC BASIC)

tackling the problem in a different way. You might compress the word strings to a single byte say and have a lookup table from byte to word which also contains the length of the word. This does limit you to a dictionary of 255 words with the 256th being end of string say, but you'd get smaller and f...
by dp11
Sun May 05, 2019 10:46 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 805

Re: Help Needed with 6502 Second Processor

try unplugging an replugging the 40pin tube connector a few times. We have seen oxide on the pins cause problems as they haven't been used in 30+years
by dp11
Mon Apr 29, 2019 6:00 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

I've just updated the code on Github. This fixes an issues where the FIQ handler could be evicted from the cache on Pizero, which then meant it might not respond quickly enough if other internal bus activity was occuring. I would recommend everyone to upgrade , especially if they are using the hardd...
by dp11
Sun Apr 28, 2019 4:48 pm
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 161
Views: 6013

Re: BeebSCSI 7_7

Help required Attached is a BASIC speedtest test program. It needs a lot of tidying up. It might be revealing a problem. Please could people test it but don't use an ADFS partition that you care about. I have seen issues where it causes a crash after about 3minutes. I would be interested to know if ...
by dp11
Wed Apr 24, 2019 9:37 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

Sorry for the silence . I'll be ordering some bits soon. I have no plans to make assembled boards, I have no issue in someone else assembling boards. I've been busy with some other things. I can confirm my SDCARD has a read performance of 93KB/s . Write speed is much slower 33KB/s. This could possib...
by dp11
Tue Apr 23, 2019 3:49 pm
Forum: software: other
Topic: Toggling binary bits
Replies: 6
Views: 478

Re: Toggling binary bits

Look up EOR
by dp11
Mon Apr 22, 2019 8:20 pm
Forum: general
Topic: Function Key Strips BBC Master
Replies: 4
Views: 275

Re: Function Key Strips BBC Master

I've seen this on Facebook too. Looks excellent. With the latest PiTubeDirect release the 65c02 is upto 291MHz
by dp11
Thu Apr 18, 2019 6:34 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 85
Views: 4797

Re: Raspberry Pi to 1MHz bus interface

Prebuilt images and source code are now on github. https://github.com/dp111/Pi1MHz . The average user just needs to copy the firmware directory to the root of an SDCARD. Code needs some more comments and tidying ( help wanted) If someone want to add extra peripherals and doesn't understand how to fr...