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Add various other PC chips into the mix. #1209

Merged
merged 27 commits into from
Nov 22, 2023
Merged

Add various other PC chips into the mix. #1209

merged 27 commits into from
Nov 22, 2023

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TomHarte
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@TomHarte TomHarte commented Nov 17, 2023 •
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Lashes together enough of the PPI, DMA and PIT to get GLaBIOS to output via MDA its complete memory test and then fail only at the keyboard and FDC.

Likely next pull request: get some graphics output.

Specifically, the following text is the final set left in the MDA display area:

                                                                                
GLaBIOS [�] The hero we need but don't deserve                                  
(C) 2022-23 640KB Released under GPLv3                                          
                                                                                
Boot   [ COLD ]                                                                 
RAM    [ 640 KB OK ]            Video  [ Mono ]                                 
CPU    [ 8088 ]                 FPU    [ None ]                                 
LPT    [ None ]                 COM    [ None ]                                 
FDD    [ 0 ]                                                                    
                                                                                
POST Error 5000                                                                 
KB                                                                              
FDC                                                                             
                                                                                
Press the Any Key...                                                            
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
Ver: 0.2.5-8T 07/31/23

@TomHarte
Add XT roadmap.
afc0ca3
@TomHarte
Add link for future self.
a914495
@TomHarte
Start sketching the PIT.
2b69081
@TomHarte
Decode PIT mode writes.
56aa9d1
@TomHarte
Decode PIT mode writes.
af885cc
@TomHarte
Implementing counting for a couple of PIT modes.
05e93f0
@TomHarte
Take a caveman run at debugging.
a8f1c72
@TomHarte
Merge branch 'SupportChipsAplenty' of github.com:TomHarte/CLK into Su…
8844812 
…pportChipsAplenty
@TomHarte
Exit without further modification upon latch.
4e07770
@TomHarte
Fix field decoding.
119c83e
@TomHarte
Add enough of the DMA subsystem to trip over in PPI world.
55f466f
@TomHarte
Bring an 8255 into the mix.
7eed254
@TomHarte
Advance to the missing PIC.
a3066fc
@TomHarte
Relocate comment.
a689f2b
@TomHarte
Add a functionless PIC.
abf0eea
@TomHarte
Route traffic.
18ddc2c
@TomHarte
Capture some basics.
d3e90ce 
BIOS now seems to get as far as expecting channel 0 to trigger an interrupt, which never comes.
@TomHarte
Evict the PIT.
ee6012f
@TomHarte
Attempt to implement square-wave mode.
f0e2ef5
@TomHarte
PIT output now reaches the PIC.
695282b
@TomHarte
Edge towards but don't quite reach interrupt.
c4e9f75
@TomHarte
Prove to my caveman self that no text is being written.
058080f
@TomHarte
Add, disable, logging detritus.
931e6e7
@TomHarte
Handle low/high switches.
acdf32e
@TomHarte
Hack in some MDA text logging. Boot seems to complete?
83ca9b3
@TomHarte
Do some interrupt work.
a1e118a
@TomHarte
Pull out the PIC, DMA.
375a9f9
@TomHarte TomHarte marked this pull request as ready for review November 21, 2023 21:29
@TomHarte TomHarte merged commit c11d3b6 into master Nov 22, 2023
@TomHarte TomHarte deleted the SupportChipsAplenty branch November 22, 2023 02:53
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