profile
viewpoint
If you are wondering where the data of this site comes from, please visit https://api.github.com/users/virtualagc/events. GitMemory does not store any data, but only uses NGINX to cache data for a period of time. The idea behind GitMemory is simply to give users a better reading experience.

virtualagc/virtualagc 2083

Virtual Apollo Guidance Computer (AGC) software

virtualagc/agc_simulation 83

Verilog simulation files for a replica of the Apollo Guidance Computer

virtualagc/agc_hardware 71

Schematics and board layouts for an Apollo Guidance Computer replica

virtualagc/virtualagc.github.io 1

VirtualAgc website

startedvirtualagc/agc_simulation

started time in 35 minutes

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 226ce0dab5018739e8793d5cc421a5e39590e51b

Additional (now overwhelming) evidence presented that SOLARIUM 55 was used in Apollo 4.

view details

push time in a day

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 5930166808847c4ff583b3a106d55343ed61f6c8

Fixed a README typo.

view details

push time in a day

push eventvirtualagc/virtualagc

Ron Burkey

commit sha efa55952160fb905bd09798c52704b04987aab9a

Another 26 docs added to Document Library.

view details

push time in a day

push eventvirtualagc/virtualagc

Ron Burkey

commit sha b67ba02638deb761939bcdccc4a747518ddcc928

Corrected descriptions of AURORA 12 on Luminary and Document Library pages, to indicate that it's a fork of AURORA rather than true AURORA.

view details

push time in 2 days

startedvirtualagc/agc_simulation

started time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha d6c8b31510ad772f546da97820b3246e5fbf4123

And fixed the links for those images.

view details

push time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 606beb7bfbf1884a517160fc6f19e4118e3e0868

Oops! Forgot to add a couple of figures related to SUNSPOT.

view details

push time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha e0d9acfa703a7f368d654a5648e6e7c90c35b207

Updated discussion of SUNSPOT versioning and internal structure on the Colossus page.

view details

push time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha b4db58ff371013d328d77c20a416a51699ccaed9

Added the previously-overlooked Table 4-I from R-700 vol 3 to the figures at the tops of the Luminary and Colossus pages. Among other things, this table says that SOLARIUM 55 was used on both Apollo 4 and Apollo 6, so I've modified my previous speculations of that on the Colossus and Document Library pages to simple statements of fact. The Kondoizations of the Luminary and Colossus pages are now complete.

view details

push time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha ba4bb07c552cb65890889681a84aaf64eb28ed26

Finished friendlifying process for Luminary and Colossus pages.

view details

push time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

This paper mentions that CORONA was released in January 1966.

rburkey2005

comment created time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

And in E-1142 rev 47, August 15.1966. I think we have to admit that this really is CORONA 261.

Although at this point, I can see the error in my wishful thinking. Comparing the fixed-memory usage of CORONA 261 to what the preliminary tables in these documents are telling us about SOLARIUM, all the sections I've checked have changed. There is no large pool of unchanged memory sections. Admittedly, many of them may not have changed by much, but they've nevetheless changed somewhat.

By the way, I also see that SUNSPOT (Apollo 1), SUNDIAL, and AURORA fixed-memory allocations are beginning to be listed by this point. So I guess the SUNSPOT numbers could come in handy at some point.

rburkey2005

comment created time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

And indeed, the identical table is listed in E-1142 rev 46, July 15, 1966.

This July 15 document also lists the fixed-memory usage for "CORONA FLIGHT AS-501 AND AS-502", though those values obviously are not of much interest.

rburkey2005

comment created time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

I see as well that E-1142 rev 44 from May, exactly a month prior, lists the identical table of fixed-word usage. So if CORONA was changing, must not have changed much from May to June 1966.

rburkey2005

comment created time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

E-1142 unfortunately does not specify the CORONA revision number, but the document is from June 1966, and AS-202 was intended to launch in July 1966 (though it slipped to August), so the revision it lists might be 261.

While we don't have a list of CORONA ropes manufactured, I see that the 1969 document covering the K-START tape system, which apparently was used to store those core-rope images, does indeed list 261 as the unique CORONA release (as well as listing 69 as the unique SUNRISE release, by the way). So possibly (or not) that strengthens the case that E-1142 is discussing CORONA 261.

rburkey2005

comment created time in 3 days

issue commentvirtualagc/virtualagc

Reconstruction of CORONA 261

And there is this handy list of changes between AS-202 and AS-501: https://www.ibiblio.org/apollo/Documents/Programming%20Changes%20from%20AS-202%20to%20AS-501.pdf

rburkey2005

comment created time in 3 days

issue openedvirtualagc/virtualagc

Reconstruction of CORONA 261

I have no intention of trying to reconstruct CORONA 261 myself, particularly since we have no knowledge of its checksums as far as I know, but someone might want to. And if we ever get the long-awaited dump of its core modules, someone will want to decompile it and mix-and-match with SOLARIUM to recover the source code. At any rate, I thought there should be some place-holder for that, in which helpful resources could at least be taken note of.

Is see that in E1142-45, there's a table that lists all the log sections of CORONA, along with the number of words of fixed memory those sections use. At that point, it also seemed to believe that CORONA would be used for Apollo 4 and Apollo 6, implying that the differences between CORONA and SOLARIUM are likely very small. My thought is that if one had a list of the number of words of fixed memory each section of SOLARIUM 55 uses, one might find that most of the sections were unchanged in length, and hence might be unchanged.

created time in 3 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha f570f8c105c91ef67ec22339e18910be1c197218

More cleanups related to new Doc Library page. Includes: Adding a Block I section to the library, and simplification of the big table of software versions on the Luminary page.

view details

push time in 4 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 275bd473326ba9b914fc667da77ed3da807b175c

Various improving tweaks to the new Document Library page, including an explicit section for Block I.

view details

push time in 4 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 1f8396f2d352d092144b547dd763282e8f59633d

New document-library page now live and the old page now deprecated.

view details

push time in 5 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha bc4f2da554a26a79c5b0058c3b491c302cd72df4

Filled in lots of the "archived by" and "scanned by" fields of the document database. Lots more still to go.

view details

push time in 6 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha dddde4f8afd4d1dfabb421d4ea59cb07bfc5e1c0

Cleared the stack of new documents for the Document Library. However, for the present (and I hope, forever) I'm only updating the replacement Document Library page, rather than the original.

view details

push time in 6 days

startedvirtualagc/virtualagc

started time in 6 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 09bfada41a9257a99c031eb88d5f8cb77f47ba90

Reached the first-draft stage on the new document library page, in which the database is completely full of document and the new page is roughly on a par with the old one, section-wise, but in which a lot of checking and cleanup now needs to occur.

view details

push time in 7 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 2627d59097cf407f41cf65de6baa46499951cda1

Added code to detect duplicate database entries (by URL)

view details

push time in 7 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 6a74bd6e5f40f9fc902763c847673f6e1e773850

Added release info on AURORA, SUNDIAL to the Luminary and Colossus pages.

view details

Ron Burkey

commit sha 5a416c8247e11f81b4b44a34f16240de68919608

Lots more work on the reworking of the Document Library. It's getting really close.

view details

push time in 8 days

push eventvirtualagc/virtualagc

Ronald Burkey

commit sha 42c2282cacab82f0ff2c7bd2b067e6241f2a50d8

Update README.md Added documentation for statements about SUNDIAL assembly versioning.

view details

push time in 8 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha 4246f9476a8b1de0ddde727c92266c305a7f2e61

The assembly listings for FP6 and FP8 weren't in git, and weren't being tracked.

view details

push time in 9 days

push eventvirtualagc/virtualagc

Ron Burkey

commit sha a4deb6c00d8a577979d4fb50bf8eaa50123cc2cc

"Modern" PTC assembly listing hadn't been updated for some fixed typos in the source code.

view details

push time in 9 days