On Thu, Jun 9, 2016 at 6:34 AM, Jay West <jwest at classiccmp.org> wrote: Could that not be reverse-engineered from the boot code in e.g. Emulex UC17 ROMs? They could do TMSCP... BTW what PROM blower would folks recommend for creating/imaging M9312 ROMs? Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

I wrote... On Thu, Jun 9, 2016 at 6:34 AM, Jay West <jwest at classiccmp.org> wrote: To which mike replied... ---- Could that not be reverse-engineered from the boot code in e.g. Emulex UC17 ROMs? They could do TMSCP... BTW what PROM blower would folks recommend for creating/imaging M9312 ROMs? ---- Possibly, but some (me) are sticklers for original code. Plus, I am not sure, but I think someone said this rom did something really bizarre to fit in the available rom space - self modifying code or something... Data I/O 29B J

On Thu, Jun 9, 2016 at 12:27 PM, John Robertson <jrr at flippers.com> wrote: I kinda assumed it was a case of copying itself to RAM and self-modifying as it runs there - if it ever happened. Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

On 6/8/2016 3:13 PM, Mike Ross wrote: I have tried to compress/adapt the TMSCP boot in the PDP11 SIMH device driver, a bootstrap listing in a DEC tech manual, and using the programming concepts (hacks) in the MSCP DU M9312 boot prom 23-767A9, and have not been able to get a valid code image that fits in the PROM and has all the required functionality. So DEC must have taken some magic shortcut to get working TU boot code in the 23-E39A9 PROM. As to programming parts, I use an EETools TopMax programmer that I have had for years. It will do just about any of the older programmable devices. There are other programmers around (old DataIO's for example) that can do these bipolar PROMs. Also, M9312 boot PROMs are typically 82S131 (or equiv) 512x4 tristate devices, but only half the device is used; the other half of the device is never accessed on the M9312 and is just blank filled. An 82S129 (or equiv) 256x4 tristate device works just as well as a boot PROM as the upper address pin becomes an active low chip select, and this pin is pulled low on the M9312 board. -- Don North AK6DN Actually the page listed below is a big out of date with respect to some M9312 images (it is not an up to date mirror). The up to date page is at: http://ak6dn.dyndns.org/PDP-11/M9312/ Also note the 82S137/Am27S32/74S573 (1024x4-TS) device list applies to the CONSOLE PROMs, not the BOOT PROMs. On 6/8/2016 5:27 PM, John Robertson wrote: -- Don North AK6DN

On 6/8/2016 5:56 PM, Paul Koning wrote: In an M9312 boot PROM there are 49. words of bootstrap space that are available for code and data. Getting an MSCP boot to fit in that space required playing some tricks like treating some specially crafted instructions as data values (and vice versa). -- Don North AK6DN

On Wed, July 6, 2016 23:38, emanuel stiebler wrote: Ah, I'll try to contact him, thanks for the info. Ed -- Ik email, dus ik besta. BTC : 1J5fajt8ptyZ2V1YURj3YJZhe5j3fJVSHN LTC : LP2WuEmYPbpWUBqMFGJfdm7pdHEW7fKvDz

On Thu, July 7, 2016 00:48, Chuck Guzis wrote: Yes, I found out yesterday, seems the internal clock chip of my web/mail server gone bust during our vacation. Need to find a replacement machine. Ed -- Ik email, dus ik besta. BTC : 1J5fajt8ptyZ2V1YURj3YJZhe5j3fJVSHN LTC : LP2WuEmYPbpWUBqMFGJfdm7pdHEW7fKvDz