/* Imported from Wayback Machine Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:g8pp:g8ppbase8085 Snapshot date: 2025-03-25 Generator : wayback-archiver */ ====== G8PPBase + 8085 ====== ===== Introduction ===== This is a two-board configuration consists of a [[builderpages:plasmo:g8pp:g8ppbase|G8PP in baseline configuration]] and a simple 8085 CPU board on RC2014 backplane. [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=2094a7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/dsc_41501231.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/dsc_41501231.jpg?600x399|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_dsc_41501231.jpg}}]] ===== 8085 CPU Card ===== [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=62c105&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/cpu8085_comp.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/cpu8085_comp.jpg?400x159|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_cpu8085_comp.jpg}}]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:cpu8085_scm.pdf|Schematic]] of PCB 8085 CPU card Gerber [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:cpu8085_r1.zip|photoplots]] of 8085 CPU card Engineering change of PCB 8085 CPU card A 1K pull-up resistor is required between X1 input and VCC so clock input swings from 0.8V (low) to 4.0V (high). At the solder side of PCB, install a 1/8 1K resistor between pin 1 (X1) and pin 40 (VCC) of 8085 ==== Prototype 8085 CPU Card ==== [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=64fb4b&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_comp.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_comp.jpg?250x110|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_8085_cpu_comp.jpg}}]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ff94e5&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_solder.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_solder.jpg?250x108|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_8085_cpu_solder.jpg}}]] This is a prototype of the 8085 CPU card. It is superseded by the PC board version. [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:8085_cpu_scm.pdf|Schematic]] of prototype 8085 CPU card ===== RC2014 Signal Definition ===== The following RC2014 signals are redefined for G8PPBase+8085 RC2014 Pin 19 (nM1) — ALE (8085 pin 30) RC2014 Pin 23 (nMREQ) — IOnM (8085 pin 34) RC2014 Pin 24 (nWR) — nWR (8085 pin 31) RC2014 Pin 25 (nRD) — nRD (8085 pin 32) RC2014 Pin 26 (nIORQ) — INTA (8085 pin 11) RC2014 Pin 37 (Spare 1) — HLD (8085 pin 39) RC2014 Pin 38 (Spare 2) — RDY (8085 pin 35) RC2014 Pin 39 (Spare 3) — TRAP (8085 pin 6) ===== G8PP Baseline Configuration ===== Introduction to [[builderpages:plasmo:g8pp|G8PP]] G8PP [[builderpages:plasmo:g8pp:g8ppbase|baseline configuration]] Altera [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8ppbase8085_cpld_1_8_19.zip|EPM7128SQC100 design for 8085]] ===== G8PPBase+8085 ===== [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp8085load_1_8_19.zip|Serial Bootstrap]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp8085mon_1_14_19.zip|8085 Monitor]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp_8085_cpm22all.zip|CP/M-2.2]] BIOS/CCP/BDOS CP/M 2.2 distribution files ===== Manuals and Instructions ===== Getting started with G8PPBase+8085 ←configure altera epm7128, load bootstrap, load 8085 monitor, load cp/m 8085 Monitor manual