Search found 536 matches

by dominicbeesley
Thu Nov 16, 2017 11:35 am
Forum: hardware
Topic: read / write to JIM
Replies: 36
Views: 1419

Re: read / write to JIM

I guess not then! Is there anyone out there who has expansion RAM in JIM? If I knock up some tools would there be interest, any help with testing? Also, is there an official way to work out what expansion RAM is fitted if any? I'll probably just make them work blind for now... I'm thinking: JLOAD <f...
by dominicbeesley
Thu Nov 16, 2017 12:09 am
Forum: hardware
Topic: read / write to JIM
Replies: 36
Views: 1419

read / write to JIM

Before I start coding...

I'm currently working on device that exposes memory in the JIM (page &FD) are and uses the page wide paging registers. Are there any standard tools for reading / writing files to / from JIM?

D
by dominicbeesley
Thu Nov 09, 2017 12:00 pm
Forum: hardware
Topic: Would anyone mind burning me a Starstick ROM?
Replies: 12
Views: 628

Re: Would anyone mind burning me a Starstick ROM?

Has it broken the machine or just that ROM? Which ROM slot(s) did you try them in? When I tried them they were in a ZIF socket so it may just need the pins given a scrape with a pen knife to shine the IC pins up the sockets can be more difficult to clean without stressing the spring contacts. I know...
by dominicbeesley
Tue Nov 07, 2017 8:58 am
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1650

Re: Unix on the Beeb

Nice one Rob, I had a go at getting ucLinux to boot a few years ago on the Sprow ARM copro, it worked ok! I can't remember now how I had it set up in terms of discs, I suspect it ran from RAM disc... I then went down the rabbit hole of adding a Flash ROM to the board and trying to get that to hold t...
by dominicbeesley
Sun Nov 05, 2017 5:37 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Thanks Graham,

I'll look around at the Vectrex forum, I will also see if I can track down any active Coco programmers at some point.

I'm sure Any stories you, or JGH have would be received with interest!

D
by dominicbeesley
Thu Nov 02, 2017 11:30 am
Forum: hardware
Topic: Daisy-chaining 2 FDD
Replies: 7
Views: 303

Re: Daisy-chaining 2 FDD

I usually just pop the connector off and untwist, reset in a vice, (or other suitable press - I used an ikea cupboard door the other day, not recommended but it worked, unlike the door afterwards).... This one looks to be untwisted http://www.ebay.co.uk/itm/Fast-Flexible-Cool-DUAL-FLOPPY-DRIVE-RIBBO...
by dominicbeesley
Wed Nov 01, 2017 2:34 pm
Forum: hardware
Topic: Would anyone mind burning me a Starstick ROM?
Replies: 12
Views: 628

Re: Would anyone mind burning me a Starstick ROM?

Hi commie_user, I've sent you a PM
by dominicbeesley
Tue Oct 31, 2017 7:45 pm
Forum: hardware
Topic: Test ROM
Replies: 15
Views: 559

Re: Test ROM

The ROM that Graham posted up doesn't do anything that spectacular, are you talking about the same thing?

D
by dominicbeesley
Tue Oct 31, 2017 4:44 pm
Forum: hardware
Topic: Test ROM
Replies: 15
Views: 559

Re: Test ROM

Files are attached.

I can't recall the exact details but I remember ending up with something like that when I broke the nmi pin on the wd1770 upgrade and noise would cause random NMIs...

You can read ssds using the tools here: https://swhs.home.xs4all.nl/bbc/mmbeeb/windows.html

D
by dominicbeesley
Tue Oct 31, 2017 2:35 pm
Forum: hardware
Topic: Test ROM
Replies: 15
Views: 559

Re: Test ROM

Do you want a physical ROM blowing or just the binary extracting from the SSD?

Either way post up the SSD and PM me your address if you want me to blow and EEPROM for you...

D
by dominicbeesley
Tue Oct 31, 2017 2:33 pm
Forum: hardware
Topic: Master 128 PSU schematic
Replies: 8
Views: 755

Re: Master 128 PSU schematic

Thanks Ottly, Mark, I finally dug out some 3W resistors and replaced R2, R3, it now starts up instantly again. One (I can't remember which but I think R2) had gone to 275K from 180K. All the electrolytics tested fine for both ESR and leakage, though I'd already removed the main smoothers before I te...
by dominicbeesley
Tue Oct 31, 2017 2:27 pm
Forum: hardware
Topic: part list bbc psu ?
Replies: 19
Views: 1800

Re: part list bbc psu ?

For completeness - on the master PSU I just repaired R2, R3 are both 180k rather than 100k
by dominicbeesley
Thu Oct 26, 2017 1:56 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Straying slightly OT into VHDL, I'm trying to model the Mk.2 board before I commit to fabrication. I've swapped over to using TI 74CB3T6211 bidirectional level shifters instead of 74XX4245s. I'm not clear how to model them in VHDL. The naive 1st cut (delays not implemented yet) seems to work but I'm...
by dominicbeesley
Tue Oct 24, 2017 11:08 am
Forum: hardware
Topic: high density disks
Replies: 162
Views: 23759

Re: high density disks

Thanks for the info Martin, I will have a play with this. I was hoping it wouldn't require modding the drive, it's a shame that they didn't multiplex pin 2 i.e. only pull it low/high when that particular drive is selected... I need to go on a mining expedition in my storage unit to find my store of ...
by dominicbeesley
Mon Oct 23, 2017 2:26 pm
Forum: hardware
Topic: high density disks
Replies: 162
Views: 23759

Re: high density disks

I've been reading this thread with interest and I'm going to have a play at some point. I have a question about pins 4 and 2 on the floppy cable. Was there consensus that this was used consistently on 3.5" drives as an output? For 5.25" HD this is an output, does it switch both connected d...
by dominicbeesley
Fri Oct 20, 2017 11:24 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Thanks Rob, I ended up writing a quick script that builds a Flex binary, which proved to be quite simple. I've got it sort of working - no Escape detection yet or LOAD/SAVE/CHAIN. I've sent you and email with the source code - let me know if it doesn't come through - it may get blocked as it's quite...
by dominicbeesley
Fri Oct 20, 2017 4:35 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

I've made start, let me know if you'd like the code so far. The whole Flex thing is a bit of a mystery but I think I'm getting there. I now have something that should at least get to a prompt and allow entry of code but I'm not sure how to load an intel hex file into Flex...I suspect easiest will be...
by dominicbeesley
Fri Oct 20, 2017 12:13 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Aha, I was looking for just this pdf! I new there was something somewhere that details .BIN format! I've just spent the last hour looking and it does look like it should be fairly easy to port, I've started a branch of it now. And will have a quick go at hacking something together. I'd got myself co...
by dominicbeesley
Fri Oct 20, 2017 11:18 am
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

It's up to you, I've got plenty on my plate I was just going to have a desultory play with it over the weekend. I suspect that it will require some major surgery to make it play nice i.e. it expect a fixed string buffer at &600 and variables at &400. I'll have a quick look at this today to s...
by dominicbeesley
Fri Oct 20, 2017 10:34 am
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Thanks Rob, That looks like it should work "out of the box" on my hardware, once I've sorted out a linear memory map, and OSWORD 7F...I was hoping to have the mk.2 hardware laid out by August, looking more like after Christmas at this rate... I'll have a punt at BBCBasic in the near future...
by dominicbeesley
Wed Oct 18, 2017 10:45 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Thanks Rob, I've found some of it - sorry for the confusion, my memory is not what it was! I'll have a look at the code later in the week. I'm not sure I've got it all: - adaptation guide - floppymaint - flex_srces.dsk Are your routines on that .dsk image - I had a poke through them earlier and coul...
by dominicbeesley
Wed Oct 18, 2017 10:36 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Thanks Dave, I wouldn't expect you to do any porting. I'll have a look when it all comes - I have a plan for an add on for the BBC that would plug into the CPU socket and this might be the way to do it, or at least to test the principle. I was thinking of the DE0 just for the on-board memory but I c...
by dominicbeesley
Wed Oct 18, 2017 3:41 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Thanks Dave, I've ordered that spartan board, I couldn't find much documentation about how the level shifter board works or how to map the pins onto that Spartan Board....no doubt I'll be back with questions when the parts arrive.... Is there something Xilinx specific or would it just be the usual f...
by dominicbeesley
Wed Oct 18, 2017 1:42 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Or could it be made to work with this one at a push?

https://shop.trenz-electronic.de/en/TE0 ... odule?c=97

D
by dominicbeesley
Wed Oct 18, 2017 1:33 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Thanks Dave,

I've ordered a level shifter, I already have a DE0 nano,will that work?

D
by dominicbeesley
Wed Oct 18, 2017 1:20 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Sorry Rob, I think you did send them. I'll fire up my old PC tonight and have a look. :oops:

D
by dominicbeesley
Wed Oct 18, 2017 12:28 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8844

Re: 6809 experiments

Not quite, I've used different hardware addresses for many things and some things such as the Video ULA and memory controller which does the swapping in / out of ROMs. Also, whilst BBC BASIC is 6809 friendly the MOS ROM I've written expects a 6309 rather than a 6809. However, it should be easy enoug...
by dominicbeesley
Wed Oct 18, 2017 12:13 pm
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Thanks Rob, you're a star. That works! I'll have a quick go at getting BBC Basic on there, no idea yet how I create a flex format SSD!?? Is there a way to run *import from within flex or do I have to run MON to drop back to the supervisor prompt....lots of questions... Which version of Flex is this ...
by dominicbeesley
Wed Oct 18, 2017 11:33 am
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Similar, it just hangs, if it's not obvious I'll try and dig out the debugger later and see where its getting stuck... What version of Flex is it based on and do you have the source for the beeb specific drivers - it would help to see where it's getting stuck. From the noise from the speaker it soun...
by dominicbeesley
Wed Oct 18, 2017 10:53 am
Forum: software: other
Topic: 6809 and FLEX
Replies: 142
Views: 9588

Re: 6809 and FLEX

Thanks Rob, I just gave it a quick go here on a Master 128 with Matchbox Copied BBCFLEX_DC.DSD to stick *IMPORT -02 BBCFLE~1.DSD Shift-Break - it just hangs with an odd low level whir from speaker I also tried soft-loading the latest 6809-client (1.05) and doing *RUN !BOOT but get the same results A...