Search found 1198 matches

by dp11
Mon Jul 06, 2020 9:32 pm
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 445
Views: 15709

Re: 8271 disc controller craziness -- do not try this at home!

I'm happy to decap and photo the die here in the UK.
by dp11
Sun Jul 05, 2020 8:42 pm
Forum: 8-bit acorn hardware
Topic: Overheating Woes
Replies: 12
Views: 595

Re: Overheating Woes

I would try creating a cmdline.txt file on the SDCARD with

Code: Select all

tube_delay=10
by dp11
Sat Jul 04, 2020 9:04 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1268
Views: 165691

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

Well done in getting it working. I'm surprised you need tube_delay on a Master, but hay it works.
by dp11
Fri Jul 03, 2020 8:57 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1268
Views: 165691

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

Try unplugging and replugging at the master end of the tube interface. I wonder if you have a slightly dirty connection
by dp11
Thu Jun 25, 2020 8:53 pm
Forum: 8-bit acorn hardware
Topic: BBC Master and Sideways RAM
Replies: 5
Views: 437

Re: BBC Master and Sideways RAM

The user guide and advanced user guide.
by dp11
Mon Jun 22, 2020 12:58 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 69
Views: 4119

Re: Odd Peripheral Goings-On With RPi4

My be worth creating a new sdcard image from scratch and try the update again.

Thing about waiting for Pi5 you might as well wait for Pi6 and so on.
by dp11
Sun Jun 21, 2020 10:00 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 69
Views: 4119

Re: Odd Peripheral Goings-On With RPi4

Though the Pi4 EEPROM is in Beta it has been well tested.
by dp11
Sun Jun 21, 2020 8:39 pm
Forum: off-topic
Topic: Odd Peripheral Goings-On With RPi4
Replies: 69
Views: 4119

Re: Odd Peripheral Goings-On With RPi4

You can do even better and not use an SD card.

https://www.raspberrypi.org/forums/view ... p?t=274595
by dp11
Fri Jun 19, 2020 8:02 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

Maybe because I'm juggling lots of things mentally atm but I'm not sure I follow you cal process. Could you do a little video of what you are doing and what is happening.
by dp11
Fri Jun 19, 2020 3:16 pm
Forum: 8-bit acorn hardware
Topic: BBC MASTER 128 Vs 512 ?
Replies: 9
Views: 481

Re: BBC MASTER 128 Vs 512 ?

Yes, Sorry to be clear the 512 is on the Copro
by dp11
Fri Jun 19, 2020 12:50 pm
Forum: 8-bit acorn emulators
Topic: B-Em
Replies: 498
Views: 51425

Re: B-Em

The big win with gcc 10.1 is the static analyser. I also use cppcheck ( 2.1) which has found problems for me in the past.

WSL2 , the file system I think they say can be 10times faster than WSL 1
by dp11
Fri Jun 19, 2020 7:28 am
Forum: 8-bit acorn emulators
Topic: B-Em
Replies: 498
Views: 51425

Re: B-Em

My build environment is now WSL2 on windows a I find it works very well and is very simple to use, a complete ubuntu/ debian system with little effort. My gcc 10 command line is something like : -Wall -Wextra -Wno-unused-parameter -Wnull-dereference -pedantic -Wall -Wcast-qual -Wno-deprecated-declar...
by dp11
Thu Jun 18, 2020 11:44 pm
Forum: 8-bit acorn emulators
Topic: B-Em
Replies: 498
Views: 51425

Re: B-Em

I would suggest if you aren't using gcc 10.1 you probably should. It is very good at picking up errors. Yes it can be a bit fussy but it does prevent some of the hard to find bugs occurring.
by dp11
Thu Jun 18, 2020 5:27 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

So what is happening ?
by dp11
Wed Jun 17, 2020 9:02 am
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

10 Address=&FD00 20 FOR Axis = 0 TO 5 30 ?(Address+Axis) = 128 40 NEXT Axis ?(x) = y is a write cycle The code is the same as 10 Address=&FD00 31 ?(Address+0) = 128 32 ?(Address+1) = 128 33 ?(Address+2) = 128 34 ?(Address+3) = 128 35 ?(Address+4) = 128 36 ?(Address+5) = 128 [/code] Notice how addre...
by dp11
Tue Jun 16, 2020 4:34 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

Be careful there are multiple IC401s in the Circuits.

If you are talking about page 57 of DEC 84 then IC401 according to the circuit symbols is an NAND gate. The table on that page is incorrect. A NAND gate is 74LS00 not 74LS04
by dp11
Tue Jun 16, 2020 12:57 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

Might be worth switching S300 a few times incase the contacts have tarnished.
by dp11
Tue Jun 16, 2020 9:22 am
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

Beebs either run at the correct speed or not at all. You can slow a beeb down if externally if NMI or IRQs are constantly occurring.
by dp11
Mon Jun 15, 2020 11:30 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

So all address are based at FD00 and not FC00.

Might be worth going back to some of your early tests using FD00.
by dp11
Mon Jun 15, 2020 8:45 pm
Forum: 8-bit acorn hardware
Topic: MENTOR ROBOT
Replies: 33
Views: 1222

Re: MENTOR ROBOT

Lets start at the beginning what position is LK8 in ? as this selects between FRED ( &FC00 base address) and JIM (&FD00 base address ) Circuits have the default to be FC00 where as you code examples have FD00. NB the article is wrong on DEC 84 page 54 JIM is FD00 and not FE00 The article page FEB 85...
by dp11
Mon Jun 15, 2020 11:19 am
Forum: 8-bit acorn hardware
Topic: A/B 6502 switcher project
Replies: 32
Views: 1400

Re: Random hardware thought

best way would be to add electronic switches controlled by a single switch.
by dp11
Mon Jun 15, 2020 10:45 am
Forum: 8-bit acorn hardware
Topic: A/B 6502 switcher project
Replies: 32
Views: 1400

Re: Random hardware thought

You would need to switch all the 6502 pins not just the power pins.
by dp11
Sun Jun 14, 2020 1:25 pm
Forum: programming
Topic: Indirect JMP "bug"
Replies: 9
Views: 743

Re: Indirect JMP "bug"

Interesting they kind of fixed it in 65c02, but now it's not backward compatible. Ranting is good ! :D Can't stand: 1 - Indirect Jumps :x - Whenever I see &6C in a disassembly, it's an instant putoff. Surely use a direct JMP and self mod the code: LDA VectorLB,X: STA Direct+1 LDA VectorHB,X: STA Di...
by dp11
Sun Jun 14, 2020 12:32 pm
Forum: 8-bit acorn hardware
Topic: TOP 5 interest of the RASP PI CO PRO ?
Replies: 71
Views: 2926

Re: CO PROCESSOR ON BBC MICRO ???????

You can also set the clock rate if you say want to see how fast something would be @ 10MHz, 20 MHz, 30MHz.
by dp11
Fri Jun 12, 2020 7:08 pm
Forum: 8-bit acorn hardware
Topic: Winchester Disk Power Supply - Component Failure
Replies: 5
Views: 302

Re: Winchester Disk Power Supply - Component Failure

Are you sure it isn't one of the near by rifa capacitors? Much more likely to failed. They can make a mess all over the place.
by dp11
Fri Jun 12, 2020 6:09 pm
Forum: 8-bit acorn hardware
Topic: Winchester Disk Power Supply - Component Failure
Replies: 5
Views: 302

Re: Winchester Disk Power Supply - Component Failure

If that part has failed you are one of the most unlucky people on the forum.

Why do you think it has failed?

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