amiga 4000 help please

[actung_bab]

hi finally got a cpu card and amiga psu so got my amiga 4000 mb working .

just few issues bear with me never had amiga 4000

it only has 1 meg chip ram l know this is first simm socket
what type ram can l use can be more than 2 megs

have l got fualt on the mb.

also with daughter board is it tope 3 slots l can use for amiga cards

many thanks

[jagoche]

A4000 does not support more than 2 megs of chip ram.

The sockets accepts 72 pin industry standard 32 or 36 bit page mode SIMMs. The four parity bits of the 36 bit modules are ignored and they function as simple 32 bit ones.

[Tumbleweed]

1 meg chip ram sounds odd. Check the chip ram jumper on the motherboard J213, the jumper should be set 1-2 for 2mb (2-3 is for 8 MB but it was never used).

[arnljot]

Check the jumper as said.
 
Also, only a 2mb module will register as 2mb. Anything else will register as 1mb, no matter what the jumper is set to.

[HyAmi]

arnljot wrote:
Check the jumper as said.
 
Also, only a 2mb module will register as 2mb. Anything else will register as 1mb, no matter what the jumper is set to.

I always believed only double sided simms with 2MB or more will be seen as 2MB Chipram. Incorrect?

[actung_bab]

thanks everone who replyed very helpfull as always
yes did check jumper is set to 1-2 meg
l have read where 8 meg thing was never but into use
l just try things to get it right thanks again
 :-D

[da9000]

arnljot wrote:
Also, only a 2mb module will register as 2mb. Anything else will register as 1mb, no matter what the jumper is set to.

I thought that wasn't the case either (I'm sure I stuck a 4MB or 8MB in there and with the right jumper setting it was seen as 2MB), Arnljot, but my memory fades :-/

Either way, you have a PGA 68882 FPU coming your way :-)

[Dandy]

arnljot wrote:

...
Also, only a 2mb module will register as 2mb. Anything else will register as 1mb, no matter what the jumper is set to.

Then please tell me why the 16mB module in my A4000 perfectly registers as 2 mB CHIP?

[Darrin]

actung_bab wrote:
thanks everone who replyed very helpfull as always
yes did check jumper is set to 1-2 meg
l have read where 8 meg thing was never but into use
l just try things to get it right thanks again
 :-D

Keep thrashing away at it.

I finally got my A4000 configured as I want it over the weekend so hopefully this will be the last time the case cover comes off (yeah right!).  :-)

http://i18.photobucket.com/albums/b134/darrin01311/A4000a.jpg

My last addition was to fit a CF card reader and a USB 2.0 port on the lower floppy drive bay cover for ease of access.

As is stands, the specs are as follows:
A4000 with GVP 68040 @ 40MHz
2MB Chip RAM, 16 MB Fast on mobo, 64MB on CPU card
CF card reader fitted to mobo IDE slot
Elbox IDE card in Zorro slot with:
     2 x 80GB hard drives (3 large SFS partitions each)
     CD ROM drive
Deneb USB 2.0 card in Zorro slot:
     internal port routed to front USB port
     Trendnet Ethernet dongle on rear for Internet
     USB DVD+-RW external drive
Cybervision 643D in Zorro slot:
     1024 x 768 display for Workbench & Internet
Internal Scan Doubler/Flicker Fixer
     Native & RTG displays routed to manual switch box
Emplant Apple Mac II card in Zorro slot:
     Haven't configured it yet, System 7 OS
PS2 mouse and keyboard adapters

I'm going to have to reinstall the OS as fitting the CD adapter has changed the main IDE adapter to SCSI2.device which causes the CD files system to throw a wobbler if the CF card is in place as it expects it to be SCSI.device.  With luck I can get AmiSys to work and give me a nice, pretty Workbench.
     

[Iggy_Drougge]

Tumbleweed wrote:
1 meg chip ram sounds odd.

I'm quite sure Commodore did ship some A4000 batches with 1 MB chip and 1 MB fast.

[stefcep2]

@ darrin

i was never able to get my A4000 to boot with a compact flash and a CDROM on the internal IDE.  It kept crashing.

I'd be interested in how you configured it to work.

[Lemmink]

As 2 MB modules are a little bit hard to get these days you can just put an 8 MB module in there. Make sure the chipram jumper is set to 8 MB to make the module is recognised as 2 MB ChipRAM otherwise it is only recognised as 1 MB.

[actung_bab]

awsome people good to know there are others who help out seems big task when you never had amiga 4000
yes l had cover of few times alright actually looks mess right know never seem get round to finishing puting all screw3s back in my cases ;-)

well had intresting week paid 200 nz to get amiga 4000 then it broke down after 30 mins (battery ACID) striped all down
only for my best freind whos got own electronics biz.
that its totaly knacked gone right trough eaten away tracks.
guy l brought from like only little bit leakage u can rub of with your finger (yeah right) oh well l learn one these days
anyways l got the cpu card (commdore 030 )no fpu and psu out this deal had no keyboard l brought that already.
so fitted to my mb l brought of ebay and ram from usa case from austrila taken me over year to gte all the parts.

least the bitza one works fine thanks guys begining to wonder why l bothered .

l typing this on the pc looks real nice having nice screen still like amiga though oh my best friend ex atrai and know pc fan so cant work why bother with amigas good qwestion
l just like them .

oh chap with 4000 with cf card sounds good setup mate
you put the effort in sounds like where l want be one day
thanks mate

 :-D

[arnljot]

@da9000
@HyAmi
@Dandy

Thanks da9000. Looking forward to it.

Now, on the RAM issue. I can´t say why it works for Dandy. But what I can say is that the manual states that the socket only accepts 1MB or 2MB modules. Also I´ve experienced the 1MB problem my self with a 4MB module in the ChipRAM socket.

Dandy, if the 16MB module works for you - good for you

Amiga.serveftp.net confirms that 4MB chips and 8MB chips can be used. So I dunno know what I did wrong with my 4MB module that worked as FAST, but not as Chip

[actung_bab]

well least l know thats not just me.
thats got that 1 meg thing, kind had me going what the
as so used to seeing 2 meg chip
with my amiga 1200s over the years thanks .
well you actually think u need the actually 2 meg simm myself
but having problem reading what diffrent sims are some have less actually chips on them so assume that like 1 meg or 2 meg simms

good point is l really like the 4000 it seems faster than standred 1200 thats for sure