Search found 694 matches

by KenLowe
Sun Dec 10, 2017 11:12 am
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

RobC wrote:The F4 usage will call OS_ReadLine/OSWORD 0 and get a correctly terminated string. I'm wondering whether OSARGS on the GoSDC also does this but other filing systems don't?
I've just tried on GoSDC with patched DFS 2.26 and I still get the same error.
by KenLowe
Sun Dec 10, 2017 10:49 am
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

hoglet wrote:My guess is this is an MMFS bug with OSARGS. I'll try to confirm that later.

Dave
I also get the same error with RetroClinc RamFS.
by KenLowe
Sat Dec 09, 2017 9:39 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1159
Views: 120911

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

If you are just going to use pi zeros ( of either type) then you can just set the frequency to 1000MHz. I'm a bit confused. I removed the # from the arm_freq line, and now the RPiZeroW just doesn't boot. # clock frequency override # all pis bar zero W default to the correct frequency uncomment for ...
by KenLowe
Sat Dec 09, 2017 9:18 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

Ken: I do have Dave/Arcadian's old *broken* IntegraB board here. I've not looked at it yet but I could try to get it working to see if I get the same issues... I've just checked my systems, and it's a PiZeroW in both machines, both with Diamondback RC2, and both running at 700MHz. And without doing...
by KenLowe
Sat Dec 09, 2017 9:01 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

I've just tried this on another machine with a different RPi, and MMFS instead of SWMMFS, and the screen refresh is working ok. I'll try and narrow it down a bit. Edit: So, I've just checked, and it's a PiZeroW in both machines, both with Diamondback RC2, and both running at 700MHz. And without doin...
by KenLowe
Sat Dec 09, 2017 8:58 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1159
Views: 120911

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

dp11 wrote:Do you have a Pizero or PizeroW ?

If you have a ZeroW then in the config.txt you will need to set the speed to 1000MHz
I've got both Zero and ZeroW, but I'm not sure which RPi is in which machine! I'll need to check.
by KenLowe
Sat Dec 09, 2017 8:38 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1159
Views: 120911

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

I update my post to show it was a Pi Zero. I guess I did this as you were responding. I need to stop editing my posts!
by KenLowe
Sat Dec 09, 2017 8:22 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1159
Views: 120911

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

The github home page indicates that the ARMnative CoPro should run at 1000Mhz, but the latest Diamondback RC2 reports it running at 700Mhz on my system. Is this correct?

Edit: Ah. I'm thinking this might be because I'm running it on a RPiZero?
by KenLowe
Sat Dec 09, 2017 8:04 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

Ken: What happens if you just do *BAce (i.e. without any arguments)? Do you see the cursor/prompt and are you able to enter commands? I don't get any prompt. I just get a blank screen. I am able to enter commands, I just can't see what I'm typing on screen (unless I press F3 and then any key to get...
by KenLowe
Sat Dec 09, 2017 7:15 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

Duh. Again, I've done an edit just as you've posted!
by KenLowe
Sat Dec 09, 2017 6:56 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

For some reason I just can't see anything I type (other than the Fx commands). After doing the F4 METEORS. If I blindly type (occasionally pressing F3 and then anykey, to see what I've actually typed): load asteroids g it does load the file, but the screen just doesn't refresh. Again, if I press F3 ...
by KenLowe
Sat Dec 09, 2017 6:33 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

I'm using SWMMFS. I've also just edited my initial post with some more info.
by KenLowe
Sat Dec 09, 2017 6:18 pm
Forum: hardware
Topic: Jupiter Ace emulator
Replies: 43
Views: 2417

Re: Jupiter Ace emulator

Thanks for this! I've just tried it, but can't get it to work properly. Not sure if it's something I'm doing (or not doing). If I do a *BAce Meteors, I get a Bad String message. If I do a *BAce without any filenames I get a blank screen. If I press F4 I can get the ability to enter a filename. If I ...
by KenLowe
Sat Dec 09, 2017 1:16 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

I've just installed a few of these 29C256 flash ICs into my BBC+, and they're working great :) Very little modification was required to get them working.The only thing I needed to do was disconnect pin 1 from each flash, and reroute this to nW on the main board (equivalent to nWDS on the old Beeb). ...
by KenLowe
Wed Dec 06, 2017 12:13 am
Forum: hardware
Topic: ZX81 emulator
Replies: 48
Views: 3615

Re: ZX81 emulator

This is very cool ...once I figured out how to get it running =D> =D>. For those that are struggling, with the latest PiTubeDirect Diamondback RC2 release running on the RPi: >*FX151,230,15 (to start the ARMnative CoPro) Ctrl-Break arm>*zx81 (assuming you've got the zx81.ssd image loaded onto a fili...
by KenLowe
Thu Nov 30, 2017 12:24 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

in the end I favoured the 28C256 because (I think) at least at that time four years ago, it was harder to source non-dubious examples of the former and they were much more expensive. A lot of my electronic component purchases come from China (via ebay), but fortunately I've been very lucky and neve...
by KenLowe
Wed Nov 29, 2017 8:48 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

I might actually try some 29C256 flash memory instead to see if it works any better. For anyone that's interested, my batch of AT29C256 flash memory arrived today from China, and is also working perfectly in my IntegraB. Unlike the AT28C256 which is pin compatible with 32K SRAM, the AT29C256 is ess...
by KenLowe
Wed Nov 29, 2017 6:24 pm
Forum: hardware
Topic: LCD TVs and monitors for use with BBCs
Replies: 186
Views: 70395

Re: LCD TVs and monitors for use with BBCs

This looks like the Maplin one, for which there are a few auctions on ebay. My Cub monitor decided to give up the ghost today so I'm debating whether to go for a solution like this - I see there's a similar device on Amazon for £23.99. Would that be suitable? Malc I'm not sure if that one supports ...
by KenLowe
Mon Nov 27, 2017 1:16 pm
Forum: hardware
Topic: What are these called?
Replies: 15
Views: 1176

Re: What are these called?

This outfit is quoting for them @ £5.59 each (+ £12 shipping - or free shipping if your order is > ~£33). I'm guessing VAT will be on top:

https://www.digikey.co.uk/products/en?k ... PA-640-T-N
by KenLowe
Fri Nov 17, 2017 2:01 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

...and I was only driven down the route of using SUM because of the issues I was having with the LOCK command, otherwise I wouldn't have been looking at the SUM command either. Edit: I'll get on and sort it as soon as I've got a handle on the 32k SUM issue too... 8) Having had a quick look through t...
by KenLowe
Fri Nov 17, 2017 7:54 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

The workaround pending a fix if folk still want to use LOCK and UNLOCK is to do as Ken found and carry out each lock or unlock command twice in succession because the characteristic of an $FF EOR is to restore the original byte every two operations. That will only work for the UNLOCK. For LOCK, the...
by KenLowe
Thu Nov 16, 2017 11:47 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Because of the latter though, soft-locking became less useful and since you must use hardware write-protect, in the short term you can just not use the facility Indeed, that's exactly what I'm doing. I’ll have a look at the code to see what’s going on. I’ll check the summing process too if you thin...
by KenLowe
Thu Nov 16, 2017 10:44 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Will do re RnW/WnR. Please also see my edit on the previous post about where the corruption is happening, and a possible theory.

Edit: I'm seeing exactly the same 'corruption' using RnW & WnR.
by KenLowe
Thu Nov 16, 2017 9:40 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

To confuse matters, I think there's an issue with EEP32 SUM command. It looks like the wrong upper bank is being used to calculate the checksum (under some circumstances - in this case with the EEPROM in banks A&E): 20171116_213358.jpg Regardless of the issue with calculating the checksum of the upp...
by KenLowe
Thu Nov 16, 2017 9:21 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Hi, I was aware of the glitches that can occur when trying to write to the ROM when soft locked, which is why I have WP switches on all the EEPROM banks. However, the issue I have is a bit different. If I read the checksum from the EEPROM when unlocked, I get a different result compared to when I re...
by KenLowe
Thu Nov 16, 2017 6:41 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Still with the EEPROMs in my IntegraB board, but interestingly: <CTRL><BREAK> >*EEP32 UNLOCK AB EEPROM Locked Unlocking... Ok >*EELOAD BASICED A Programming : $BFFF Verifying : $BFFF Checksum-32 = $001A9F48 Finished. >*EELOAD HIBASIC B Programming : $BFFF Verifying : $BFFF Checksum-32 = $001C2E4F Fi...
by KenLowe
Thu Nov 16, 2017 10:53 am
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

@Ken - Are you also using the EEP32 OFF switch prior to locking/unlocking and programming? Short answer is no. I wasn't aware of that switch. I'll try that this evening and report back. it would lend credence to hoglet Dave's suggestion regarding hooky and/or suspect devices I'm fairly sure there's...
by KenLowe
Wed Nov 15, 2017 11:33 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Right. I *think* I'm getting to the bottom of my issues. I suspect the *EEP32 LOCK command is corrupting the lower bank. If I program the ROM then do a soft lock, I get issues with the ROM in the lower bank. If I program the ROM and leave it unlocked, then the ROM in the lower bank seems to work fin...
by KenLowe
Wed Nov 15, 2017 11:19 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 42555

Re: EEPROM - the Holy Grail of Sideways Rom?

Are you using the correct EEP: If *EELOAD gives a message "EEPROM Locked", this indicates that the EEPROM has been "soft-locked"; this is an extra (and TODO: optional?) level of protection in addition that provided by the write-protect switch. You need to use the *EEP16 or *EEP32 command to unlock i...
by KenLowe
Wed Nov 15, 2017 7:08 pm
Forum: hardware
Topic: MMFS Development and Support
Replies: 923
Views: 64538

Re: MMFS Development and Support

Thanks for the feedback. I have a bunch of other ROMs installed, so I disabled all the non essentials, and MMFS started working fine. I was then able to narrow it down to Master ROM (Beebug) which I have temporarily installed in one of the sockets. It turns out this ROM also processes the FREE and M...