Plan<\/h2>\n\n\n\n
Photograph
Document
Teardown
Test Chips
Create PCB for ROMS
Clean PCB
Scan PCB
Retrace in KiCAD Schmentics
Rebiuld PCB<\/p>\n\n\n\n
<\/p>\n\n\n\n
If Chips are fired?<\/p>\n\n\n\n
PCB<\/h2>\n\n\n\nREV “G”<\/h3>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-20-1024x813.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-13-1024x535.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-17-1024x645.png\")
<\/figure>\n\n\n\nIntergrated Circuits<\/h2>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-6-1024x832.png\")
<\/figure>\n\n\n\nProcessor<\/h3>\n\n\n\n
U301 <\/strong>– Intel 8080A c1974<\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-8-1024x854.png\")
<\/figure>\n\n\n\nClock<\/h3>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-21-652x1024.png\")
<\/figure>\n\n\n\nClock Generation with U313 – DP8224 <\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-18-697x1024.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
Bus Controller<\/h3>\n\n\n\n
U302 ??? <\/strong>– Intel D8228 – System Controller and Bus Driver for 8080A CPU<\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-7.png\")
<\/figure>\n\n\n\nPeripheral Interface<\/h3>\n\n\n\n
U303 ??? –<\/strong> Intel P8255A c1981 – Programable perpheral Interface<\/p>\n\n\n\n24 Programmable I\/O Pins<\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-9.png\")
<\/figure>\n\n\n\nRAM<\/h3>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-23.png\")
<\/figure>\n\n\n\nU318 – Motorola MCM6810 – 128×8 Bit Random Access Memory
U31? – Motorola MCM6810 – 128×8 Bit Random Access Memory<\/p>\n\n\n\n
ROM<\/h3>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-22-1024x555.png\")
<\/figure>\n\n\n\nU304 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK
Marked
1156-87
98F4<\/p>\n\n\n\n
U305 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK
Marked
1156-88
8FC6<\/p>\n\n\n\nU306 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK<\/p>\n\n\n\nMarked
1156-90
?8191
??69<\/p>\n\n\n\n
EPROMS are going to need some work to read them being NMOS and Strange Pinout…. <\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-3.png\")
<\/figure>\n\n\n\nJL<\/strong> is Ceramic Package<\/p>\n\n\n\n45 <\/strong>is 450ns access time<\/p>\n\n\n\n<\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-11-1024x830.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-12-1024x697.png\")
<\/figure>\n\n\n\nRS232?<\/h3>\n\n\n\n
There is a baud select switch with “110” on it so this might be some sort of serial <\/p>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-19-1024x871.png\")
<\/figure>\n\n\n\nPin <\/p>\n\n\n\n
1 110 baud 1 + 2
2 75 baud
3 150 baud
4 300 baud
5 600 baud
6 1200 baud
7 2400 baud
8 4800 baud<\/p>\n\n\n\n
Missing Chips<\/h3>\n\n\n\n
U397 – <\/p>\n\n\n\n
Power Supply<\/h2>\n\n\n\n![\"\"](\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2022\/08\/image-24-1024x925.png\")
<\/figure>\n\n\n\nlooks like dual full bridge rectifiers with 4 regulators<\/p>\n","protected":false},"excerpt":{"rendered":"
Random ebay find from stoneagegaming. https:\/\/www.ebay.com.au\/str\/stoneagegaming Plan PhotographDocumentTeardown Test ChipsCreate PCB for ROMSClean PCBScan PCBRetrace in KiCAD SchmenticsRebiuld PCB If Chips are fired? PCB REV “G” Intergrated Circuits Processor U301 – Intel 8080A c1974 Clock Clock Generation with U313 – DP8224 Bus Controller U302 ??? – Intel D8228 – System Controller and Bus Driver for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188"}],"collection":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2188"}],"version-history":[{"count":39,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions"}],"predecessor-version":[{"id":2268,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions\/2268"}],"wp:attachment":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/figure>\n\n\n\n<\/figure>\n\n\n\n<\/figure>\n\n\n\nIntergrated Circuits<\/h2>\n\n\n\n<\/figure>\n\n\n\nProcessor<\/h3>\n\n\n\n
U301 <\/strong>– Intel 8080A c1974<\/p>\n\n\n\n<\/figure>\n\n\n\nClock<\/h3>\n\n\n\n<\/figure>\n\n\n\nClock Generation with U313 – DP8224 <\/p>\n\n\n\n<\/figure>\n\n\n\n<\/p>\n\n\n\n
Bus Controller<\/h3>\n\n\n\n
U302 ??? <\/strong>– Intel D8228 – System Controller and Bus Driver for 8080A CPU<\/p>\n\n\n\n<\/figure>\n\n\n\nPeripheral Interface<\/h3>\n\n\n\n
U303 ??? –<\/strong> Intel P8255A c1981 – Programable perpheral Interface<\/p>\n\n\n\n24 Programmable I\/O Pins<\/p>\n\n\n\n<\/figure>\n\n\n\nRAM<\/h3>\n\n\n\n<\/figure>\n\n\n\nU318 – Motorola MCM6810 – 128×8 Bit Random Access Memory
U31? – Motorola MCM6810 – 128×8 Bit Random Access Memory<\/p>\n\n\n\n
ROM<\/h3>\n\n\n\n<\/figure>\n\n\n\nU304 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK
Marked
1156-87
98F4<\/p>\n\n\n\n
U305 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK
Marked
1156-88
8FC6<\/p>\n\n\n\nU306 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK<\/p>\n\n\n\nMarked
1156-90
?8191
??69<\/p>\n\n\n\n
EPROMS are going to need some work to read them being NMOS and Strange Pinout…. <\/p>\n\n\n\n<\/figure>\n\n\n\nJL<\/strong> is Ceramic Package<\/p>\n\n\n\n45 <\/strong>is 450ns access time<\/p>\n\n\n\n<\/p>\n\n\n\n<\/figure>\n\n\n\n<\/figure>\n\n\n\nRS232?<\/h3>\n\n\n\n
There is a baud select switch with “110” on it so this might be some sort of serial <\/p>\n\n\n\n<\/figure>\n\n\n\nPin <\/p>\n\n\n\n
1 110 baud 1 + 2
2 75 baud
3 150 baud
4 300 baud
5 600 baud
6 1200 baud
7 2400 baud
8 4800 baud<\/p>\n\n\n\n
Missing Chips<\/h3>\n\n\n\n
U397 – <\/p>\n\n\n\n
Power Supply<\/h2>\n\n\n\n<\/figure>\n\n\n\nlooks like dual full bridge rectifiers with 4 regulators<\/p>\n","protected":false},"excerpt":{"rendered":"
Random ebay find from stoneagegaming. https:\/\/www.ebay.com.au\/str\/stoneagegaming Plan PhotographDocumentTeardown Test ChipsCreate PCB for ROMSClean PCBScan PCBRetrace in KiCAD SchmenticsRebiuld PCB If Chips are fired? PCB REV “G” Intergrated Circuits Processor U301 – Intel 8080A c1974 Clock Clock Generation with U313 – DP8224 Bus Controller U302 ??? – Intel D8228 – System Controller and Bus Driver for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188"}],"collection":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2188"}],"version-history":[{"count":39,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions"}],"predecessor-version":[{"id":2268,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions\/2268"}],"wp:attachment":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/figure>\n\n\n\nProcessor<\/h3>\n\n\n\n
U301 <\/strong>– Intel 8080A c1974<\/p>\n\n\n\n Clock Generation with U313 – DP8224 <\/p>\n\n\n\n <\/p>\n\n\n\n U302 ??? <\/strong>– Intel D8228 – System Controller and Bus Driver for 8080A CPU<\/p>\n\n\n\n U303 ??? –<\/strong> Intel P8255A c1981 – Programable perpheral Interface<\/p>\n\n\n\n 24 Programmable I\/O Pins<\/p>\n\n\n\n U318 – Motorola MCM6810 – 128×8 Bit Random Access Memory U304 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK U306 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK<\/p>\n\n\n\n Marked EPROMS are going to need some work to read them being NMOS and Strange Pinout…. <\/p>\n\n\n\n JL<\/strong> is Ceramic Package<\/p>\n\n\n\n 45 <\/strong>is 450ns access time<\/p>\n\n\n\n <\/p>\n\n\n\n There is a baud select switch with “110” on it so this might be some sort of serial <\/p>\n\n\n\n Pin <\/p>\n\n\n\n 1 110 baud 1 + 2 U397 – <\/p>\n\n\n\n looks like dual full bridge rectifiers with 4 regulators<\/p>\n","protected":false},"excerpt":{"rendered":" Random ebay find from stoneagegaming. https:\/\/www.ebay.com.au\/str\/stoneagegaming Plan PhotographDocumentTeardown Test ChipsCreate PCB for ROMSClean PCBScan PCBRetrace in KiCAD SchmenticsRebiuld PCB If Chips are fired? PCB REV “G” Intergrated Circuits Processor U301 – Intel 8080A c1974 Clock Clock Generation with U313 – DP8224 Bus Controller U302 ??? – Intel D8228 – System Controller and Bus Driver for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188"}],"collection":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2188"}],"version-history":[{"count":39,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions"}],"predecessor-version":[{"id":2268,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/2188\/revisions\/2268"}],"wp:attachment":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/figure>\n\n\n\nClock<\/h3>\n\n\n\n
<\/figure>\n\n\n\n<\/figure>\n\n\n\nBus Controller<\/h3>\n\n\n\n
<\/figure>\n\n\n\nPeripheral Interface<\/h3>\n\n\n\n
<\/figure>\n\n\n\nRAM<\/h3>\n\n\n\n
<\/figure>\n\n\n\n
U31? – Motorola MCM6810 – 128×8 Bit Random Access Memory<\/p>\n\n\n\nROM<\/h3>\n\n\n\n
<\/figure>\n\n\n\n
Marked
1156-87
98F4<\/p>\n\n\n\n
U305 <\/strong>– Texas Insterments TMS2708JL-45 – 1024 Word x 8 Bit uvEPROM in CERPAK
Marked
1156-88
8FC6<\/p>\n\n\n\n
1156-90
?8191
??69<\/p>\n\n\n\n<\/figure>\n\n\n\n<\/figure>\n\n\n\n<\/figure>\n\n\n\nRS232?<\/h3>\n\n\n\n
<\/figure>\n\n\n\n
2 75 baud
3 150 baud
4 300 baud
5 600 baud
6 1200 baud
7 2400 baud
8 4800 baud<\/p>\n\n\n\nMissing Chips<\/h3>\n\n\n\n
Power Supply<\/h2>\n\n\n\n
<\/figure>\n\n\n\n