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Amiga computer related discussion => General chat about Amiga topics => Topic started by: Blizzard 128 MB on October 30, 2015, 11:27:39 PM
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Hello.
Amiga 500 rev. 6A 1 MB chipRAM + 0,5 or 1 MB fastRAM (trapdoor slot) possible? How?
I expanded an Amiga 500 rev. 6A 0,5 MB motherboard to 1 MB chipRAM with 8375 318069-16 Agnus (PAL system, max. 1 MB chipRAM). Original Agnus 8371 (max. 0,5 MB chipRAM).
http://s2.postimg.org/8o0x83w69/A500_6a_1_MBCHIP.png
My motherboard: http://amiga.resource.cx/photos/photos/a500rev6a-2.jpg
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can get 8mb + CF with Kipper2k board. Works with my 512K expansion in trap door on 6A board. I had to get the $5 adapter kit too. Also ended up ordering kickstart 3.1 rom from somewhere else so I can can use the CF card without a boot floppy. Luckily I still had my old 3x floppies.
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Hello.
Amiga 500 rev. 6A 1 MB chipRAM + 0,5 or 1 MB fastRAM (trapdoor slot) possible? How?
I believe one of the 2mb megachip boards allowed this, because it came with 2mb of chip ram. You didn't jumper gary differently, so the c00000 memory stayed where it was. Instead there was a wire that attached to gary and the megachip board dealt with the addressing.
But it's been many years since I had such a modified a500. IIRC I had 2mb chip + 1.5mb trapdoor.
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Hello.
Amiga 500 rev. 6A 1 MB chipRAM + 0,5 or 1 MB fastRAM (trapdoor slot) possible? How?
I expanded an Amiga 500 rev. 6A 0,5 MB motherboard to 1 MB chipRAM with 8375 318069-16 Agnus (PAL system, max. 1 MB chipRAM). Original Agnus 8371 (max. 0,5 MB chipRAM).
http://s2.postimg.org/8o0x83w69/A500_6a_1_MBCHIP.png
My motherboard: http://amiga.resource.cx/photos/photos/a500rev6a-2.jpg
That is a good question. I don't know the answer. It would be interesting to put an A501 or clone on your system to find out. One problem would be is this "fast" ram would be slow. As far a address space I think up to 1.8 megs of slow ram is "possible" on an amiga but would require some level of hacking or gary jumpering.
further I agree with Greyspirit true fast ram will be faster than trapdoor slow ram.
Or get an edge connector ram card of some sort with true "fast" ram.
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I saw all of the expansion here:
http://www.bigbookofamigahardware.com/bboah/CategoryList.aspx?id=28
A Gary adaptor and wire+GAL is needed for the all 1,5, 2, 4 MB trapdoor fastRAM expansion card.
Rev. 6 motherboard 1 MB chipRAM (1 MB Agnus) + 0,5 or 1 MB fastRAM possible with trapdoor card, but how?
A500+ rev. 8 motherboard with 2 MB Agnus = 2 MB chipRAM simple. 1 MB chipRAM on motherboard + 1 MB expansion card.
I use in 2010 a rev. 6 motherboard (0,5 MB chipRAM) machine + a 1 MB expansion card.
The result: 0,5 MB chipRAM and 0,5 MB fastRAM.
A500+ rev. 8 motherboard 1 MB chipRAM + 0,5 or 1 MB fastRAM how possible with trapdoor card?
The same may be the solution both motherboards.
1 MB chipRAM + 2 or 4 MB fastRAM possible with rev. 6, or rev. 8 motherboards?
Or 0,5 MB chipRAM + 2 or 4 MB fastRAM possible only with trapdoor card?
Example:
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1067
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1015
I connected the 0,5 MB fastRAM card to the trapdoor slot (1 MB chipRAM rev 6 motherboard), the fastRAM not exist.
The J7A jumper cut (0,5 to 1 MB operation) = trapdoor slot off.
I restored the J7A jumper to the original state, but the machine did not work.
I cut J7A, A500 work. The Gary wire necessary.
Without Gary wire 1 MB chipRAM + 0 MB fastRAM, or 0,5 MB chipRAM + 0,5 MB fastRAM possible only.
I do not want to buy a RAM expansion card, or rev. 8 motherboard. I want to use my rev. 6 1 MB chipRAM motherboard + 0,5 MB fastRAM only.
There may not be big disadvantage, if I expand the motherboard onto 1 MB.
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I do not want to buy a RAM expansion card, or rev. 8 motherboard. I want to use my rev. 6 1 MB chipRAM motherboard + 0,5 MB fastRAM only.
Why are you making this so hard on yourself? If you want to add more memory internally why not just buy one of these (http://www.kipper2k.com/a500fastmem.html)? 4MB + IDE support for $64 USD. Or 8MB for the princely sum of $74 USD. Since it connects directly to the processor this will be real fast ram (like through the side expansion slot), not that fake "slow-fast" ram. But it's your Miggy, do what you want.
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I do not want to buy a RAM expansion card, or rev. 8 motherboard. I want to use my rev. 6 1 MB chipRAM motherboard + 0,5 MB fastRAM only.
There may not be big disadvantage, if I expand the motherboard onto 1 MB.[/FONT]
I'm pretty sure that doing the standard rev 6 upgrade to 1mb will just stop the trapdoor ram from working. You can probably hack the motherboard and add extra logic that allows both sets of memory to be used, but I haven't heard of anyone ever doing that. So you'll be the first to figure it out.
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What about the Adram 540 and the Baseboard 4meg trapdoor products.
They both seen to have "solved" the chip and fast ram issue?
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What about the Adram 540 and the Baseboard 4meg trapdoor products.
They both seen to have "solved" the chip and fast ram issue?
Sure, he just needs to duplicate the extra logic found on the adapter board:
http://amiga.resource.cx/photos/photo2.pl?id=adram540&pg=1&res=hi&lang=en
ROFL. :roflmao:
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I am shopping only from Europe, I live in Europe.
I do not want to buy a RAM expansion card, or rev. 8 motherboard. I want to use my rev. 6 1 MB chipRAM motherboard + 0,5 MB fastRAM only.
A500+ rev. 8 motherboard 1 MB chipRAM + 0,5 or 1 MB fastRAM how possible with trapdoor card?
1 MB chipRAM + 2 or 4 MB fastRAM possible with rev. 6, or rev. 8 motherboards?
0,5 MB chipRAM + 2 or 4 MB fastRAM possible.
JP3 jumper on rev. 6 motherboard function?
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I'm pretty sure that doing the standard rev 6 upgrade to 1mb will just stop the trapdoor ram from working. You can probably hack the motherboard and add extra logic that allows both sets of memory to be used, but I haven't heard of anyone ever doing that. So you'll be the first to figure it out.
I did basically that, except I piggy backed the extra 512K on the chips on the motherboard because I didn't have a trapdoor expansion.
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I did basically that, except I piggy backed the extra 512K on the chips on the motherboard because I didn't have a trapdoor expansion.
What exactly did you do?
JP3 jumper on rev. 6 motherboard function?
[/B][/FONT]
https://ftp.fau.de/aminet/docs/hard/Trouble.txt
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Why are you making this so hard on yourself? If you want to add more memory internally why not just buy one of these (http://www.kipper2k.com/a500fastmem.html)? 4MB + IDE support for $64 USD. Or 8MB for the princely sum of $74 USD. Since it connects directly to the processor this will be real fast ram (like through the side expansion slot), not that fake "slow-fast" ram. But it's your Miggy, do what you want.
I think he just wants it as authentic as possible for it's time. Like me a bit, I still like my real hdd's. If he wants a modern true fast ram, then the kipper unit is ideal, so the choice is there if he wants it. This would make a 2mb chip plus 8mb fast m/c... Nice A500.
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I think he just wants it as authentic as possible for it's time.
Authentic for an a500 is 0.5mb chip ram.
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Complete, tested Amiga 500+PSU+mouse+disks on ebay.de 45-60 €.
46 €: http://www.ebay.de/itm/Commodore-Amiga-500-volle-Funktion-Top-/171965673114
A508IDE Fastmem with IDE 74 USD:
http://www.kipper2k.com/a500fastmem.html
Shipping to Europe 46 CAD = 35 USD. 74+35=109 USD = 102 €.
A508IDE price = 2×complete A500 config price???!! :shocked: Abnormal.
Shopping impossible.
Complete work A500 config + shipping from ebay.de = min. 70 €.
IDE+8MB expansion 102 €. But CPU = 68000 7 MHz, too slow.
Faster and better CPU 90 €, ACA500, but out of stock.
A508IDE + ACA500 not work simultaneously.
But chipRAM 0,5 MB, too little.
A500+ with 1 MB chipRAM 58 €:
http://www.ebay.de/itm/Amiga-Commodore-A-500-Plus-Altertuemchen-fuer-Sammler-und-Gamer-/121745340679
Ebay.de expansion prices too high.
Simple 0,5 MB trapdoor expansion 20-30 €, 1 MB to A500+ 69 €, etc.
Unreal.
1 MB 29 USD. http://www.kipper2k.com/a500chip.html
A500+ config min. 64 €.
http://www.ebay.de/itm/Commodore-Amiga-500-Plus-/121731739651
The complete A500+ configuration (A500+, KS 2.04, 8373 ECS Denise, 2 MB chipRAM (2 MB Agnus), RTC, 8 MB fastRAM, CFIDE, min. 25 MHz 68000 or 68010 CPU, PSU, mouse, 20-30 disks, 1084S monitor+RGB cable) which can be used well is too expensive, with shipping min. 200-250 €, and no PCMCIA, no AGA.
A1200 100 €, 030/28 MHz 8 MB CPU card 120 €, etc.
http://www.ebay.de/itm/Commodore-AMIGA-MTEC-T1230-28-RTC-Turbokarte-mit-8MB-fur-Amiga-1200-/201455297930
The expanded A500+ price = expanded A1200 price. A1200 = PCMCIA, internal IDE, AGA, etc.
The A500 expansion = meaningless.
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Happy I have Minimig and don't even think about these issues. Only wish the little one had 8MB Fast RAM on its snappy 68SEC000 :)
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Authentic for an a500 is 0.5mb chip ram.
Authentic for an expanded A500 of the time is what I meant, so only old expansions made whilst the A500 was still in production.
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I saw all of the expansion here:
http://www.bigbookofamigahardware.com/bboah/CategoryList.aspx?id=28
A Gary adaptor and wire+GAL is needed for the all 1,5, 2, 4 MB trapdoor fastRAM expansion card.
Rev. 6 motherboard 1 MB chipRAM (1 MB Agnus) + 0,5 or 1 MB fastRAM possible with trapdoor card, but how?
A500+ rev. 8 motherboard with 2 MB Agnus = 2 MB chipRAM simple. 1 MB chipRAM on motherboard + 1 MB expansion card.
I use in 2010 a rev. 6 motherboard (0,5 MB chipRAM) machine + a 1 MB expansion card.
The result: 0,5 MB chipRAM and 0,5 MB fastRAM.
A500+ rev. 8 motherboard 1 MB chipRAM + 0,5 or 1 MB fastRAM how possible with trapdoor card?
The same may be the solution both motherboards.
1 MB chipRAM + 2 or 4 MB fastRAM possible with rev. 6, or rev. 8 motherboards?
Or 0,5 MB chipRAM + 2 or 4 MB fastRAM possible only with trapdoor card?
Example:
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1067
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1015
I connected the 0,5 MB fastRAM card to the trapdoor slot (1 MB chipRAM rev 6 motherboard), the fastRAM not exist.
The J7A jumper cut (0,5 to 1 MB operation) = trapdoor slot off.
I restored the J7A jumper to the original state, but the machine did not work.
I cut J7A, A500 work. The Gary wire necessary.
Without Gary wire 1 MB chipRAM + 0 MB fastRAM, or 0,5 MB chipRAM + 0,5 MB fastRAM possible only.
I do not want to buy a RAM expansion card, or rev. 8 motherboard. I want to use my rev. 6 1 MB chipRAM motherboard + 0,5 MB fastRAM only.
There may not be big disadvantage, if I expand the motherboard onto 1 MB.
How to wire Gary? :confused: