Search found 492 matches

by shadowmask
Sat Apr 22, 2017 8:05 pm
Forum: Yamaha reface forum
Topic: reface cp hands-on review
Replies: 45
Views: 1535

Re: reface cp hands-on review

I'm very happy to hear Dusty is still about . . . He was MASSIVELY helpful to me some years ago on the subject of FW upgrades for the SY85. This takes me back to 1994 when I bought a new TG300. There was some strange bug with the LFO where a slow Sine setting on the filter would jump from time to t...
by shadowmask
Fri Apr 21, 2017 1:06 pm
Forum: Yamaha SY99 Forum
Topic: Begging for ROMS
Replies: 129
Views: 14302

Re: Begging for ROMS

Gentlemen, awesome news, we have success! I received Brian's burn of Mik's CPU data to the HD6475328CP10 Chip, combined it with the EPROM data of Mik's that I burned & tested previously - and voila' - SY99 upgraded from 1.40 to 1.57 ! And to think I can going to toss those CPUs! So where can yo...
by shadowmask
Sun Apr 16, 2017 7:58 am
Forum: Yamaha MOXF
Topic: MOXF Hidden Test Menu
Replies: 2
Views: 77

MOXF Hidden Test Menu

Credit to Purcell for pointing out the Youtube Video :)

https://sector101synth.wordpress.com/20 ... -test-menu

Brian
by shadowmask
Sat Apr 15, 2017 5:22 pm
Forum: Yamaha SY99 Forum
Topic: Begging for ROMS
Replies: 129
Views: 14302

Re: Begging for ROMS

By looking at one of my pics (taken while 'servicing' my SY99) I just found out that my CPU is the PROM version: http://www.yamahaforums.co.uk/forum/download/file.php?id=409&mode=view See lower right corner - it's a 6475328 type CPU... More interestingly is that it is the CP10 version that I as...
by shadowmask
Sat Apr 15, 2017 7:57 am
Forum: Yamaha SY99 Forum
Topic: Begging for ROMS
Replies: 129
Views: 14302

Re: Begging for ROMS

That is the MaskROM version of the 532 where Hitachi have put the CPU code into the die during fabrication. 64 3 5328 MaskROM Version 64 7 5328 PROM Version See if you can extract the code from this. I tried with my SY85 80pin QFP CPU but failed, I don't know if I had it wired wrong or MaskROM CPUs ...
by shadowmask
Sun Mar 26, 2017 5:34 pm
Forum: Yamaha SY99 Forum
Topic: Begging for ROMS
Replies: 129
Views: 14302

Re: Begging for ROMS

Hold fire on the CP10 version. The datasheet says that (at the time of writing) 10MHz was the fastest model available.

Maximum clock rate: 10MHz (oscillator frequency: 20MHz)

The Xtal in the SY99 is 24Mhz so the later CP12 version would make sense, assuming "12" means 12Mhz.

Brian
by shadowmask
Sun Mar 26, 2017 10:10 am
Forum: Chill Out Room
Topic: Change of time ... again!
Replies: 4
Views: 105

Re: Change of time ... again!

With yesterday being the 3 hour 'first grass cut of the year' I could have done with an extra hour ;)

Brian
by shadowmask
Sun Mar 26, 2017 9:59 am
Forum: Yamaha SY99 Forum
Topic: Begging for ROMS
Replies: 129
Views: 14302

Re: Begging for ROMS

I remember trying to read the code from my TG500's CPU ROM area and it was successful. The TG500 uses the same IC as your 1.40 and 1.57 SY99 CPUs so it would be possible to get the 1.57 code out of the your CPU and use it to upgrade other SY99s. Some SY99 units may have the SMD version of the IC so ...
by shadowmask
Thu Mar 09, 2017 1:37 pm
Forum: Yamaha SY22, SY35 & SY55
Topic: SY55 Memory Card without battery lost presets
Replies: 1
Views: 65

Re: SY55 Memory Card without battery lost presets

Hi,

Sorry, no magic will recover your sounds. Once the battery was removed during the change-over all the data was lost.
by shadowmask
Sun Dec 11, 2016 1:05 pm
Forum: Yamaha SY77 Forum - Covers the Sy77 Keyboard and TG77 Module
Topic: SY77 and formatting MCD64 card
Replies: 7
Views: 322

Re: SY77 and formatting MCD64 card

I knew the SY99 could 'save card to disk' but never imagined that it could save from any card formatted by other synths :)

Brian
by shadowmask
Sun Dec 11, 2016 1:03 pm
Forum: Yamaha DX Forum
Topic: DX21 - Power Supply Problem
Replies: 21
Views: 695

Re: DX21 - Power Supply Problem

With that PSU being the switch-mode type the chances of getting a replacement transformer will be low (unless Yamaha have one). If the PSU cannot be salvaged then maybe it is better to look for a spare PSU from eBay, or source a suitable off-the-shelf multi rail PSU that can be made to fit inside th...
by shadowmask
Mon Dec 05, 2016 5:29 pm
Forum: Yamaha SY77 Forum - Covers the Sy77 Keyboard and TG77 Module
Topic: SY77 and formatting MCD64 card
Replies: 7
Views: 322

Re: SY77 and formatting MCD64 card

Great! Many thanks for trying this!

BTW - how are you reading the data out of the MCD card? My weapon of choice is this: https://sector101synth.wordpress.com/20 ... -test-rig/

Brian
by shadowmask
Mon Dec 05, 2016 5:28 pm
Forum: Yamaha DX Forum
Topic: DX21 - Power Supply Problem
Replies: 21
Views: 695

Re: DX21 - Power Supply Problem

Good luck with the fix :) Something I tend to do with old PCBs like that one (singled sided, no thru-holes) is to reflow all the joints. Thermal cycling can cause fractures in the joints in the hotter areas of the board and cause annoying intermittent faults. Mechanically stressed parts like the pow...
by shadowmask
Mon Dec 05, 2016 1:26 pm
Forum: Yamaha DX Forum
Topic: DX21 - Power Supply Problem
Replies: 21
Views: 695

Re: DX21 - Power Supply Problem

There is a service manual here: http://www.polynominal.com/yamaha-dx21/yamaha-dx21-service-manual.pdf On page 29 it shows the PSU circuit but does not give all the component references on the schematic. Also it fails to give all the descriptions as well. This page gives a hint: http://kaizerpowerele...

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