IIgs 4meg RAM board

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For a friend to produce I built a 4Meg RAM card for the IIgs. Its been done before but I used 1Meg SIMMS to create the board. Actually it was pretty easy, I need to run RAM test to verify it works properly but it should.

Cheers,

Vince

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RAM board documents

I'll post documents for people once I have tested it out more. So far so good!

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Board Picture

Here's the picture I took of the RAM board in my GS:

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Board Pic

The pic link appears to be dead. No pic. Try again? (Dreaded RED X)

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RAM Board

Vince;

Does it look possible to develop a RAM board for the early
Apple II machines? IIe. //e /// //c //c+ ?
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Try this picture [url]http

Try this picture

http://home.comcast.net/~vbriel/gsboard.jpg

I can't edit my post, sorry.

Vince
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Actually, the early apple II

Actually, the early apple II and IIplus are my favorite Apples. Max memory the CPU can handle is 64K. The way they get around it is with a process most people are aware of called bank switching. It uses soft switches to bank in and out sections of memory. It's a very tedious and annoying problem and to develop large RAM boards would require 16K banks if I remember correctly. Possible but not probable.

Right now, I'm gonna dwell into a way to use DOS 3.3 with a hard drive, or at least, run DOS disk images from prodos with a II or II+ with 48K RAM. I want a bootable hard drive or compact flash card for the II/II+ as someday 5.25" diskettes will go away forever and we need a solid state media for these machines. Hard drives and compact flash cards are available but only for IIe and up.

Cheers,

Vince

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DOS 3.3

There's a several options for using DOS 3.3 other than 5.25" floppies. A Sider can do it though maybe they're running close to the end of thair lifespan. There's DOS3.3 launcher. The RamFactor card can be setup with DOS 3.3 partitions. There's also a couple of programs that'll let you format a 800k floppy as two 400k DOS 3.3 partitions.

Hard drives aren't really a problem for the II+, I have a Rev C in mine. Also if you install a 65C02 or accellerator then the Compact Flash will work in it too. I tried that but wanted a CD-ROM so I went back to my Rev C. A few years back I tried an Apple Hi-Speed SCSI card in the II+, it worked fine if DMA was turned off. I can't recall if I tried it in a II+ with a 6502 or only one with a 65C02.

Wayne

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DOS3.3 launcer requires 128K

DOS3.3 launcer requires 128K //e or better or it would be exactly what I want. Don't know much about the sider. IIRC Corvus HD's can do DOS partitions somehow but they are pretty rare. I read that the 65C02 option in the II+ doesn't always work with the CF card. I have plenty of 65C02's so I could try one. Also, I think there was a version of DOS for the focus drives called focus dos that was a modified version of DOS for the focus drives.

Vince
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been a while

I'm getting forgetfull, been a while since I've used DOS3.3 launcher.

Not all 65C02 will work in a II+. I had good luck with the Rockwell and GTE

Now that you mention it I do recall that there was a Focus DOS 3.3. I'd forgotten about it since i don't have a Focus drive. I had ramfasts when the Focus came out so I couldn't see a reason to buy a Focus.

Wayne

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Does you memory board get in

Does you memory board get in the way of any other cards? My Sirus Ram GS card is just a little bit too wide when my focus drive is next to it in slot 7 i kinda have to push the board to the side to fit them in.

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Well, I don't have a focus dr

Well, I don't have a focus drive (wish I did) but does the drive extend to the right of the board? I check clearance and if a board is in slot 7 and that long, clearance is ok but if the drive extends to the right of the edge of the focus board it may touch. You can't put the simm's on the right side of the board because of the clearance issue with the case. Check your focus and see if it sticks out to the right of the focus card at all.

Vince
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The focs drive is mounted on

The focs drive is mounted on the right side when installed.
______
|Drive |
Slot 7 --------------
|FOCUS CARD |
-------------

"Happiness in life is what is important"

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DOS 3.3 on HD (slightly OT)

Wayne: I have a Sider drive that is formatted with all the weird DOS 3.3., Pascal, CP/M and one ProDOS partion(s). The drive itself is in fine shape BUT! Sider drives came with a flaky power supply. The trick to getting them to live again is a bit of engineering; What you need to do is replace the p/s with a similar small one. Since all it is running is one (granted HUGE!) drive, the supply needs to only be in the 60 watt range. If you happen to have an old dead CMS or other clone SCSI drive from back in the day, these are usefull for this. Other good sources are external SCSI CD drives, and smaller PCs (Steer clear of PC Jrs; the p/s there stinks). You can use one from an LC Mac, but it takes some wiring. Basically what you look for is a power supply on a single board small enough to fit inside the case and replace the original. NOTE! some 20mb or smaller SCSI drives are workeable replacements for a Sider SASI.
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Re: DOS 3.3 on HD (slightly OT)

Bart, I don't have a problem with Sider power supplies, the problem is dead drives. Some years ago I picked up a number of dead ones from a former Sider dealer. Not having any replacement drives, I converted a couple to SCSI. I still have a few left that I'd love to find a replacement drive for. If you know of any drives that I could use as replacements, I'd love to hear about it.

Wayne

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Why 4 and not 8?

Feel free to abuse me if this is an obvious question, but since 8 meg is the maximum for a IIGS why build the card to take only 4? I ask since a new batch of these are available as of 8/26/2005.

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To build an 8 meg board

To build an 8 meg board you need to add extra logic and to keep it DMA compatible you need to add even more logic..

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As for the clearance issue, w

As for the clearance issue, would angled low-profile slots help?

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8 Meg RAM Board?

8 Meg RAM Board? Sounds like a GREAT idea. Wink (tinker, tinker - now where's that hammer?)

Until that day comes, visit www.gse-reactive.com for the 4 Meg RAM-4-GS boards. Now in stock and shipping!

Henry
www.gse-reactive.com