wanted - ZS Scorpion 256/1024 Turbo PCB

[Павел Рябцов]

Павел Рябцов, новая тема появилась , тайминги пентагона на скорпе
https://zx-pk.ru/threads/30668-scorp...ajmingami.html

доработочку бы

Ну кто хочет тот и доработает) Я точно не буду этим заниматься.... платы уже сделаны, едут в Китай на склад.

[zx_]

Павел Рябцов, не, в смысле экспериментальную версию замутить

[Павел Рябцов]

Павел Рябцов, не, в смысле экспериментальную версию замутить

Тем более....

[Evgeny Muchkin]

Павел Рябцов, ну пажалуста.

[Gutten]

А если не экспериментальную плату с доработками, а отдельную платку для подключения проводками к материнке?

[Shockwav3]

I'm unsure about a few parts that need to be placed

VT10 = KT361G? (schematics mention a KT209, but the footprint is wrong)
VT9 = ???

Also, the diodes seem to have changed largely ... I assume no value means KS522, while there are some KS156 and KS168

[andreysur]

How to fit V10 KT209 (BC557) - look photo. V9 - KT361. Diodes KD522 (not KS). I think, KS168 instals only for protection purpose. You should use for assembling a diagram from that page https://zx-pk.ru/threads/30735-ispra...k-edition.html

[Shockwav3]

Are any fixes needed with D59?
Pin20 which should be VCC is connected to nothing as it seems.

[andreysur]

Yes, same fault on my PCB. There are many mistakes. Give me, please, more time, I'll try to find out, if someone has got working PCB.

[Shockwav3]

So far quite a lot of the machine is working for me.
I'm currently having troubles reading/writing real disks. From the Professional Monitor attempting to format a disk results in all sectors ending up as "bad" when checking (the computer hangs there for 1-2 minutes before proceeding to the next track). Disk select, motor and step controls work. The KR1818VG93 gets 11.8V under load (had to adjust the coil to 22uH), problems stay the same with a MB8877. The drive/disks has been used reliably with my Pentagon in the past.

Otherwise Video & sound output, bootup, professional monitor, SMUC, keyboard, etc. are working.