Search found 64 matches

by guus.assmann
Sun Aug 11, 2019 12:12 pm
Forum: CHAT FORUM
Topic: Credit card vs Debit cards on new webstore poll
Replies: 17
Views: 1885

Credit card vs Debit cards on new webstore poll

After reading this, I think I should explain the iDeal system that seems to be popular in my country. (Netherlands) If I place an order on a website, for payment I have to enter my bank name. The order-site connects to my bank of choice with the request to pay the amount. This opens a seperate windo...
by guus.assmann
Fri Aug 09, 2019 10:46 am
Forum: NEWS & ANNOUNCEMENTS
Topic: Future store updates planned (backend)
Replies: 95
Views: 9872

Re: Future store updates planned (backend)

Hello Exxos,

Maybe iDeal is an option?
I would welcome this, as I don't have (or want) a credit-card.

BR/
Guus
by guus.assmann
Tue Jul 16, 2019 8:03 am
Forum: 8 BIT CORNER
Topic: 27C400/27C800 EPROM emulator
Replies: 34
Views: 4994

27C400/27C800 EPROM emulator

Hello, As I'm the proud owner of quite some machines, I would be able to test some. I've got 8-bit Atari machines. Those would need an adapter, but that's not very difficult. (800XL and 130XE) And I have Mega ST boards. These are 68000 units. Maybe a TT would do? Although that contains 4 Roms. 68030...
by guus.assmann
Mon Jul 15, 2019 6:35 pm
Forum: 8 BIT CORNER
Topic: 27C400/27C800 EPROM emulator
Replies: 34
Views: 4994

27C400/27C800 EPROM emulator

Looks like a nice product and it's up to modern standards / sizes.
I'm very much interested in testing it.
What would be the cost and what parts are used?
I may have quite a bit of the parts in stock and do have soldering skills.

Keep up the good work please ! :D
by guus.assmann
Mon Mar 11, 2019 7:12 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

Re: TT Rom access speedup

No, I've not mounted that capacitor.
But it doesn't hurt.

BTW: It's possible to mount a switch in series with the grey cable.
This makes it possible to have the standard speed.
May be needed in some cases, altough I've not encountered that yet.

BR/
Guus
by guus.assmann
Mon Mar 11, 2019 6:26 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

TT Rom access speedup

Hello,

Here's a picture of the 2 diodes on pin 15 and 16.
The grey wire goes to the Eprom-CS at pin 22.
That's all there is to it.

BR/
Guus
by guus.assmann
Fri Mar 08, 2019 5:04 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

TT Rom access speedup

Just now I've also tested with the 1N5819 diodes. And that also works just fine. Then I removed the CF-cards so the TT would boot from floppy. Attached are the result files. Quite similar to the pictures in previous post. I've only looked at the Rom speed while I compared the before and after. The a...
by guus.assmann
Fri Mar 08, 2019 10:12 am
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

TT Rom access speedup

In a TT with Eproms, the OE line will be jumpered to GND, so OE is not used in the selection of the Eprom. And it does need CS to work. I have been looking at the data sheet of the 1N58189 but cannot find a recovery time. That may be an important factor. I have already had the TT not booting when I ...
by guus.assmann
Fri Mar 08, 2019 8:01 am
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

TT Rom access speedup

Hello, I am very sorry for the mixup I caused. I confused 28 pin and 32 pin devices. So it is indeed pin 24 that's the CE for the Eprom that I used. I'll try with 1N5819 diodes, hopefully today. As for the Gembench, I took the most recent version I could find. And next I'll try without any extra pro...
by guus.assmann
Thu Mar 07, 2019 5:41 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 3209

TT Rom access speedup

Hello Josh, The Eproms from ThunderStorm are fast enough, mine are 150nS. And 1N5819 should work, most important is the voltage drop. ( <0,8V) However, CS is pin 20 and not pin 22. Pin 22 is OE and that's permanently connected to GND trough one of the jumpers. I have not seen any slow Eproms yet. Bu...

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