Re: PDP-8 diagnostic tests

2016-08-24 Thread Toby Thain
On 2016-08-24 3:24 PM, Don North wrote: On 8/24/2016 2:21 AM, Pontus Pihlgren wrote: On Tue, Aug 23, 2016 at 12:31:42PM -0700, Scott Baker wrote: Hi, 1) DEC documentation which more fully describes all the instruction set (in more detail than the PDP-8 handbook) Not DEC documentation but a

Re: PDP-8 diagnostic tests

2016-08-24 Thread Don North
On 8/24/2016 2:21 AM, Pontus Pihlgren wrote: On Tue, Aug 23, 2016 at 12:31:42PM -0700, Scott Baker wrote: Hi, 1) DEC documentation which more fully describes all the instruction set (in more detail than the PDP-8 handbook) Not DEC documentation but a good resource:

Re: PDP-8 diagnostic tests

2016-08-24 Thread Doug Ingraham
Kudos for working on a VHDL model. Which 8 variant are you trying to model? As others have stated, the IAC does affect the link. Of the other instructions that one might think could change the Link, the ISZ instruction does not affect the link and indirection that uses the autoincrement memory

Re: PDP-8 diagnostic tests

2016-08-24 Thread Al Kossow
WHICH PDP-8? Every implementation was slightly different. Dig up the stuff written by Charles Lasner for the gory details. On 8/23/16 12:31 PM, Scott Baker wrote: > Hi, > > I have written a PDP-8 VHDL model and I have it running in an FPGA > https://github.com/scottlbaker/PDP8-SOC > >

Re: PDP-8 diagnostic tests

2016-08-24 Thread Don North
On 8/23/2016 12:31 PM, Scott Baker wrote: Hi, I have written a PDP-8 VHDL model and I have it running in an FPGA https://github.com/scottlbaker/PDP8-SOC At this time it has passed a basic DEC diagnostic instruction test but I found some interesting things when getting that instruction test to

PDP-8 diagnostic tests

2016-08-23 Thread Scott Baker
Hi, I have written a PDP-8 VHDL model and I have it running in an FPGA https://github.com/scottlbaker/PDP8-SOC At this time it has passed a basic DEC diagnostic instruction test but I found some interesting things when getting that instruction test to pass. For example: The following segment of