builderpages:plasmo:g8pp:g8ppbase68k8 [RetroBrew Computers Wiki]

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====== G8PPBase + 68K8 ======

===== Introduction =====

This is a two-board configuration consists of a [[:builderpages:plasmo:g8pp:g8ppbase|G8PP in baseline configuration]] and a simple MC68008 board on RC2014 backplane.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1e660d&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/g8ppbase68k8.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/g8ppbase68k8.jpg?direct&600x375|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp68k8_g8ppbase68k8.jpg}}]]

===== 68008 CPU Card =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp68k8:cpu68008_comp.jpg|{{:builderpages:plasmo:g8pp:g8pp68k8:cpu68008_comp.jpg?direct&400x184|cpu68008_comp.jpg}}]]

{{:builderpages:plasmo:g8pp:g8pp68k8:cpu68k8_scm.pdf|Schematic}}  of PCB 68008 CPU card

Gerber {{:builderpages:plasmo:g8pp:g8pp68k8:cpu68k8_r1.zip|photoplots}}  of 68008 CPU card

==== Prototype 68008 CPU Card ====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ee1b4a&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/68k8_cpu_comp.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/68k8_cpu_comp.jpg?direct&250x111|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp68k8_68k8_cpu_comp.jpg}}]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=70299b&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/68k8_cpu_solder.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp68k8/68k8_cpu_solder.jpg?direct&250x113|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp68k8_68k8_cpu_solder.jpg}}]]

This is a prototype of the 68008 CPU card. It is superseded by the PC board version.

{{:builderpages:plasmo:g8pp:g8pp68k8:68k8_scm.pdf|Schematic}}  of prototype 68008 CPU card

===== RC2014 Signal Definition =====

The following RC2014 signals are redefined for G8PPBase+68K8:

  * RC2014 Pin 19 (nM1) — A16 (68008 pin 16)
  * RC2014 Pin 23 (nMREQ) — nAS (68008 pin 28)
  * RC2014 Pin 24 (nWR) — RnW (68008 pin 30)
  * RC2014 Pin 25 (nRD) — A17 (68008 pin 17)
  * RC2014 Pin 26 (nIORQ) — A18 (68008 pin 18)
  * RC2014 Pin 37 (Spare 1) — nBR (68008 pin 33)
  * RC2014 Pin 38 (Spare 2) — nDTACK (68008 pin 31)
  * RC2014 Pin 39 (Spare 3) — A19 (68008 pin 19)

===== G8PP Baseline Configuration =====

Introduction to [[:builderpages:plasmo:g8pp|G8PP]]

G8PP [[:builderpages:plasmo:g8pp:g8ppbase|baseline configuration]]

Altera EPM7128SQC100 {{:builderpages:plasmo:g8pp:g8pp68k8:g8pp68k8_cpld_1_17_19.zip|design for 68K8}}

===== G8PPBase+68K8 =====

{{:builderpages:plasmo:g8pp:g8pp68k8:g68kload.zip|Serial Bootstrap}}, a bare minimum S record loader. It automatically jumps to 0x400 after a successful load. The serial communication is 38400, N81, no parity

{{:builderpages:plasmo:g8pp:g8pp68k8:g68kbug_buggy_1_17_19.zip|68K8 Monitor}}  <-still buggy, but good enough for file loading and memory display/mod

{{:builderpages:plasmo:g8pp:cpm68k_bios_ccp_bdos_write_1_17_19.zip|CP/M-68K}}, BIOS/CCP/BDOS for G8PPBase+68K8

CP/M68K distribution files

===== Manuals and Instructions =====

Getting started with G8PPBase+68K8 ←configure altera epm7128, load bootstrap, load z80 monitor, load cp/m

68K8 Monitor manual