Search found 343 matches

by marcusjambler
Mon Jun 25, 2018 8:17 am
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

The dead bits show up as vertical lines in the diagonal sequence. Put it in 16k mode ( S25 ) south. This will let you see the upper 16k block. Run Tricky's test OS ROM.... Let it cycle through.. Take some quality close up photos of the right hand side of the screen, when the diagonal test is running...
by marcusjambler
Sat Jun 23, 2018 9:09 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

If the Mode 7 screen is corrupt then it could be IC5 SAA5050 Teletext Character Generator causing issues.
by marcusjambler
Sat Jun 23, 2018 12:40 pm
Forum: projects
Topic: BeebSCUMM
Replies: 18
Views: 532

Re: BeebSCUMM

Looking like this will be epic Sarah =D> =D> =D>
by marcusjambler
Tue Jun 19, 2018 10:38 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

How about testing the programmer by burning a copy of BASIC and seeing if it boots on the working beeb
by marcusjambler
Tue Jun 19, 2018 10:22 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 54
Views: 1483

Re: BBC Micro Compendium by Jeremy Ruston

BASIC on Z88
IMG_4031a.jpg
by marcusjambler
Tue Jun 19, 2018 9:44 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 54
Views: 1483

Re: BBC Micro Compendium by Jeremy Ruston

Did anyone find a copy/scan of the Compendium anywhere
Er.... I bought a copy on Amazon last week :shock:
by marcusjambler
Tue Jun 19, 2018 7:18 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

I only get the vertical bars on both the working and faulty systems
That is strange because if the ROM is working correctly you would see it operate correctly on a working system.
You can test the image in Beebem to see the correct sequence.
by marcusjambler
Tue Jun 19, 2018 6:56 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

now I do get the first screen on the Test ROM output Is that a screen with mode 7 ( teletext ) style graphics? If you let the ROM go through its sequence... You should see several pages of vertical and then diagonal lines slowly progressing left to right. If you post photos of those screens we shou...
by marcusjambler
Tue Jun 19, 2018 1:29 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

test the Test ROM in a known working machine
=D>
Great idea
by marcusjambler
Tue Jun 19, 2018 1:17 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 67
Views: 989

Re: (Yet another) Memory Question

Looks to me like there is a major issue...
The first screen, if the CPU is running, is a mode 7 Frogger screen with some audio and front LED pulsing.
So theres either something off with the clock or the CPU...
I'd go for swapping the CPU for a known good one and try the test ROM again.
by marcusjambler
Mon Jun 18, 2018 4:57 pm
Forum: general
Topic: Today I received.....
Replies: 4659
Views: 313063

Re: Today I received.....

A few hidden gems in a cheap Beeb off tinterweb
IMG_4028a.jpg
IMG_4025a.jpg
IMG_4026a.jpg
IMG_4027a.jpg
by marcusjambler
Fri Jun 15, 2018 12:46 pm
Forum: hardware
Topic: Multi-purpose podule with a Raspberry Pi
Replies: 8
Views: 238

Re: Multi-purpose podule with a Raspberry Pi

the PiPOD falls into the "completely pointless" category for me. It's essentially the equivalent of buying a sports car and then supergluing it to the inside of a truck.

That is the impression I had also :lol:

Thanks for the explanation phlamethrower.
by marcusjambler
Fri Jun 15, 2018 12:15 pm
Forum: hardware
Topic: Multi-purpose podule with a Raspberry Pi
Replies: 8
Views: 238

Re: Multi-purpose podule with a Raspberry Pi

Can someone please clear up what the difference is between this project and the RPI module available on ebay from time to time [-o<

https://www.ebay.co.uk/itm/PiPOD-Ultra- ... Sw44BYIksn
by marcusjambler
Wed Jun 13, 2018 7:49 am
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 891

Re: 640x512 50 fps Bad Apple on a B... how?!

=D> seriously impressive =D>
by marcusjambler
Fri Jun 08, 2018 5:24 pm
Forum: hardware
Topic: Cassette player maintenance
Replies: 14
Views: 241

Re: Cassette player maintenance

measure with a piece of string and then deduct 10%
Yeah... Thinking about it that does sound more appropriate, given the difference in elasticity
by marcusjambler
Fri Jun 08, 2018 2:32 pm
Forum: hardware
Topic: Cassette player maintenance
Replies: 14
Views: 241

Re: Cassette player maintenance

I have a cassette recorder which has the drive belt for the counter missing.
Trial and error with rubber bands until you get it responding... If there's no manual
Then... get a drive belt roughly the length of the rubber band or maybe a little shorter... Off of a fave auction site
by marcusjambler
Fri Jun 08, 2018 1:51 pm
Forum: hardware
Topic: Cassette player maintenance
Replies: 14
Views: 241

Re: Cassette player maintenance

Hi Phil In my experience its a combination of uneven drive belt, 'sticky' rollers, tightly wound tapes and dirty heads... Sometimes you can 'free-up' drive belts and tight tapes by FF and RW a few times... ok 10 times :shock: Head cleaner tape and IPA for dirty heads obviously... IPA for sticky roll...
by marcusjambler
Wed Jun 06, 2018 4:36 pm
Forum: hardware
Topic: Early BBC Micro's (ICL)
Replies: 9
Views: 531

Re: Early BBC Micro's (ICL)

Here it is ICL 014408 .... It was a right muck tub when I got it... Scrubbed up beautifully with the WE board still working. I replaced the sockets for turned pin ones and soldered them in whilst attached to the WE board so they line up perfectly :lol: Marcus IMG_3641a.jpg IMG_3645a.jpg IMG_3649a.jpg
by marcusjambler
Wed Jun 06, 2018 3:04 pm
Forum: hardware
Topic: Early BBC Micro's (ICL)
Replies: 9
Views: 531

Re: Early BBC Micro's (ICL)

=D> I think I have one of these....
I'll have a dig around and post a picture....
by marcusjambler
Wed Jun 06, 2018 9:54 am
Forum: hardware
Topic: Gotek noob - trying to get beebug C to work on a datacentre
Replies: 49
Views: 679

Re: Gotek noob

What is it like speed wise? Is it faster than floppy
Pretty much the same as 3.5" floppy in terms of access and load speeds
by marcusjambler
Wed Jun 06, 2018 9:43 am
Forum: hardware
Topic: Gotek noob - trying to get beebug C to work on a datacentre
Replies: 49
Views: 679

Re: Gotek noob

The threads here Phil : https://stardot.org.uk/forums/viewtopic.php?f=16&t=13718&p=180082&hilit=gotek+flash#p180082 You just need to flash the £13 gotek... rotary and OLED display are optional. up/down buttons and 3x7-seg display come as standard Works a treat with 1770 SSD/DSD and ADF images Marcus
by marcusjambler
Wed Jun 06, 2018 9:29 am
Forum: emulators
Topic: MAME: Speech
Replies: 17
Views: 879

Re: MAME: Speech

by marcusjambler
Wed Jun 06, 2018 8:29 am
Forum: general
Topic: Today I received.....
Replies: 4659
Views: 313063

Re: Today I received.....

Ooh... That looks interesting....
Are there any boards knocking around?

Marcus
by marcusjambler
Wed Jun 06, 2018 7:28 am
Forum: emulators
Topic: MAME: Speech
Replies: 17
Views: 879

Re: MAME: Speech

74LS629 is the IC
by marcusjambler
Wed Jun 06, 2018 7:27 am
Forum: emulators
Topic: MAME: Speech
Replies: 17
Views: 879

Re: MAME: Speech

It looks like you set the range (RNG) and the actual frequency depends on the value of Cext and the pot.
According to Fig. 1 to 5
by marcusjambler
Tue Jun 05, 2018 5:44 pm
Forum: emulators
Topic: MAME: Speech
Replies: 17
Views: 879

Re: MAME: Speech

Rom Dump
WESPEECH.zip
(4.56 KiB) Downloaded 4 times
by marcusjambler
Tue Jun 05, 2018 5:27 pm
Forum: emulators
Topic: MAME: Speech
Replies: 17
Views: 879

Re: MAME: Speech

Photos of the PCB of WE speech unit... I'm struggling to spot a crystal
Strangely pin 28 is not connected which, according to the SPO256, data sheet should be one side of the crystal

IMG_3620a.jpg
IMG_3623a.jpg
IMG_3636a.jpg
Marcus
by marcusjambler
Tue Jun 05, 2018 3:21 pm
Forum: for sale / freebies
Topic: Having a clear out
Replies: 46
Views: 1334

Re: Having a clear out

I'll have the Elite box etc please.
I've got a lonesome disk waiting for a home :)

Marcus
by marcusjambler
Tue Jun 05, 2018 1:52 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 19
Views: 577

Re: Atom 2k18 ?

Fantastic... A new Atom to build =D>
by marcusjambler
Mon Jun 04, 2018 9:26 pm
Forum: general
Topic: Today I received.....
Replies: 4659
Views: 313063

Re: Today I received.....

Nice, could you add some details to my post at viewtopic.php?f=4&t=13937#p202436

Would like to see some photos of the board (both sides), and the value of the crystal on there, thanks.
No problem. I'll get on it in the next few days

Marcus