Problems burning Kickstart

[Zetr0]

Hiya Forum Chummies

I was hoping before I take a fiancial plunge as it was, i figure it might be best to ask for some confirming advice.

I need to backup my 3.1 roms and i believe that I need a pair of 27c400's to do this. all this is as writting in holy texts here.. well heres my problem i believe i may be suffering from a scair mongering, as a couple of colleages argue (and there was on monday i can say) that some toshiba 27c400 models are incompatible with what i want to use 'em for.

so figuring it all for a load of tosh (irony) i thought i would ask a finial opinion.

TOSHIBA TC574200D-10 27C400 16 Bit 40 Pin EPROM

these should work as Kickstart Roms 1200 right?

and just for arguments sake if one was so inclined with a little more electronics (namely a binary counter or NAND's) you could use just 1 of these chips if you had a board that plugged into both sockets?

cheers for your help guys...

[alexh]

Originally Posted by Zetr0

i believe that I need a pair of 27c400's to do this

One 27C400 for 16-bit Amiga's. Two 27c200's for 32-bit Amiga's.

You can use Two 27C400 on 32-bit Amiga's but half of the EPROM will never get used (under normal conditions).

a couple of colleages argue (and there was on monday i can say) that some toshiba 27c400 models are incompatible with what i want to use 'em for.

Sounds tosh. However I would get the datasheets for them. I've only ever used ST and AMD 27C400's.

TOSHIBA TC574200D-10 27C400 16 Bit 40 Pin EPROM these should work as Kickstart Roms 1200 right?

I think they should work. There is lots of chat on Usenet about these being 27c400 compatible

and just for arguments sake if one was so inclined with a little more electronics (namely a binary counter or NAND's) you could use just 1 of these chips if you had a board that plugged into both sockets?

The EPROMS are 16-bit and the Amiga 1200 is 32-bit. It accesses BOTH at the same time. You couldnt use just one.

What you could do is use Doobries Romsplit and Remus to create a 1Mbyte custom OS3.9 kickstart.

You could also add a switch to an upper address bit and have KS3.1 in the lower half and KS1.3 (A3000) in the upper half. All you would need would be a switch and maybe a resistor.

[Zetr0]

Thanks Alexh

thats really cleared a few thingys up

cheers indeedy!

[coze]

just for the record, I made a 1mb kickstart for A500+ with a 27C800. It works, however, it was kind of useless for me cause I couldn't find stuff to fill the upper half. workbench.library can be there, but it can also be loaded from disk so not much meaning. Also I found out the having a 1mb rom messes up stuff with accelerator boards whith maprom. Cause they expect and only map the first half. So actually maybe a 1 mb rom is more a nuisiance till some useful stuff to put there.

Alex's idea of making a kickstart switch quite interesting. I was thinking of something like that too...

[jimbo100]

Is this item ok for burning Amiga kickstart roms?

http://cgi.ebay.com.au/Dual-Powered-...QQcmdZViewItem

[Jope]

You need the 42pin adapter as well..

[jimbo100]

Originally Posted by Jope

You need the 42pin adapter as well..

Ok, is that also on that page? If so which number? And being a complete newbie at this can I ask why I need this adaptor?

[Jope]

The 16bit Kickstart ROM chips are physically larger and wider in bus size than can fit in the socket of the standard Willem prommer.

I couldn't see any 16bit/42pin adapters listed in the auctioneer's shop.

[lopos2000]

I bought my adapter from Sivava.com. Here is the link for the adapter --> Link. It's the B12 adapter

[Chain]

Im wondering why i can write 37.300 but not 40.63 (it IS burned correctly as verify says ok, but it isnt working in A500)
same willem, same adapter, 27c400 120ns chip

[Zetr0]

could it be a500 mobo revision ?

what rev you got ?

[narmi]

Have you tested the rom file with WinUAE? I have a few 40.63 roms from various sources, but I could only get one to work with my Kickflash. The bad roms didn't work with WinUAE either.

[Chain]

Its 6A board, im trying to burn 100% working dump of my own kick 3.1, which WORKS in same board.

There are two "microseconds" parameters in willem, is it important to set it on some values? Im using defautl settings (iirc 140/18 us)

or maybe its somethink to do with this (taken from datasheet):

Read Mode
The M27C400 has two organisations, Word-wide
and Byte-wide. The organisation is selected by the
signal level on the BYTEVPP pin. When BYTEVPP
is at VIH the Word-wide organisation is selected
and the Q15A–1 pin is used for Q15 Data Output.
When the BYTEVPP pin is at VIL the Byte-wide organisation
is selected and the Q15A–1 pin is used
for the Address Input A–1.


Programming

.....
The M27C400 is in the programming
mode when VPP input is at 12.5V, G is
at VIH and E is pulsed to VIL. The data to be programmed
is applied to 16 bits in parallel to the data
output pins. The levels required for the address
and data inputs are TTL. VCC is specified to be
6.25V ± 0.25V.

[Chain]

and yes, dumped rom works under uae

[Chain]

Darn, i had crappy dc adapter, voltage drop during burning proces was too high.

its working now, with 13.5v heavy psu from some printer (i think), wohoo!

time to play with Remus...

[vk4akp]

Hi guys! I too am about to embark on a journey into burning eproms for my amiga's and also a few TNC's I have here.

I bought a MCUmall True USB Willem Programmer which unfortunatly I am having troubles with.

Has anyone else experienced problems with this burner?

I have a brand new AMD AM2 64 Athlon 4000+ (Win XP Home) machine that I have just built. The USB works fine with a number of different devices, USB flash drive, Canon digital camera, Web cam, and so on.

But the MCUmall burner just comes up with R/W errors when ever I plug it in the software just says snyc error etc.

It will however work on an old P233MMX Laptop that I have here.

Very disapointing. I am about to pay another US$100 deposit to have a second unit sent out to test with. (Not a good situation) I am starting to think I should have delt with the `Real' Willem website.

Anyhow, can anyone offer information on the following?

- Eprom Part numbers suitable to use as Amiga Kickstarts.
- And speed requirements for these eproms on the different machines?
- Any good suppliers for these eproms?

I have A3000, A1000, A600HD, & A500 units.

I'd also be interested in a cheap solution to getting an IDE hard drive interfaced to the A500's I have. The AD-IDE was an excellent device, but too expensive these days.

TNX
.-.-.

[Zetr0]

@vk4akp

Hello there,

Welcome to the EAB, I am sure you will like it here, theres plenty of mischief to get up to.

I will quote Alexh

Originally Posted by alexh

One 27C400 for 16-bit Amiga's. A500/600/1000

Two 27c200's for 32-bit Amiga's. A1200

You can use Two 27C400 on 32-bit Amiga's but half of the EPROM will never get used (under normal conditions).

theres plenty of 27c200 / 400's on fleabay from time to time so have a lookie on ebay.co.uk most come from the states though.

if you don't mind a little re-wiring or building an interface board you probably could use a 27c100 or alternate from here

http://www.futurlec.com/Memory/27C010-45.shtml


Now IDE on an A500, hmmm theres some links on Aminet i may have a pack here on building your own... Aha! ... well kinda its build your own scsi... but its a start...

[vk4akp]

Hi, Thanks for the info.

Looks like 27c400 is the way to go.

You didn't mention speed requirements?

I notice 150ns ones are easy to come by but 100ns is difficult.

Any comments?

TNX
.-.-.

[Zetr0]

150's should be fine, its what I run here

[vk4akp]

OK Thanks.

Is 27c040 the same as 27c400 ?

.-.-.