Well I found another Prototype....iisi

[MrFahrenheit]

I don’t know if you’re posting old photos or not, but you need to immediately remove that Maxell battery. They are known to spontaneously explode, sometimes in peoples hands while removing them! I’ve heard of them exploding during shipping from a seller to a buyer.

On another note, did you manage to take a photo of the ROM SIMM in your prototype IIsi?

 

[jajan547]

I don’t know if you’re posting old photos or not, but you need to immediately remove that Maxell battery. They are known to spontaneously explode, sometimes in peoples hands while removing them! I’ve heard of them exploding during shipping from a seller to a buyer.

On another note, did you manage to take a photo of the ROM SIMM in your prototype IIsi?

I haven’t yet but I will later today looks to be normalish looking. Oh and that Maxwell has been removed and the board recapped. Power supply still smells like fish but those caps are on the way.

 

[Performa450]

Ah yeah, I saw this - you got it from the seller with the Spike PVT, right? I wasn’t sure it was a prototype from the pics, cool that it is and looking forward to more photos.

 

[jajan547]

Ah yeah, I saw this - you got it from the seller with the Spike PVT, right? I wasn’t sure it was a prototype from the pics, cool that it is and looking forward to more photos.

Yeah that guy had a ton, and yes it is a PVT but nothing crazy special sits like a late prototype with a weird EGRET, everything else seems mostly a standard.

 

[Trash80toHP_Mini]

On the PVT IIsi that you have that had a 25mhz CPU . . .

On that subject, I haven't seen you post the spec on its system Clock? Is it 40MHz in support of the full IIsi system as designed or 50MHz in order to support the faster CPU that happened to have been installed when assembled?

 

[jajan547]

On that subject, I haven't seen you post the spec on its system Clock? Is it 40MHz in support of the full IIsi system as designed or 50MHz in order to support the faster CPU that happened to have been installed when assembled?

Let me make a 7.5.5 BlueSCSI image and open TattleTech. I'll also post that ROM Picture for you @MrFahrenheit.

 

[jajan547]

Here's a Photo of a normal PDS adapter and the PVT adapter pay attention to the 343S1027's and the backs of the boards, I'll do some testing in a bit but the IIsi power supply is still not recapped and it's iffy sometimes it works sometimes it doesn't (YES CAPS are on the way). Also I added a photo of ROM Simm.

 

[Trash80toHP_Mini]

Let me make a 7.5.5 BlueSCSI image and open TattleTech.

Not necessary, if you take a pic or just read the legends printed on the crystal cans that's all needed. Is it a stock 40MHz can or a 50MHz can?

 

[Trash80toHP_Mini]

343S1027 Bus Transceivers are a bit interesting on both cards you have. My adapters have TI Logo'd (M) (c)Apple parts. Hadn't realized they were off the shelf Programmable Logic components? Curiouser and curiouser . . .

 

[jajan547]

Not necessary, if you take a pic or just read the legends printed on the crystal cans that's all needed. Is it a stock 40MHz can or a 50MHz can?

40MHz still strange though.

 

[Trash80toHP_Mini]

Not strange at all, you don't stop production because you're temporarily out of stock of a spec'd, less expensive CPU and you certainly don't hold up building a prototype, if you have a 25MHz part on hand that's what you use, works just fine at 20MHz.

LEM-Legend about the IIsi being planned as a 25MHz machine, then underclocked for marketing reasons was an errant conclusion jumped to from reports of successful overclockings and use of parts shared in common with the IIci.

Given the PDS/NuBus expansion flexibility if the IIsi and system clock rate dependency for NuBus Adapter's 10MHz clock, it's clear the IIsi was designed from the ground up as a 20MHz machine.

Shades of the RoadApple 6200 LEM-Legend.