Search found 4707 matches

by exxos
Thu Sep 27, 2018 4:47 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 85
Views: 3950

Re: ALPHA MODIFICATIONS

Forgottenmyname wrote:
Thu Sep 27, 2018 4:22 pm
If you've kept up, your board should now look a little something like this :)
*real* computing this is :thumbup:
by exxos
Thu Sep 27, 2018 4:23 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 667
Views: 17155

Re: Icky - Progress

It might be worth scoping out some pins around ACIA area, such as (U54) A1 pin 11, A2 pin 8, (U32) pin 3 SNDCS.. (IC2 MFP) pin 48 CS. Back to the plot... My thoughts here are the chip select lines having noise on them causing the ACIA,YM etc not to be selected properly.. It is only a theory. Though...
by exxos
Thu Sep 27, 2018 2:01 pm
Forum: STF REMAKE PROJECT
Topic: Video connector un-f*ck
Replies: 22
Views: 891

Re: Video connector un-f*ck

DHL just brought these... nv.jpg If any UK/EU people want one please let me know in a PM.. but please, everywhere else in the world (USA, OZ etc) order the PCB from OSH if you want one, it will be cheaper and quicker than me sending them to you ( I only have 8 PCBs, oddly the price shot up drastical...
by exxos
Thu Sep 27, 2018 12:19 pm
Forum: STE V2 BOOSTER
Topic: STE V2 BOOSTER + SRAM STATUS
Replies: 25
Views: 3884

Re: STE V2 BOOSTER + SRAM STATUS

Are these still in development? Nope. I'm only developing the SEC booster now... https://www.exxoshost.co.uk/forum/viewtopic.php?f=7&t=45&start=110#p4314 I am not really doing STFM upgrades as such, its more a prototype for the STF remake boards than a STFM upgrade.. But likely can be used on both ...
by exxos
Thu Sep 27, 2018 12:14 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 667
Views: 17155

Re: Icky - Progress

The Floppy Disk Interface can be divided into three sections: Motor Control, Write Signals and Read Signals. All of these lines are capable of driving one TTL load and not compatible for direct connection to the drive. Most drives require an open-collector TTL interface with high current drive capa...
by exxos
Thu Sep 27, 2018 11:20 am
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 667
Views: 17155

Re: Icky - Progress

:threadjacked: I took apart a external drive.. and measured the LS06 pins on the connector.. all read the same value (tried both ways with meter probes) Looks like some bodge on resistors internally.. can't get PCB out to check further :( IMG_3277.JPG IMG_3279.JPG EDIT: Similar thing on the original...
by exxos
Thu Sep 27, 2018 10:49 am
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 85
Views: 3950

Re: ALPHA MODIFICATIONS

Forgottenmyname wrote:
Thu Sep 27, 2018 10:19 am
Does it need to 1k? I'm running short on those by the looks.
No idea. I suggested 10K to Icky.. I guess almost anything would work, even 100K maybe .
by exxos
Thu Sep 27, 2018 10:48 am
Forum: BENCHMARKS
Topic: STF Remake Benchmarks
Replies: 13
Views: 1121

Re: STF Remake Benchmarks

Forgottenmyname wrote:
Thu Sep 27, 2018 10:15 am
I do have some 32.0245 mhz crystals at home. Could wire one and see later once I did my floppy?
Go for it :)
by exxos
Thu Sep 27, 2018 10:38 am
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 667
Views: 17155

Re: Icky - Progress

I found this diagram... https://www.atarimax.com/jindroush.atari.org/data/ahard/sch_xf551.gif sch_xf551.gif Key part... is the LS 14 (schmitt buffer) not open collector. Seems "everyone" uses open collector (LS06) but why ? There must be some other machines out there like the BBC which use the 1772 ...
by exxos
Thu Sep 27, 2018 10:24 am
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 667
Views: 17155

Re: Icky - Progress

Forgottenmyname wrote:
Thu Sep 27, 2018 10:12 am
More interesting than coronation street. :D
Indeed!
Forgottenmyname wrote:
Thu Sep 27, 2018 10:12 am
Will try the pull ups and hopefully scope the audio tonight myself.
:bravo:

It might be worth scoping out some pins around ACIA area, such as (U54) A1 pin 11, A2 pin 8, (U32) pin 3 SNDCS.. (IC2 MFP) pin 48 CS.