New 2MB RAM upgrade for Amiga 500 & 500+

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22nd June 2018, 07:47
cmorley

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New 2MB RAM upgrade for Amiga 500 & 500+

Hello All,

I've just release my new 2MB trapdoor expansion for the Amiga 500 & Amiga 500+. It has a memory board and a Gary adapter (for extra address signals).

I own and have tested it in:
Amiga 500 Rev 3, 5 and 6A
Amiga 500+ Rev 8A

Confirmed works with:
Wicher 500i, 2MB MegAChip

Without the Gary adapter the board will act like a Commodore A501 or A501+. i.e. 0.5MB slow in an A500 and 1MB chip on an A500+. The Gary adapter is needed to access more of the memory.

It also has a socket for a Real Time Clock (RTC) & clock battery chip for Amiga 500. RTC is Epson 72421A (or 72421B less accurate and slightly cheaper) and battery is standard CR2032 coin cell. These are still manufactured and easy to obtain if you want one.

Please note:
A500: Kickstart 1.3 or later is required for the Gary adapter (it won't boot with 1.5MB slow RAM with Kick 1.2)
A500: A 1MB/ECS Agnus is needed to do the chip RAM mod (to get 1MB chip RAM & 1.5MB slow RAM)
A500+: Unless you do the chip RAM mod then you don't need/fit the Gary adapter
A500/A500+: For maximum memory you need to solder some jumper wires. Only attempt modification if you have the right tools and are confident in working on your Amiga.

Full details are on the website including installation instructions and chip RAM mod details.
http://www.boobip.com/hardware/A500_2MB

Please ask if you have any questions or an unusual setup.

Memory board, Gary adapter & link wire:
Attachment 136647

More photos on the website including pictures of it installed in A500 and A500+.

2MB memory PCB - £25
Gary Adapter and cable - £5
+ P&P from £2 UK, £4.15 EU, £4.80-£4.95 World

Current stock is blue PCBs.

Available elsewhere.

Chris
6th July 2018, 11:20
cmorley

2wk bump. Still some green boards left. New batch of blue 10+ available.
6th July 2018, 13:49
Ali500

I'd be interested in one of these for my A500+ pending some questions.

I'll send you a PM.
10th July 2018, 10:49
cmorley

Ali500: Payment received & KIT posted. Thanks!
10th July 2018, 14:54
bkodenkt

Pending questions regarding already existing 1MB Chip-RAM mod.

EDIT: Got my question answered by simply writing them down and thus thinking about them in detail.
31st July 2018, 11:32
cmorley

Bump. Still in stock.
20th August 2018, 10:53
cmorley

Bump. Still in stock. Only 2 green kits left though, plenty of blue.
30th August 2018, 22:01
WonkeyDonkey

What is C6 for ?

Thanks.
30th August 2018, 22:34
cmorley

Quote:

Originally Posted by WonkeyDonkey

What is C6 for ?

C6 is not used. Spare holes in case I needed bulk capacitance.

C7 is for A500 rev 3 compatibility.
30th August 2018, 22:41
WonkeyDonkey

Quote:

Originally Posted by cmorley

Quote:

Originally Posted by WonkeyDonkey

What is C6 for ?

C6 is not used. Spare holes in case I needed bulk capacitance.

C7 is for A500 rev 3 compatibility.

Thanks.

Declaring interest and sending PM.

(Nice to see the designer actively providing support on here, and the good level of documentation available).

;)
31st August 2018, 09:34
cmorley

WonkeyDonkey: Payment received and item posted. Thanks
31st August 2018, 14:37
kirk_m

I didn't buy mine here, but, can confirm it works nicely in my Rev6A with Wicher500i and 2MB megachip expansion. Chris was great with support in getting it to work with the Megachip + the Gary Adapter.
1st September 2018, 10:51
WonkeyDonkey

Received in the post this morning. Feedback left :)
15th September 2018, 19:39
cmorley

bump.
16th September 2018, 07:27
roc

Expressing interest in one full set (Expansion plus Gary adapter). If available, green but blue would be okay too.

PM Sent
16th September 2018, 10:13
roc

Quote:

Originally Posted by roc

Expressing interest in one full set (Expansion plus Gary adapter). If available, green but blue would be okay too.

PM Sent

Payment sent
16th September 2018, 11:16
cmorley

roc:
Payment received and item posted. Thanks
16th September 2018, 18:47
zJark

Hi.
I bought this from eBay last week. I have not received it yet, but couple of questions for future. I found old RM-550C from trapdoor of my a500. My plan is recycle ram and rtc chips. So can i use old RTC (OKI M6242B) in your board?
-Jarkki
16th September 2018, 19:04
cmorley

Quote:

Originally Posted by zJark

Hi.
So can i use old RTC (OKI M6242B) in your board?
-Jarkki

No, you need to use RTC72421A or RTC72421B which have an internal clock crystal. M6242B needs an external crystal and other components on the board as well. They are not compatible ICs.

RTC72421A is a little more accurate than RTC72421B.
16th September 2018, 20:03
zJark

Quote:

Originally Posted by cmorley

Quote:

Originally Posted by zJark

Hi.
So can i use old RTC (OKI M6242B) in your board?
-Jarkki

No, you need to use RTC72421A or RTC72421B which have an internal clock crystal. M6242B needs an external crystal and other components on the board as well. They are not compatible ICs.

RTC72421A is a little more accurate than RTC72421B.

Oh Ok. Thanks. Allmost forgot that another question. I have that stripped a500+ board in my a500. If i want that full 2meg i need to install missing ram chips and that logic chip in MB. I install sockets so it is easy change chips if something goes kaboom.
Ram chips in MB are hyb514256b-70 .... Now in that old trapdoor expansion i have hy51c4256s-10 chips. can i use them in my mb.
Quick googling tells me that difference is access time 70ns vs 100ns . Is that a problem?
-Jarkki
16th September 2018, 20:24
cmorley

You should be able to use the 100ns chips. They worked in the trapdoor expansion after all :)
16th September 2018, 21:03
ori1a

Can this extension somehow work as +1MB chip extension (1MB+1MB CHIP) without slow/ranger ram and without MB reworks?
16th September 2018, 21:54
cmorley

Quote:

Originally Posted by ori1a

Can this extension somehow work as +1MB chip extension (1MB+1MB CHIP) without slow/ranger ram and without MB reworks?

On an A500+ yes.
18th September 2018, 21:15
ori1a

Quote:

Originally Posted by cmorley

Quote:

Originally Posted by ori1a

Can this extension somehow work as +1MB chip extension (1MB+1MB CHIP) without slow/ranger ram and without MB reworks?

On an A500+ yes.

I'm interested in full set.

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka
18th September 2018, 22:07
cmorley

Quote:

Originally Posted by ori1a

Quote:

Originally Posted by cmorley

Quote:

Originally Posted by ori1a

Can this extension somehow work as +1MB chip extension (1MB+1MB CHIP) without slow/ranger ram and without MB reworks?

On an A500+ yes.

I'm interested in full set.

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka

If you have A500+ and do not want ranger RAM then you must not fit the Gary adapter. Memory card only on A500+ for 1MB + 1MB chip. Save £5 & don't buy the Gary adapter unless you want 2MB chip + 1MB slow on A500+.
19th September 2018, 06:33
ori1a

Payment for full setup sent.
Will start with chip mem.
I also have another (broken - chip mem error) A500+ and want try to use this extension mem as 2MB chip using gary:-)

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka
19th September 2018, 06:50
cmorley

ori1a: Payment received and item posted. Thanks

Quote:

I also have another (broken - chip mem error) A500+ and want try to use this extension mem as 2MB chip using gary
:smile:

Ahh OK. That isn't possible without special modification of the A500+. You'd need to disable RAS or CAS to the motherboard memory... easier to repair the fault I think!
4th October 2018, 14:46
ori1a

Card received and working.
Positive feedback left.
4th October 2018, 15:16
cmorley

Quote:

Originally Posted by ori1a

Card received and working.
Positive feedback left.

:thumbsup:
Good to hear. Feedback left. Thanks!
4th October 2018, 20:45
Epongette

Hi, declaring interest for 2MB memory PCB - £25 if any left
5th October 2018, 20:35
cmorley

Hi Epongette. Yes I have stock. I'll PM you.
6th October 2018, 14:28
Epongette

Quote:

Originally Posted by cmorley

Hi Epongette. Yes I have stock. I'll PM you.

Money sent, thanks
6th October 2018, 14:55
cmorley

epongette: Money received thanks. PM me with address details please :)
8th October 2018, 17:51
roc

Quote:

Originally Posted by roc

Quote:

Originally Posted by roc

Expressing interest in one full set (Expansion plus Gary adapter). If available, green but blue would be okay too.

PM Sent

Payment sent

The expansion has arrived and works like a champ on my A500+. Positive feedback released and thank you
8th October 2018, 18:08
cmorley

Quote:

Originally Posted by roc

The expansion has arrived and works like a champ on my A500+. Positive feedback released and thank you

That's great to hear, thanks. Feedback left.
9th October 2018, 10:15
Sotos

Interest in 2mb board and Gary adapter if still available?
9th October 2018, 15:38
cmorley

Hello Sotos. Yes I have stock of the blue boards. PM sent.
10th October 2018, 13:03
Sotos

Payment sent.
10th October 2018, 15:52
cmorley

Sotos: Payment received thanks. Item sent.
15th October 2018, 09:06
cvtof

Interest in 2mb board and Gary adapter if still available ?, to France.

thank you !
15th October 2018, 09:17
cmorley

cvtof: Yes I have stock. I will PM you.
15th October 2018, 11:10
cmorley

cvtof: Payment received, item posted. Many thanks!
4th December 2018, 14:27
ori1a

Quote:

Originally Posted by cmorley

Quote:

Originally Posted by ori1a

Card received and working.
Positive feedback left.

[emoji106]
Good to hear. Feedback left. Thanks!

Hi,
I am interested in one more card. This time without Gary adapter.

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka
4th December 2018, 15:38
cmorley

No problem I have stock. I will PM you.
4th December 2018, 19:49
ori1a

Quote:

Originally Posted by cmorley

No problem I have stock. I will PM you.

Payment done. PM replied.

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka
5th December 2018, 10:10
cmorley

ori1a: Payment received and item posted. Thanks
14th December 2018, 15:47
powaking

Inquiring if still in stock as I am declaring interest with Gary adapter.
14th December 2018, 16:18
cmorley

Quote:

Originally Posted by powaking

Inquiring if still in stock as I am declaring interest with Gary adapter.

Hi, yes I have stock of the memory board & the Gary adapter. I will PM you.
14th December 2018, 17:18
cmorley

powaking: Payment received and item posted. Thanks
18th December 2018, 21:21
ori1a

Safely arrived. Thanks.
( I will use it after Xmas.)

Wysłane z mojego ASUS_Z00AD przy użyciu Tapatalka

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