![\"\"](\"https:\/\/i0.wp.com\/www.computer.etc.br\/site\/wp-content\/uploads\/sites\/7\/2021\/08\/IMG_20210822_012029504-1.jpg?resize=960%2C720\")
<\/figure><\/li>![\"\"](\"https:\/\/i0.wp.com\/www.computer.etc.br\/site\/wp-content\/uploads\/sites\/7\/2021\/08\/IMG_20210822_012049468-1.jpg?resize=960%2C720\")
<\/figure><\/li>![\"\"](\"https:\/\/i0.wp.com\/www.computer.etc.br\/site\/wp-content\/uploads\/sites\/7\/2021\/08\/IMG_20210828_120719747-1.jpg?resize=960%2C720\")
<\/figure><\/li><\/ul><\/figure>\n\n\n\nSome of the project requirements are:<\/p>\n\n\n\n
- Support for user and kernel priviledge modes, with up to 256 processes running in parallel.<\/li>
- Support for paged virtual memory, such that each process can have a total of 64KB RAM for itself.<\/li>
- Two serial ports (16550), a real time clock(M48T02), 2 parallel ports(8255), a programmable timer(8253), an IDE hard-drive interface(2.5 Inch HDD), and a soundboard(AY-3-8910).<\/li>
- The CPU supports 8 prioritized external interrupts, and a DMA channel.<\/li>
- The sequencer is microcoded, with 15 ROMS operating horizontally.<\/li>
- It has 401 instructions implemented, and up to 768 possible by using escape codes.<\/li>
- Support for 8\/16-Bit MUL and DIV instructions.<\/li>
- Fast indexed string instructions in the spirit of x86’s (REP) MOVSB, CMPSB, LODSB, STOSB, etc<\/li><\/ul>\n\n\n\n
REGISTER TABLE<\/h2>\n\n\n\n
General Purpose Registers<\/strong><\/td><\/tr> A<\/td> AH\/AL<\/td> Accumulator<\/td><\/tr> B<\/td> BH\/BL<\/td> Base Register (Secondary Counter Register)<\/td><\/tr> C<\/td> CH\/CL<\/td> Counter Register (Primary Counter)<\/td><\/tr> D<\/td> DH\/DL<\/td> Data Register \/ Data Pointer<\/td><\/tr> G<\/td> GH\/GL<\/td> General Register (For scratch)<\/td><\/tr> Special Purpose Registers<\/strong><\/td><\/tr> PC<\/td> –<\/td> Program Counter<\/td><\/tr> SP<\/td> –<\/td> Stack Pointer<\/td><\/tr> SSP<\/td> –<\/td> Supervisior Stack Pointer<\/td><\/tr> BP<\/td> –<\/td> Base Pointer (Used to manage stack frames)<\/td><\/tr> SI<\/td> –<\/td> Source Index (Source address for string operations)<\/td><\/tr> DI<\/td> –<\/td> Destination Index (Destination address for string operations)<\/td><\/tr> TDR<\/td> TDRH\/TDRL<\/td> Temporary Data Register<\/td><\/tr> PTB<\/td> –<\/td> Page Table Base<\/td><\/tr> MSW<\/td> Flags\/Status<\/td> Machine Status Word<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n CPU ARCHITECTURE<\/h2>\n\n\n\n
![\"\"](\"https:\/\/i0.wp.com\/www.computer.etc.br\/site\/wp-content\/uploads\/sites\/7\/2021\/08\/baffa-1_architecture_less.png?resize=960%2C540\")
Baffa-1 CPU Architecture<\/figcaption><\/figure><\/center>\n","protected":false},"excerpt":{"rendered":" The Baffa-1 was built from scratch using 74-Series logic gates and constructed using custom printed circuit boards. The main project has 221 chips and each peripheral board may have more 3 to 10 ICs! This website is connected to a Baffa-1 emulator running the original hardware Some of the project requirements are: Support for user […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-33","post","type-post","status-publish","format-standard","hentry"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/33","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/comments?post=33"}],"version-history":[{"count":9,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/33\/revisions"}],"predecessor-version":[{"id":198,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/33\/revisions\/198"}],"wp:attachment":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/media?parent=33"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/categories?post=33"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/tags?post=33"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}