Search found 621 matches

by IanS
Sat Aug 11, 2018 9:51 pm
Forum: hardware
Topic: Quick measurement
Replies: 28
Views: 385

Re: Quick measurement

Do you have some reason to believe it won't be ~10K
io.PNG
io.PNG (37.42 KiB) Viewed 353 times
by IanS
Fri Aug 10, 2018 10:59 pm
Forum: general
Topic: Today I received.....
Replies: 4743
Views: 321142

Re: Today I received.....

Nice work! This is the latest version of your own design, I take it? Just a small evolution, 374 buffers replaced with 574's to make the layout easier. Swapped the 245's around so I can use R/W signal from podule bus rather than having to invert it, saving a GAL pin. Clock pins for the latches are ...
by IanS
Fri Aug 10, 2018 9:34 pm
Forum: general
Topic: Today I received.....
Replies: 4743
Views: 321142

Re: Today I received.....

Smaller (partial) surface mount 8-bit IDE podule. IMG_20180810_220808.jpg It fits vertically in an A30x0. IMG_20180810_220541_HDR.jpg Only one short that stopped it working first time, it was on the first resistor pack I fitted. (I still need to seriously improve my surface mount soldering skills. N...
by IanS
Sun Aug 05, 2018 11:13 am
Forum: hardware
Topic: A3020 stopped booting from IDE
Replies: 5
Views: 113

Re: A3020 stopped booting from IDE

trixster wrote:
Sun Aug 05, 2018 10:55 am
Sorry, my mistake, I meant holding down ctrl when switching the machine on!
I'm still not sure what you think that should do.
Holding "delete" at power-on is the usual cmos reset.
http://www.riscos.com/support/developer ... types.html
by IanS
Sun Aug 05, 2018 10:29 am
Forum: hardware
Topic: A3020 stopped booting from IDE
Replies: 5
Views: 113

Re: A3020 stopped booting from IDE

What do you think ctrl-escape should do, not something I was aware of.

What does the output of *STATUS show.

Sounds like you need to *CONFIGURE DRIVE 4
(And possibly *CONFIGURE BOOT)

Check the output of *STATUS after changing these and a reboot to check the values are veing saved.
by IanS
Wed Aug 01, 2018 7:58 pm
Forum: hardware
Topic: Amstrad Gt64/65 Monitors
Replies: 12
Views: 280

Re: Amstrad Gt64/65 Monitors

I seem to recall that the composite out of the bbc could be fed to both the luminance and sync pins to get a picture on these or am I wrong? It works, but it's not great. Not a lot of adjustment, the pictures is with the lowest brightness set on the monitor. It's difficult to get a black background...
by IanS
Tue Jul 31, 2018 11:05 pm
Forum: upcoming and recent events & exhibitions
Topic: Midlands ABUG November 2018
Replies: 32
Views: 1648

Re: Midlands ABUG November 2018

z0m8ied0g wrote:
Tue Jul 31, 2018 10:24 pm
What's happening with this is it going ahead?
Probably better asking on Facebook, Alex doesn't seem to frequent *. very often these days.
by IanS
Tue Jul 31, 2018 10:49 am
Forum: hardware
Topic: That A4 Laptop on ebay?
Replies: 3
Views: 268

Re: That A4 Laptop on ebay?

goto ebay.co.uk
search for "Acorn A4"
show "completed items" only.
https://www.ebay.co.uk/itm/-/192603819483?nordt=true

£560
by IanS
Mon Jul 30, 2018 9:40 pm
Forum: hardware
Topic: Amstrad Gt64/65 Monitors
Replies: 12
Views: 280

Re: Amstrad Gt64/65 Monitors

dominicbeesley wrote:
Mon Jul 30, 2018 9:36 pm
I seem to recall that the composite out of the bbc could be fed to both the luminance and sync pins to get a picture on these or am I wrong?
Sounds possible, at least the composite signal will be about the right voltage level for the GT64, so no resistors required.
by IanS
Mon Jul 30, 2018 9:04 pm
Forum: acorn atom
Topic: Econet Card on Ebay
Replies: 13
Views: 401

Re: Econet Card on Ebay

IC49
is49.PNG
is49.PNG (136.6 KiB) Viewed 208 times
by IanS
Mon Jul 30, 2018 8:58 pm
Forum: hardware
Topic: Amstrad Gt64/65 Monitors
Replies: 12
Views: 280

Re: Amstrad Gt64/65 Monitors

The GT64/5 only uses two signals from the CPC, pin 4 is sync, pin 6 is luminance. Pin 6 on a beeb is 5V. I've not tried it, but you can probably connect a beeb to a GT64 with a small adapter cable. The video signals (RGB) from the beeb are TTL level, so will need some resistors in-line to connect to...
by IanS
Mon Jul 23, 2018 9:01 pm
Forum: general
Topic: *TAPE baud rates
Replies: 24
Views: 493

Re: *TAPE baud rates

AndyF wrote:
Mon Jul 23, 2018 8:38 pm
My memory might be playing tricks on me then but I could of sworn that the media gap in the case and the track 'hole' were not shuttered.
https://www.youtube.com/watch?v=K7Xlx5qRszU
by IanS
Mon Jul 23, 2018 8:28 pm
Forum: general
Topic: *TAPE baud rates
Replies: 24
Views: 493

Re: *TAPE baud rates

Mind you despite the low capacity of the 3" units their cases were quite hardy, shame there was no protection shutter on the media 'hole' though! All the 3" discs I own have a shutter. http://www.obsoletemedia.org/3-inch-compact-floppy-disk/ The 3-inch floppy has a more rigid casing than a 3.5-inch...
by IanS
Mon Jul 16, 2018 10:10 pm
Forum: hardware
Topic: A3000 - IDE podule
Replies: 16
Views: 1297

Re: A3000 - IDE podule

... Acorn A300/A400 IDE Interface (External) (c) Hard- & Softwarevertrieb 1990 (drawing dated 7-2-91) <- I think this was a collaboration with a German chap called Peter Szymanski (I have his address in Meinerzhagen), however, I'm not sure of the reasons we didn't go with his design. I found an IDE...
by IanS
Fri Jul 13, 2018 8:17 pm
Forum: software
Topic: Networking: how to setup TCP/IP for an Oak Solutions ClassNet podule?
Replies: 11
Views: 460

Re: Networking: how to setup TCP/IP for an Oak Solutions ClassNet podule?

I suspect you need to add an AutoSense file. https://www.4corn.co.uk/archive//acornftp/riscos/releases/UniBoot/!Boot/Resources/Configure/!InetSetup/%21Help Look in the "Technical details" section. It's been a long time since I've needed to do this, but an example file/program is in the RPCEmu setup,...
by IanS
Sun Jul 08, 2018 8:54 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 44
Views: 1746

Re: IDE interfaces - hardware details

Well done tracking that down. Good to know it's now working.
by IanS
Sun Jul 08, 2018 5:01 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 44
Views: 1746

Re: IDE interfaces - hardware details

Does the output of the DeviceID program look sensible (does it match the size of the device you are using?) With zidefsdrive 1 and zidefsdiscs 1 and zidefsdrive 4, when you run the partion program it should allow you to set the size of the partition. Then reboot the machine (prefreably a power-cycle...
by IanS
Sun Jul 08, 2018 4:43 pm
Forum: acorn atom
Topic: new to atom: ram rom mmc joystick power
Replies: 23
Views: 553

Re: new to atom: ram rom mmc joystick

oss003 wrote:
Sun Jul 08, 2018 3:09 pm
I set all bits to input
Can you configure a couple of pins as outputs? So you you could use two outputs as column outputs and have a 2x6 matrix of switches for up/down/left/right/fire1/fire2 for 2 players. Probably need some diodes to avoid gosting effects.
by IanS
Sun Jul 08, 2018 4:39 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 44
Views: 1746

Re: IDE interfaces - hardware details

Which version of hform are you using? All my formatting on RISC OS 3.11 has been using version 2.19 (24 Apr 92). It's the version that is on Apps disc 2 - http://www.riscos.com/ftp_space/310/index.htm You will only be able to partition it up to 512MB per partition (499MB is a better choice). The tra...
by IanS
Sun Jul 08, 2018 3:53 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 44
Views: 1746

Re: IDE interfaces - hardware details

if i format with raspberry a microSD card, then i partition it with zidefs tool, then i got harddisc0 and i can use it perfectly... since a reset or power cycle. That sounds the wrong way round. You should partition the disk, then format (only need to initialise them) with !hform. It can all be don...
by IanS
Sat Jul 07, 2018 4:28 pm
Forum: hardware
Topic: A3000 restoration
Replies: 7
Views: 467

Re: A3000 restoration

That is RISC OS 2.

I think you need to change more than just LK20, check page 28 - http://chrisacorns.computinghistory.org ... ctions.pdf

The floppy can be useful, as it may blink an error code if some other problem is found.
by IanS
Sat Jul 07, 2018 2:42 pm
Forum: hardware
Topic: Olivetti Prodest 128S keyboard issue
Replies: 16
Views: 295

Re: Olivetti Prodest 128S keyboard issue

Are you looking at the right key, the "/" key in your original keyboard matrix picture, is the one on the numeric keypad, so will probably be on the other side of the blue link. The "/?" key is on R1 and C8.
by IanS
Sat Jul 07, 2018 2:10 pm
Forum: hardware
Topic: Olivetti Prodest 128S keyboard issue
Replies: 16
Views: 295

Re: Olivetti Prodest 128S keyboard issue

The last solder connection in your diagram is a link, have you followed the track the other side,
kbd.PNG
kbd.PNG (159.06 KiB) Viewed 167 times
(Link shown in blue)
by IanS
Fri Jul 06, 2018 12:35 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 44
Views: 1746

Re: IDE interfaces - hardware details

alienkidmj12 wrote:
Fri Jul 06, 2018 12:21 pm
Do these work on a3000, and support biggish hds ?
Both would work on an A3000 (the only machine with an 8-bit internal podule slot and an external 16-bit podule connector)

On a RISC OS 3.11 machine (e.g. A3000) they support up to 2GB of space (4 partitions of 512MB each)
by IanS
Wed Jul 04, 2018 12:07 pm
Forum: hardware
Topic: EUPURS and AP5 Cable(s)
Replies: 59
Views: 824

Re: EUPURS and AP5 Cable(s)

As discussed before (but I still haven't tried it), if you want to stick to TTL levels and avoid the RS-232 voltages and the UPURS clamping components, you will probably need to invert the signals from the serial adapter - viewtopic.php?f=3&t=10586&p=136573#p136534
by IanS
Sat Jun 30, 2018 5:02 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 74
Views: 6303

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!

If you have misspelled card identification, you probably still have some broken/shorted tracks.
by IanS
Thu Jun 28, 2018 10:21 pm
Forum: hardware
Topic: Interesting video device
Replies: 2
Views: 210

Re: Interesting video device

Was that on hackaday, I'm sure I saw an article using a similar chip today.

Looks like the video generator is only configurable over SPI, or did I read the datasheet wrong?
by IanS
Sat Jun 23, 2018 2:28 pm
Forum: software: other
Topic: Any short type-ins for unattended Beebs?
Replies: 102
Views: 4701

Re: Any short type-ins for unattended Beebs?

Line 130 & 140 should be "5-45" not "5.45"
by IanS
Fri Jun 22, 2018 6:30 pm
Forum: upcoming and recent events & exhibitions
Topic: RCM 10th Anniversary party tomorrow
Replies: 4
Views: 183

Re: RCM 10th Anniversary party tomorrow

I was hoping to go, but the list filled up before I got round to mailing them.