On Sun, Mar 21, 2021, 18:07 Rick Murphy via cctalk
wrote:
> The instruction that's waiting on the done bit to be set is overwritten
> with a NOP while the bootstrap is being read. This is common for
> bootstraps: minimal user-entered code that gets overwritten by the boot
> when it's being loade
On 3/21/2021 10:05 AM, Kyle Owen via cctalk wrote:
On Sun, Mar 21, 2021, 09:35 Rick Murphy via cctalk
wrote:
You have to read the bootstrap code in the TC0x driver to understand this.
I agree with your assessments, but I'm referring to the first stage
bootloader: either your toggle-in or MI8
> On Mar 21, 2021, at 2:28 PM, Paul Koning wrote:
>
>
>
>> On Mar 21, 2021, at 9:35 AM, Rick Murphy via cctalk
>> wrote:
>> ...
>> Trying again - my reply got chopped off for some reason.
>>
>> You have to read the bootstrap code in the TC0x driver to understand this.
>>
>> What happens
> On Mar 21, 2021, at 9:35 AM, Rick Murphy via cctalk
> wrote:
> ...
> Trying again - my reply got chopped off for some reason.
>
> You have to read the bootstrap code in the TC0x driver to understand this.
>
> What happens is that the code watches the buffer pointer (7755) and when it
> hi
On Sun, Mar 21, 2021, 09:35 Rick Murphy via cctalk
wrote:
>
> You have to read the bootstrap code in the TC0x driver to understand this.
>
I agree with your assessments, but I'm referring to the first stage
bootloader: either your toggle-in or MI8E-based ROM bootstrap. In the case
of that, the P
thanks, came through to ENDB here! great explanation!
bb
On Sun, Mar 21, 2021 at 9:35 AM Rick Murphy via cctalk
wrote:
>
> On 3/20/2021 8:51 PM, Kyle Owen via cctalk wrote:
> > On Sat, Mar 20, 2021 at 7:19 PM Kyle Owen wrote:
> >
> >> However, it appears as though word count will be hit by the l
On 3/20/2021 8:51 PM, Kyle Owen via cctalk wrote:
On Sat, Mar 20, 2021 at 7:19 PM Kyle Owen wrote:
However, it appears as though word count will be hit by the loading of the
first block. In fact, my instrumented version of SimH says it's overwritten
with a zero. If that's the case, it would se
On 3/20/2021 8:51 PM, Kyle Owen via cctalk wrote:
On Sat, Mar 20, 2021 at 7:19 PM Kyle Owen wrote:
However, it appears as though word count will be hit by the loading of the
first block. In fact, my instrumented version of SimH says it's overwritten
with a zero. If that's the case, it would se
On Sat, Mar 20, 2021 at 7:19 PM Kyle Owen wrote:
> However, it appears as though word count will be hit by the loading of the
> first block. In fact, my instrumented version of SimH says it's overwritten
> with a zero. If that's the case, it would seem as though the word count
> overflow flag wil
My understanding of the OS/8 TC08 bootloader (MI8-EC) is as follows:
0. Rewind tape
1. Set current address (07755) to 07600
2. Set word count (07754) to -0200
3. Read block 0 and wait for flag
4. Continue executing at 07600
However, it appears as though word count will be hit by the loading of the
10 matches
Mail list logo
