ISO Laserjet I/II/III firmware

Charles charlesmorris800 at
Fri Aug 13 14:18:19 CDT 2021

On 8/13/21 7:00 PM, cctalk-request at wrote:
> Message: 1
> Date: Thu, 12 Aug 2021 13:10:43 -0400
> From: Ethan Dicks<ethan.dicks at>
> To: Al Kossow<aek at>,  "General Discussion: On-Topic and
> 	Off-Topic Posts"<cctalk at>
> Subject: Re: ISO Laserjet I/II/III firmware
> Message-ID:
> 	<CAALmimnjndcx5G0mPoP7sPb-c+Aocibms_RfCDQFW7aA5bPs3A at>
> Content-Type: text/plain; charset="UTF-8"
> On Thu, Aug 12, 2021 at 10:48 AM Al Kossow via cctalk
> <cctalk at>  wrote:
>> I suspect interest in emulating them will die out once they get past the 68000 models.
> I may still have a II, and I definitely still have at least one
> (functional) III and a 4Si
> I still use my 4M/L all the time - Postscript + LocalTalk + IEEE1284.
> It's a great little printer.
> -ethan

I have a IIp+ that I got for $2 at a hamfest around 15 years ago... I 
have repaired it several times (most recently, visibly bad electrolytics 
in the switching PS startup circuit). In fact that's the second time the 
power supply has failed - the first time was years ago and I just 
replaced the board. Now it's crinkling the bottom of pages... there used 
to be a kit to fix that.

I love those old "bricks". Although mine is like my grandfather's axe 
(new head and new handle but it's still my grandpa's axe) :)

The trick nowadays is finding toner cartridges that weren't just 
refilled, but actually rebuilt (with a new wiper blade).


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