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multispeed accelerator maximum RAM
Posted by: kd2dhp on 2026-02-24 06:50:27 Has anyone ever tried filling it with 16mb SIMMs to bring their machine to 64mb? I know the archival website for the card says 16 meg is the max, but I can't imagine 16 meg SIMMS were common or cheap in 1991.
Posted by: Phipli on 2026-02-24 07:06:50 Has anyone ever tried filling it with 16mb SIMMs to bring their machine to 64mb? I know the archival website for the card says 16 meg is the max, but I can't imagine 16 meg SIMMS were common or cheap in 1991. Could you provide more information on what computer and what card? 16MB SIMMs were very expensive in 1991. On my SE, it is possible, but you can only use it as a RAM disk, not as System Memory.
Posted by: kd2dhp on 2026-02-24 07:12:18 Could you provide more information on what computer and what card? 16MB SIMMs were very expensive in 1991. Sorry, its a MicroMac Multispeed Accelerator with a 25MHz 030 going into an SE
Posted by: Phipli on 2026-02-24 07:14:53 Sorry, its a MicroMac Multispeed Accelerator with a 25MHz 030 going into an SE Probably no harm in giving it a go, but to be honest, even if it works, you're not going to be able to use more than 16MB of it, so I'd probably just use 4MB SIMMs.
Posted by: kd2dhp on 2026-02-24 07:19:20 Probably no harm in giving it a go, but to be honest, even if it works, you're not going to be able to use more than 16MB of it, so I'd probably just use 4MB SIMMs. Understood, thanks. I'll save my money and go with 4MB SIMMs, and maybe bring the accelerator up to 33MHz instead
Posted by: kd2dhp on 2026-02-24 07:54:50 Could you provide more information on what computer and what card? 16MB SIMMs were very expensive in 1991. On my SE, it is possible, but you can only use it as a RAM disk, not as System Memory. View attachment 95969 Wait, you got yours up to 40MHz?
Posted by: Phipli on 2026-02-24 08:02:28 Wait, you got yours up to 40MHz? Well, I got mine that 20MHz card to 50MHz, but it is a different card to yours, so your milage may vary. I didn't think I'd mentioned speed in this thread. Edit - Ah I see, yeah, that is a benchmark result on the desktop from one of my speed bump tests. I generally run that upgrade at 40MHz with 16MB RAM.
Posted by: applesos on 2026-02-24 09:39:25 Just to confirm since I'm curious- the accelerator itself has RAM slots? I have a Performer 030 in my SE and it would be very nice if this meant I now could put, say 4x 4Mb SIMMS in the existing RAM slots but that doesn't make any sense. Figured I'd ask.
Posted by: Phipli on 2026-02-24 09:44:59 Just to confirm since I'm curious- the accelerator itself has RAM slots? I have a Performer 030 in my SE and it would be very nice if this meant I now could put, say 4x 4Mb SIMMS in the existing RAM slots but that doesn't make any sense. Figured I'd ask. Yeah, their card looks like this (more slots on the other side): You won't have any luck with the built in slots, they're not wired for it for a start. There was a sister card to the Performa that had an optional plug in RAM board. The design is mostly the same, the main difference being the Performa removes the expansion options for SCSI, RAM and ethernet or video or whatever the third thing was for.
Posted by: adespoton on 2026-02-24 09:52:03 I used to have the equivalent one with the plug in RAM board for the Color Classic, PDS format. Like the Performa, it removed the expansion options for SCSI, Ethernet and video. Same general layout though.
Posted by: applesos on 2026-02-24 10:14:38 Yeah, their card looks like this (more slots on the other side): View attachment 95978 You won't have any luck with the built in slots, they're not wired for it for a start. There was a sister card to the Performa that had an optional plug in RAM board. The design is mostly the same, the main difference being the Performa removes the expansion options for SCSI, RAM and ethernet or video or whatever the third thing was for. Dang. I've only run into a few things where I didn't have enough RAM. It would be nice to run them on the SE but I have other machines for that.
Posted by: Phipli on 2026-02-24 10:38:49 Dang. I've only run into a few things where I didn't have enough RAM. It would be nice to run them on the SE but I have other machines for that. Yup, I've only tricked out my SE out of affection - it's my first Mac that I was given as a hand-me-down. I have an SE/30 I could use if I really wanted, but the SE has a special place in my heart.
Posted by: kd2dhp on 2026-02-26 10:31:53 Yup, I've only tricked out my SE out of affection - it's my first Mac that I was given as a hand-me-down. I have an SE/30 I could use if I really wanted, but the SE has a special place in my heart. I'm tricking mine out because I have limited desk space and I don't have an SE/30. I also happen to unexpectedly come into possession of this accelerator. I'm hoping it will outdo the Radius SE 16MHz 020 accelerator I have now, which doesn't have a RAM component
Posted by: Phipli on 2026-02-26 10:38:43 I'm tricking mine out because I have limited desk space and I don't have an SE/30. I also happen to unexpectedly come into possession of this accelerator. I'm hoping it will outdo the Radius SE 16MHz 020 accelerator I have now, which doesn't have a RAM component Yeah, the Radius cards are fast for what they are due to a good L2 cache, but a 25MHz card should be faster, especially with RAM onboard.
Posted by: kd2dhp on 2026-02-26 10:54:58 Yeah, the Radius cards are fast for what they are due to a good L2 cache, but a 25MHz card should be faster, especially with RAM onboard. I already have the parts on order to make my 25MHz card into a 33MHz one with math coprocessor
Posted by: Phipli on 2026-02-26 10:58:58 I already have the parts on order to make my 25MHz card into a 33MHz one with math coprocessor Excellent 🙂 What speed is the RAM in your card? Does it have anythink like an 8, 7 or a 6 written in the chips?
Posted by: kd2dhp on 2026-02-26 11:00:11 Excellent 🙂 What speed is the RAM in your card? Does it have anythink like an 8, 7 or a 6 written in the chips? 60ns
Posted by: Phipli on 2026-02-26 11:04:46 60ns Fancy, that's a out as fast as you usually find. Assuming it's like other cards that should be plenty fast enough.
Posted by: ObeyDaleks on 2026-02-26 13:16:33 I have one of these MicroMac MultiSpeed cards and I was able to bump it from 25MHz to 33Mhz. It refused to run at 40MHz. Never tried to go above 16MB of RAM. If I remember correctly, Speedometer clocked it at roughly twice the speed of an SE/30 (which makes sense at 33MHz).
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