Ohio Scientific port

.gitignore

@@ -26,3 +26,5 @@ neo6502.zip
 sorbus.zip
 nano6502.img
 nano6502_sysonly.img
+*.os5
+*.os8

README.md

@@ -63,6 +63,7 @@ No, it won't let you run 8080 programs on the 6502!
 <a href="doc/neo6502.png"><img src="doc/neo6502.png" style="width:40%" alt="CP/M-65 running on the Olimex neo6502"></a>
 <a href="doc/nano6502.png"><img src="doc/nano6502.png" style="width:40%" alt="CP/M-65 running on the nano6502"></a>
 <a href="doc/kim-1.png"><img src="doc/kim-1.png" style="width:40%" alt="CP/M-65 running on the KIM-1"></a>
+<a href="doc/osi.png"><img src="doc/osi.png" style="width:40%" alt="CP/M-65 running on the Ohio Scientific"></a>
 </div>
 
 
@@ -381,6 +382,23 @@ the same time.
 
   - If not, load the `bootiec-kim` or  `bootiec-pal` bootloader into 0x200 and execute it.
 
+### Ohio Scientific notes
+
+- Supported systems are:
+  - 400 series, with Model 440 32x32 video, Model 470 disk controller (5.25" or 8"), and an ASCII keyboard.
+  - 500 series, with Model 540 64x32 video, Model 505 disk controller (5.25" or 8"), and 542 polled keyboard.
+  - 600 series, with 64x16 video, on-board disk controller (5.25" or 8"), and polled keyboard.
+  - serial system, without video, Model 470 or 505 disk controller (8" only), and serial ACIA at $fc00.
+
+- All systems need at least 16kB of RAM, but detect up to 40kB with BASIC present, and 48kB if BASIC is replaced by RAM.
+  Some boot ROMs do not boot when BASIC is absent. For example, SYN600 relies on BASIC ROM routines to load the boot sector.
+- The generated disk images can be used directly with [osiemu](https://github.com/ivop/osiemu), or converted to HFE format with its `osi2hfe` if you want to create real floppies or use it with a Gotek on real hardware.
+[Thomas Buescher's WinOSI](http://vintagecomputers.square7.ch/Emulator.html) has a tool to convert HFE to 65D. His version of WinOSI only emulates 600 series machines.
+[Mark Spankus' version of WinOSI]( https://osi.marks-lab.com/index.php) can run them all.
+- All systems boot with a plain TTY driver. If you have a 540B graphics card with the optional color option enabled, you can load a screen driver called `TTY540B` (located on drive D: on MF systems).
+This is the only video configuration that has the posibility to draw a character and a cursor at the same screen location.
+On serial systems, you can load `SCRVT100` to enable the screen driver if you are connected with a VT100 terminal.
+
 ### Supported programs
 
 Commands include `DUMP`, `STAT`, `COPY`, `SUBMIT`, `ASM`, `QE` and `BEDIT` plus

build.py

@@ -26,6 +26,17 @@
         "atari800xlhd.atr": "src/arch/atari800+atari800xlhd_diskimage",
         "c64.d64": "src/arch/commodore+c64_diskimage",
         "neo6502.zip": "src/arch/neo6502+diskimage",
+        "osi400mf.os5": "src/arch/osi+osi400mf_diskimage",
+        "osi500mf.os5": "src/arch/osi+osi500mf_diskimage",
+        "osi600mf.os5": "src/arch/osi+osi600mf_diskimage",
+        "osimf-b.os5": "src/arch/osi+osimf-b_diskimage",
+        "osimf-c.os5": "src/arch/osi+osimf-c_diskimage",
+        "osimf-d.os5": "src/arch/osi+osimf-d_diskimage",
+        "osi400f.os8": "src/arch/osi+osi400f_diskimage",
+        "osi500f.os8": "src/arch/osi+osi500f_diskimage",
+        "osi600f.os8": "src/arch/osi+osi600f_diskimage",
+        "osif-b.os8": "src/arch/osi+osif-b_diskimage",
+        "osiserf.os8": "src/arch/osi+osiserf_diskimage",
         "pet4032.d64": "src/arch/commodore+pet4032_diskimage",
         "pet8032.d64": "src/arch/commodore+pet8032_diskimage",
         "pet8096.d64": "src/arch/commodore+pet8096_diskimage",

diskdefs

@@ -114,4 +114,26 @@ diskdef sdcard
     maxdir 1024
     boottrk 1
     os 2.2
-end
+end
+
+# 640 sectors = 80kB
+diskdef osi5
+    seclen 128
+    tracks 40
+    sectrk 16
+    blocksize 1024
+    maxdir 64
+    boottrk 1
+    os 2.2
+end
+
+# 1848 sectors = 231kB
+diskdef osi8
+    seclen 128
+    tracks 77
+    sectrk 24
+    blocksize 1024
+    maxdir 64
+    boottrk 1
+    os 2.2
+end

src/arch/osi/ascii.S

@@ -0,0 +1,65 @@
+; Ohio Scientific Instruments ASCII keyboard routines.
+; Copyright © 2024 by Ivo van Poorten
+; This file is licensed under the terms of the 2-clause BSD license. Please
+; see the COPYING file in the root project directory for the full text.
+
+ZEROPAGE
+
+cur_char:   .fill 1
+wait_cntr:  .fill 1
+last_char:  .fill 1
+
+KEYBD = $df01
+
+; ----------------------------------------------------------------------------
+
+    .section .text, "ax"
+
+scan_keyboard:
+
+    zloop
+        lda KEYBD
+
+        zif_mi
+            sta last_char
+            sta cur_char
+            ldx #2
+            stx wait_cntr
+            rts
+        zendif
+
+        cmp cur_char
+        zif_ne
+            sta cur_char
+            lda #2
+            sta wait_cntr
+            zcontinue
+        zendif
+
+        dec wait_cntr
+        zbreakif_eq
+
+        ldy #$10
+        zloop
+            ldx #$40
+            zloop
+                dex
+            zuntil_eq
+            dey
+        zuntil_eq
+    zendloop
+
+    ldx #$64                ; long delay on first character
+    cmp last_char
+    zif_eq
+        ldx #$0f                ; shorter repeat rate
+    zendif
+
+    stx wait_cntr
+    sta last_char
+
+    rts
+
+; ----------------------------------------------------------------------------
+
+; vim: filetype=asm sw=4 ts=4 et