Search found 8434 matches

by hoglet
Sun Sep 15, 2019 9:59 pm
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 44
Views: 2188

Re: The 8-Bit Guy's new 65816 based computer

roland wrote:
Sun Sep 15, 2019 9:41 pm
I wonder if we can ever get the source code of that Vera video board and see if we (actually Hoglet :mrgreen: ) can merge this into the AtomFPGA's.
I was wondering that as well, but I don't expect they will release the source.

Dave
by hoglet
Sun Sep 15, 2019 7:22 am
Forum: general
Topic: Today I received.....
Replies: 5409
Views: 416934

Re: Today I received.....

Elminster wrote:
Sat Sep 14, 2019 9:45 pm
One more for the collection.
That looks interesting, and is a new one on me.

Can you post a photo of the content page (maybe in a new thread...)?

Dave
by hoglet
Sat Sep 14, 2019 9:44 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

It seems the SD-521 is possibly only a 40 track drive, so be careful of using *FORM80. If the drive head seems to be trying to step beyond the end of the disk surface, hit BREAK quickly! Edit: Yes, it's refered to as a 360K DSDD 48 TPI, which will only be 40 tracks. So stick to *FORM40 I'm off out n...
by hoglet
Sat Sep 14, 2019 9:36 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

That looks promising.... Is there any manufacturer name / model number on either of the the disk drives, or on the case? Edit: Ah, I see from earlier in the thread that it's a SD-521. Let me google that.... Another command to try if you have formatted a disc successfully is *VERIFY <drive number> An...
by hoglet
Sat Sep 14, 2019 9:14 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

So, I have removed the ROM's from the boards, and the screenshot is what I get The unlabelled ROM in IC8 in the ROM board is almost certainly ADFS. (Edit: The Acorn part number 0201274-02 is definitely ADFS 1.30) Remove this, and reinsert the Watford DDFS ROM. Then try formatting a disc as outlined...
by hoglet
Sat Sep 14, 2019 9:02 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

To remove the ADFS I need to remove the DDB3 card Again, don't remove the DDB3 card, it's the only disk controller in ther system! ADFS will be one of the devices on the ROM board. Can you post a close up photo of the ROM board, so I can read the ROM part numbers. One of those ROMs will be ADFS 1.3...
by hoglet
Sat Sep 14, 2019 8:50 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

You definitely need to leave the Watford Electronics DDB3 Card in place. This contains the 1770 disc controller used by both Watford DDFS and Acorn ADFS. Without this there is no way the disk interface will function. Remove the ADFS and Turbo MMC ROMS. Insert a blank floppy disk into drive 0 and do:...
by hoglet
Sat Sep 14, 2019 6:51 am
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

Please feel free to send ideas for testing Can you tell us what version of Watford DDFS you have? Use *HELP for this. The Watford DDB3 board requires version 1.54T or later I believe. It's also compatible with the Acorn 1770 DFS, which is more standard. What error do you get when you *CAT a disk? H...
by hoglet
Sat Sep 14, 2019 6:41 am
Forum: hardware
Topic: MMFS SD Card on the BBC B Printer Port?
Replies: 29
Views: 680

Re: MMFS SD Card on the BBC B Printer Port?

Glad everything is now working well, that's for reporting back to us.

Dave
by hoglet
Sat Sep 14, 2019 6:36 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1159
Views: 117510

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

Sorry if this is a daft question but I'm having issues getting Pi Zero W to work with the newest PiTubeDirect EggEater 23rd December 2018 Release. It should without needing to make any config changes at all. The Pi One, Pi Zero and Pi Zero W all use the same Broadcom SoC and so are able to share th...
by hoglet
Fri Sep 13, 2019 9:06 pm
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 240

Re: Epson SD-521 DD errors/fail

Colday wrote:
Fri Sep 13, 2019 8:46 pm
I've popped a few pics on the above discord link.
The account creation step will, I think, put many people off.

I think you'll get more of a response if you posted photos locally here.

Also, they will still be viewable in 5 years time, so the thread will still make sense.

Dave
by hoglet
Fri Sep 13, 2019 12:59 pm
Forum: emulators
Topic: b-em PDP11 tube processor
Replies: 7
Views: 204

Re: b-em PDP11 tube processor

So a question for hoglet mainly, is there a standard interface here between a core and the rest of PiTubeDirect? There is, but it's at a much higher level: extern void copro_pdp11_emulator(); i.e. the wrapper class for each Co Pro is really the implementation of the standard one method API. In PiTu...
by hoglet
Thu Sep 12, 2019 9:06 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 253
Views: 10530

Re: Atom 2k18 ?

Retrogadgets wrote:
Thu Sep 12, 2019 8:57 pm
3 interested partis at the moment
Initial costs for 5 boards £14.51 plus £7.00 shipping to UK. Roughly £4.45 each Inc shipping.
Do you realize it's a 4-layer board?

I would expect the total price to be more like £40-£50 (+Shipping +Duty +VAT)

Dave
by hoglet
Wed Sep 11, 2019 1:10 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 253
Views: 10530

Re: Atom 2k18 ?

I will first try your bitstream and if the problem does not disappear I will remove that capacitor too. As I said, I don't think C24 is the problem, as I've temporarily tried fitting it and still cannot reproduce the bug. It's still best to remove C24, as it's quite a big load for the FPGA to disch...
by hoglet
Wed Sep 11, 2019 10:35 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 253
Views: 10530

Re: Atom 2k18 ?

Roland, Continuing the reset discussion from here: https://stardot.org.uk/forums/viewtopic.php?p=247588#p247588 (as it's Atom FPGA 2K18 specific) I've rebuild the design Atom FPGA 2K18 with the latest commits (that last change was your work on adding Interrupts to the UART). I've reprogrammed my FPG...
by hoglet
Tue Sep 10, 2019 9:46 pm
Forum: acorn atom and system
Topic: Atom GODIL VGA Adapter
Replies: 424
Views: 39244

Re: Atom GODIL VGA Adapter

This is all very wierd, as I see none of these problems. Roland, can you upload the actual .bit file (or .mcs) file that you currently have programmed into the FPGA? I'll then test that tomorrow and see if I can replicate the problem. (I'm not 100% sure I have the version that includes the interrupt...
by hoglet
Tue Sep 10, 2019 5:58 am
Forum: emulators
Topic: MAME: Click (and other large ROMs)
Replies: 93
Views: 5093

Re: MAME: Click (and other large ROMs)

Excellent detecive work there.... well done!
by hoglet
Tue Sep 10, 2019 5:50 am
Forum: acorn atom and system
Topic: Atom GODIL VGA Adapter
Replies: 424
Views: 39244

Re: Atom GODIL VGA Adapter

This evening when I was working with redefining characters (which works great!) I got the alternative charset after a break again. I looked at ?#BDE0 and before and after the break it was #00. That's interesting, it does sound like there is a reset bug. Are you using the Atom keyboard? Whar happens...
by hoglet
Mon Sep 09, 2019 7:17 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

Hi Paul, Thanks for posting that screen shot. Here's a quick disassembly of the updated reset code, which is quite interesting (and a clever optimization). FF3F AD FF 9F LDA $9FFF FF42 29 4F AND #$4F FF44 8D FF 9F STA $9FFF FF47 8D FF BF STA $BFFF FF4A AD 01 B0 LDA $B001 FF4D 10 03 BPL $FF52 FF4F 6C...
by hoglet
Mon Sep 09, 2019 11:06 am
Forum: hardware
Topic: Cheap Xilinx LX9 Starter Board
Replies: 30
Views: 4017

Re: Cheap Xilinx LX9 Starter Board

Instead of using a Schottky diode to transform the 5V from the "Host" system into 3V3 would a voltage regulator add any benefit ? That's not what the Sckottky diode is doing. The FPGA board already contains a 3.3V regulator (fed from several places, including directly from the VIN power pins on the...
by hoglet
Mon Sep 09, 2019 10:48 am
Forum: hardware
Topic: Cheap Xilinx LX9 Starter Board
Replies: 30
Views: 4017

Re: Cheap Xilinx LX9 Starter Board

bprosman wrote:
Mon Sep 09, 2019 10:45 am
In that case the BSS138 solution would have the same issue ?
Yes, all bidirectional FET based level shifters will have this issue.

Dave
by hoglet
Mon Sep 09, 2019 10:42 am
Forum: hardware
Topic: Cheap Xilinx LX9 Starter Board
Replies: 30
Views: 4017

Re: Cheap Xilinx LX9 Starter Board

@David - Hoglet But weren't the resistors the parts that caused issues ? (like in the MPF-1?) What I understood from our previous discussions is that you choose the 74 series because they were more "hand solder-able", or did you have other reasons to do ? Fully agree that they are a lot easier to s...
by hoglet
Mon Sep 09, 2019 9:49 am
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

Could you run the following program, and take a clear photo?

Code: Select all

10 PRINT $12
20 FOR X=#FF10 TO #FFFF
30 A=?X
40 LINK #F802
50 NEXT
60 END
We can then see whether there are other OS ROM modifications.

Dave
by hoglet
Mon Sep 09, 2019 9:43 am
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

However, this is a remarkable situation because you have an original ROM so that is not modified. My best guess is that the extras on the 74LS138 disable that ROM and enable an eprom on one of the memory boards. If you look carefully at IC24 you'll see it has a "F" on it, which is a bug clue. It al...
by hoglet
Mon Sep 09, 2019 9:36 am
Forum: acorn atom and system
Topic: Atom GODIL VGA Adapter
Replies: 424
Views: 39244

Re: Atom GODIL VGA Adapter

Mine seems to default to whatever the outside whether temperature is .... sometimes is original and sometimes it's alternative. Same goes for the mouse pointer. Sometimes I have a mouse pointer in the Atom Software Archive menu. Unfortunately that does not respond to any mouse clicks, that would be...
by hoglet
Mon Sep 09, 2019 8:20 am
Forum: acorn atom and system
Topic: Atom GODIL VGA Adapter
Replies: 424
Views: 39244

Re: Atom GODIL VGA Adapter

Hi Roland, I was wondering how I can redefine a character in the OSWRCH80 mode, is there any demo or test program? I tried poking data into #BDF0 - #BDFB and BDE1 but the characters are not changing :( Here's a small test program to try: VGA80 ?#BDE0=?#BDE0 & #F7; REM select alternative character se...
by hoglet
Sun Sep 08, 2019 8:31 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

I think at the very least you should try to trace/document the obvious modifications to the address decoding around !C23.

It's not a modificiation I've ever seen before.

Dave
by hoglet
Sun Sep 08, 2019 8:06 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

IC23, which does the ROM select decoding, looks like it's been modified significantly.

I'd try to understand what's that's trying to achieve.

Any chance of a close up photo of that area?

Dave
by hoglet
Sun Sep 08, 2019 7:51 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 491

Re: Faulty Atom

Paul,

Can you post a decent resolution photo of the current configuration you are testing.

Dave